Magnolia

Magnolia is a large genus of about 210 to 340[lower-alpha 1] flowering plant species in the subfamily Magnolioideae of the family Magnoliaceae. The natural range of Magnolia species is disjunct, with a main center in east and southeast Asia and a secondary center in eastern North America, Central America, the West Indies, and some species in South America.

Magnolia
Temporal range:
Magnolia sieboldii
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Magnoliaceae
Genus: Magnolia
L.
Type species
Magnolia virginiana
L.
Subgenera
  • Magnolia
  • Yulania
  • Gynopodium
Synonyms[1]
List
    • Alcimandra Dandy
    • Aromadendron Blume
    • Blumia Nees ex Blume
    • Buergeria Siebold & Zucc.
    • Champaca Adans.
    • Dugandiodendron Lozano
    • Elmerrillia Dandy
    • Guillimia Rchb.
    • Gwillimia Rottler ex DC.
    • Houpoea N.H.Xia & C.Y.Wu
    • Kmeria Dandy
    • Kobus Kaempf. ex Salisb.
    • Lassonia Buc'hoz
    • Lirianthe Spach
    • Liriopsis Spach
    • Manglietia Blume
    • Manglietiastrum Y.W.Law
    • Metamagnolia Sima & S.G.Lu
    • Michelia L.
    • Micheliopsis H.Keng
    • Oyama (Nakai) N.H.Xia & C.Y.Wu
    • Pachylarnax Dandy
    • Parakmeria Hu & W.C.Cheng
    • Paramagnolia Sima & S.G.Lu
    • Paramanglietia Hu & W.C.Cheng
    • Paramichelia Hu
    • Sampacca Kuntze
    • Santanderia Cespedes ex Triana & Planch.
    • Sinomanglietia Z.X.Yu
    • Sphenocarpus Wall.
    • Svenhedinia Urb.
    • Talauma A.Juss.
    • Tsoongiodendron Chun
    • Tulipastrum Spach
    • Woonyoungia Y.W.Law
    • Yulania Spach

Magnolia is an ancient genus that appeared before bees evolved, they are theorized to have evolved to encourage pollination by beetles instead.[2] Fossilized specimens of M. acuminata have been found dating to 20 million years ago, and fossils of plants identifiably belonging to the Magnoliaceae date to 95 million years ago.[3] Another aspect of Magnolia considered to represent an ancestral state is that the flower bud is enclosed in a bract rather than in sepals; the perianth parts are undifferentiated and called tepals rather than distinct sepals and petals. Magnolia shares the tepal characteristic with several other flowering plants near the base of the flowering plant lineage, such as Amborella and Nymphaea (as well as with many more recently derived plants, such as Lilium).

Description

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Mature magnolia fruit just starting to open, with a few seeds visible
An anatomical diagram of the flower of Magnolia biondii.
Magnolia seeds and fruit on a tree in northern Argentina

Magnolias are spreading evergreen or deciduous trees or shrubs characterised by large fragrant flowers, which may be bowl-shaped or star-shaped, in shades of white, pink, purple, green, or yellow. In deciduous species, the blooms often appear before the leaves in spring. Cone-like fruits are often produced in the autumn.[4]

As with all Magnoliaceae, the perianth is undifferentiated, with 9–15 tepals in three or more whorls. The flowers are hermaphroditic, with numerous adnate carpels and stamens arranged in a spiral fashion on the elongated receptacle. The flowers' carpels are extremely tough to avoid damage from pollinating beetles.[5]

The fruit dehisces along the dorsal sutures of the carpels. The pollen is monocolpate, and the embryonic development is of the Polygonum type.

Taxonomists, including James E. Dandy in 1927, have long had an interest in observing the fruits of Magnoliaceae and have often used the differences, or perceived differences, in fruit characters to justify systems for classification.[6]

Magnolia × soulangeana

Taxonomy

Early

Magnolia flowers in Wiesbaden, Germany

The name Magnolia first appeared in 1703 in the Genera[7] written by French botanist Charles Plumier (1646–1704), for a flowering tree from the island of Martinique (talauma). It was named after the French botanist Pierre Magnol. The English botanist William Sherard, who studied botany in Paris under Joseph Pitton de Tournefort, a pupil of Magnol, was most probably the first after Plumier to adopt the genus name Magnolia. He was at least responsible for the taxonomic part of Johann Jacob Dillenius's Hortus Elthamensis[8] and of Mark Catesby's Natural History of Carolina, Florida and the Bahama Islands.[9] These were the first works after Plumier's Genera that used the name Magnolia, this time for some species of flowering trees from temperate North America. The species that Plumier originally named Magnolia was later described as Annona dodecapetala by Lamarck,[10] and has since been named Magnolia plumieri and Talauma plumieri (among a number of other names), but is now known as Magnolia dodecapetala.[lower-alpha 2]

Carl Linnaeus, who was familiar with Plumier's Genera, adopted the genus name Magnolia in 1735 in his first edition of Systema Naturae, without a description but with a reference to Plumier's work. In 1753, he took up Plumier's Magnolia in the first edition of Species Plantarum. There he described a monotypic genus, with the sole species being Magnolia virginiana. Since Linnaeus never saw a herbarium specimen (if there ever was one) of Plumier's Magnolia and had only his description and a rather poor picture at hand, he must have taken it for the same plant that was described by Catesby in his 1730 Natural History of Carolina. He placed it in the synonymy of Magnolia virginiana var. fœtida, the taxon now known as Magnolia grandiflora. Under Magnolia virginiana, Linnaeus described five varieties (glauca, fœtida, grisea, tripetala, and acuminata). In the tenth edition of Systema Naturae (1759), he merged grisea with glauca and raised the four remaining varieties to species status.[lower-alpha 3]

By the end of the 18th century, botanists and plant hunters exploring Asia had begun to name and describe the Magnolia species from China and Japan. The first Asiatic species to be described by western botanists were Magnolia denudata, Magnolia liliiflora,[lower-alpha 4] Magnolia coco, and Magnolia figo.[lower-alpha 5] Soon after that, in 1794, Carl Peter Thunberg collected and described Magnolia obovata from Japan, and roughly at the same time, Magnolia kobus was also first collected.[11]

Recent

With the number of species increasing, the genus was divided into two subgenera, Magnolia and Yulania. Magnolia contains the American evergreen species M. grandiflora, which is of horticultural importance, especially in the southeastern United States, and M. virginiana, the type species. Yulania contains several deciduous Asiatic species, such as M. denudata and M. kobus, which have become horticulturally important in their own right and as parents in hybrids. Classified in Yulania is also the American deciduous M. acuminata (cucumber tree), which has recently attained greater status as the parent responsible for the yellow flower color in many new hybrids.

Relations in the family Magnoliaceae have puzzled taxonomists for a long time. Because the family is quite old and has survived many geological events (such as ice ages, mountain formation, and continental drift), its distribution has become scattered. Some species or groups of species have been isolated for a long time, while others could stay in close contact. To create divisions in the family (or even within the genus Magnolia) solely based upon morphological characters has proven to be a nearly impossible task.[lower-alpha 6]

By the end of the 20th century, DNA sequencing had become available as a method of large-scale research on phylogenetic relationships. Several studies, including studies on many species in the family Magnoliaceae, were carried out to investigate relationships.[12][13][14] What these studies all revealed was that the genus Michelia and Magnolia subgenus Yulania were far more closely allied to each other than either one of them was to Magnolia subgenus Magnolia. These phylogenetic studies were supported by morphological data.[15]

As nomenclature is supposed to reflect relationships, the situation with the species names in Michelia and Magnolia subgenus Yulania was undesirable. Taxonomically, three choices are available:

  1. to join Michelia and Yulania species in a common genus, not being Magnolia (for which the name Michelia has priority);
  2. to raise subgenus Yulania to generic rank, leaving Michelia names and subgenus Magnolia names untouched, or;
  3. to join Michelia with the genus Magnolia into the genus Magnolia s.l. (a big genus).

Magnolia subgenus Magnolia cannot be renamed because it contains M. virginiana, the type species of the genus and of the family.

Not many Michelia species have so far become horticulturally or economically important, apart from their wood. Both subgenus Magnolia and subgenus Yulania include species of major horticultural importance, and a change of name would be very undesirable for many people, especially in the horticultural branch. In Europe, Magnolia is even more or less a synonym for Yulania, since most of the cultivated species on this continent have Magnolia (Yulania) denudata as one of their parents. Most taxonomists who acknowledge close relations between Yulania and Michelia therefore support the third option and join Michelia with Magnolia.

The same goes, mutatis mutandis, for the (former) genera Talauma and Dugandiodendron, which are then placed in subgenus Magnolia, and genus Manglietia, which could be joined with subgenus Magnolia or may even earn the status of an extra subgenus. Elmerrillia seems to be closely related to Michelia and Yulania, in which case it will most likely be treated in the same way as Michelia is now. The precise nomenclatural status of small or monospecific genera like Kmeria, Parakmeria, Pachylarnax, Manglietiastrum, Aromadendron, Woonyoungia, Alcimandra, Paramichelia, and Tsoongiodendron remains uncertain. Taxonomists who merge Michelia into Magnolia tend to merge these small genera into Magnolia s.l. as well. Botanists do not yet agree on whether to recognize a big Magnolia or the different small genera. For example, Flora of China offers two choices: a large genus Magnolia, which includes about 300 species and everything in the Magnoliaceae except Liriodendron (tulip tree), or 16 different genera, some of them recently split out or re-recognized, each of which contains up to 50 species.[16] The western co-author favors the big genus Magnolia, whereas the Chinese recognize the different small genera.

Fossil record

Fossils assignable to Magnolia extend into the Paleogene, such as Magnolia nanningensis, named for mummified wood from the Oligocene of Guangxi, China, which has a close affinity to members of the modern secton Michelia.[17]

Subdivision

In 2012, the Magnolia Society published on its website a classification of the genus produced by Richard B. Figlar, based on a 2004 classification by Figlar and Hans Peter Nooteboom. Species of Magnolia were listed under three subgenera, 12 sections, and 13 subsections.[18][19] Subsequent molecular phylogenetic studies have led to some revisions of this system; for example, the subgenus Magnolia was found not to be monophyletic. A revised classification in 2020, based on a phylogenetic analysis of complete chloroplast genomes, abandoned subgenera and subsections, dividing Magnolia into 15 sections. The relationships among these sections are shown in the following cladogram, as is the paraphyletic status of subgenus Magnolia.[20]

Clade I

M. sect. Splendentes

M. sect. Talauma

M. sect. Gwillimia

Clade II
Clade A

M. sect. Tuliparia

M. sect. Macrophylla

Clade B

M. sect. Magnolia

M. sect. Oyama

M. sect. Rytidospermum 

M. sect. Manglietia

Clade C

M. sect. Kmeria

M. sect. Gynopodium

M. sect. Tulipastrum

M. sect. Yuliana

M. sect. Maingola

M. sect. Michelia

M. subg. Magnolia (not monophyletic)
M. subg. Gynopodium
M. subg. Yuliana

The table below compares the 2012 and 2020 classifications. (The exact circumscriptions of the corresponding taxa may not be the same.)

Comparison of two classifications of Magnolia
Figlar (2012)[18]Wang et al. (2020)[20]
SectionSubsectionSection
Talauma DugandiodendronSplendentes
Cubenses
TalaumaTalauma
Gwillimia GwillimiaGwillimia
Blumiana
AuriculataTuliparia
MacrophyllaMacrophylla
MagnoliaMagnolia
Rhytidospermum OyamaOyama
RhytidospermumRytidospermum
ManglietiaManglietia
KmeriaKmeria
GynopodiumGynopodium
Manglietiastrum
Yulania YulaniaYulania
TulipastrumTulipastrum
Michelia MaingolaMaingola
Aromadendron
MicheliaMichelia
Elmerrillia

Species

The species lists below are divided according to the Magnolia Society's 2012 classification.[18]

Subgenus Magnolia

Anthers open by splitting at the front facing the centre of the flower, deciduous or evergreen, flowers produced after the leaves.

Section Magnolia
Subsection Gwillimia
Subsection Blumiana
  • Magnolia angatensis Blanco (Philippines)
  • Magnolia betongensis (Craib) H.Keng (Borneo)
  • Magnolia gigantifolia (Miq.) Noot. (Borneo, Sumatra)
  • Magnolia hodgsonii (Hook.f. & Thom.) H.Keng (Nepal, Burma)
  • Magnolia lasia Noot. (Borneo)
  • Magnolia liliifera (L.) Baillon (SE Asia, Borneo, Philippines, Singapore, Sumatra)
    • Magnolia liliifera var. angatensis (Blanco) Noot. (Philippines)
    • Magnolia liliifera var. beccarii (Ridley) Noot. (Borneo)
    • Magnolia liliifera var. liliifera (SE Asia)
    • Magnolia liliifera var. obovata (Korth.) Govaerts (Borneo)
    • Magnolia liliifera var. singapurensis (Ridley) Noot. (Singapore, Sumatra)
  • Magnolia mariusjacobsia Noot. (Borneo)
  • Magnolia persuaveolens Dandy (Borneo)
    • Magnolia persuaveolens subsp. persuaveolens (Borneo)
    • Magnolia persuaveolens subsp. rigida Noot. (Borneo)
  • Magnolia rabaniana Hook.f. & Thomson D.C.S.Raju & M.P.Nayer (India)
  • Magnolia sarawakensis (Agostini) Noot. (Borneo)
  • Magnolia singapurensis (Ridl.) H.Keng (Singapore, Sumatra)
  • Magnolia villosa (Miq.) H.Keng (Sumatra, Borneo)
Subsection Talauma
Subsection Dugandiodendron
Subsection Cubenses
Section Manglietia
  • Magnolia aromatica (Dandy) V.S.Kumar (S China)
  • Magnolia blaoensis (Gagnep.) Dandy (Vietnam)
  • Magnolia blumei Prantl (Sumatra, Java)
    • Magnolia blumei var. blumei (Sumatra, Java)
    • Magnolia blumei var. sumatrana (Miq.) Figlar & Noot. (W Sumatra)
  • Magnolia calophylloides Figlar & Noot. (W Sumatra)
  • Magnolia caveana (Hook.f. & Thoms.) D.C.Raju & M.P.Nayer (Assam, N Burma)
  • Magnolia changhuntana Noot. (Guangdong (China))
  • Magnolia chevalieri (Dandy) V.S.Kumar (Vietnam, Laos)
  • Magnolia conifera (Dandy) V.S.Kumar (SE China, Vietnam)
    • Magnolia conifera var. chingii (Dandy) V.S.Kumar (SE China)
    • Magnolia conifera var. conifera (SE China, Vietnam)
  • Magnolia crassipes (Y.W.Law) V.S.Kumar (Guangdong (China))
  • Magnolia dandyi (Gapnep.) Dandy (S China, Vietnam, Laos)
  • Magnolia decidua (Q.Y.Zheng) V.S.Kumar (Jiangxi (China))
  • Magnolia duclouxii Finet & Gagnep. (Vietnam, SW China)
  • Magnolia figlarii V.S.Kumar (Sichuan (China))
  • Magnolia fordiana (Oliv.) Hu (Vietnam, S China)
    • Magnolia fordiana var. calcarea (X.H.Song) Chen & Noot. (Guizhou (China))
    • Magnolia fordiana var. fordiana (Vietnam, S China)
    • Magnolia fordiana var. forrestii (W.W.Sm. Ex Dandy) Chen & Noot. (SW China)
    • Magnolia fordiana var. kwangtungensis (Merr.) Chen & Noot. (SE China)
  • Magnolia garrettii (Craib) V.S.Kumar (SW China, Vietnam, Thailand)
  • Magnolia grandis (Hu & W.C.Cheng) V.S.Kumar (Yunnan (China))
  • Magnolia hongheensis (Y.M.Shui & W.H.Chen) V.S.Kumar (Yunnan (China))
  • Magnolia hookeri Cubitt & W.W.Sm. (SW China, N Burma, Thailand)
  • Magnolia insignis (Wall.) Blume (S China, Nepal, Burma)
  • Magnolia kwangtungensis Merr. (SE China)
  • Magnolia lanuginosoides Figlar & Noot. (Sumatra)
  • Magnolia longipedunculata (Q.W.Zeng & Law) V.S.Kumar (Guangdong (China))
  • Magnolia lucida (B.L. Chen & S.C. Yang) V.S. Kumar (SW China)
  • Magnolia obovalifolia (C.Y.Yu & Law) V.S.Kumar (Yunnan (China))
  • Magnolia ovoidea (H.T.Chang & B.L.Chen) V.S.Kumar (Yunnan (China))
  • Magnolia patungensis (Hu) Noot. (China)
  • Magnolia rufibarbata (Dandy) V.S. Kumar (Yunnan (China), Vietnam)
  • Magnolia sabahensis (Dandy ex Noot.) Figlar & Noot. (Borneo)
  • Magnolia sapaensis (N.H.Xia & Q.N.Vu) Grimshaw & Macer (Vietnam)
  • Magnolia utilis (Dandy) V.S.Kumar (N Burma, Thailand)
  • Magnolia ventii (N.V.Tiep) V.S.Kumar (Yunnan (China))
  • Magnolia xinganensis Noot. (Guangxi (China))
  • Magnolia yuyuanensis (Y.W.Law) V.S.Kumar (E China)
  • Magnolia zhengyiana (N.H.Xia) Noot. (Yunnan (China))
Section Kmeria
  • Magnolia duperreana Pierre (Vietnam, Cambodia)
  • Magnolia kwangsiensis Figlar & Noot. (Yunnan, Guangxi (China))
  • Magnolia thailandica Noot. & Chalermglin (Thailand)
Section Rhytidospermum
M. obovata
Subsection Rhytidospermum
M. wilsonii
Subsection Oyama
  • Magnolia globosa Hook. f. & Thoms. (Nepal, Burma)
  • Magnolia sieboldii K. Koch (Korea, E China, Japan)
    • Magnolia sieboldii subsp. japonica K.Ueda (Japan, central China)
    • Magnolia sieboldii subsp. sieboldii (Japan)
    • Magnolia sieboldii subsp. sinensis (Rehd. & Wilson) Spongberg (central China)
  • Magnolia wilsonii (Finet. & Gagnep.) Rehd. - Wilson's magnolia (SW China)
M. fraseri
Section Auriculata
  • Magnolia fraseri Walt. - Fraser magnolia or ear-leaved magnolia (SE US)
    • Magnolia fraseri var. fraseri - Fraser magnolia or ear-leaved magnolia (SE US)
    • Magnolia fraseri var. pyramidata (Bartram) Pampanini - pyramid magnolia (SE US)[lower-alpha 7]
M. macrophylla var. ashei flower in female phase
Section Macrophylla

Subgenus Yulania

Anthers open by splitting at the sides, deciduous, flowers mostly produced before leaves (except M. acuminata)

Section Yulania
M. liliiflora
Subsection Yulania
Subsection Tulipastrum
  • Magnolia acuminata (L.) L. (E North America)
    • Magnolia acuminata var. acuminata (E North America)
    • Magnolia acuminata var. subcordata (Spach) Dandy (SE US)
Section Michelia
Magnolia × alba
Subsection Michelia
  • Magnolia × alba (DC.) Figlar & Noot. (hybrid origin)
  • Magnolia angustioblonga (Law & Wu) Figlar (SW China)
  • Magnolia baillonii Pierre (SW China, Vietnam)
  • Magnolia balansae A.DC. (S China, Vietnam)
  • Magnolia banghamii (Noot.) Figlar & Noot. (Malaysia, Sumatra)
  • Magnolia braianensis (Gagnep.) Figlar (Vietnam)
  • Magnolia cavaleriei (Finet & Gagnep.) Figlar (S China)
  • Magnolia champaca (L.) Baillon ex Pierre (S India, Lesser Sunda isl., Java, Malay penn.)
    • Magnolia champaca var. champaca (S India, Lesser Sunda isl.)
    • Magnolia champaca var. pubinervia (Blume) Figlar & Noot. (Java, Malay penn.)
  • Magnolia chapensis (Dandy) Sima (S China, N Vietnam)
  • Magnolia citrata Noot. & Chalermglin (NE Thailand)
  • Magnolia compressa Maxim. (Japan, SW China)
  • Magnolia coriacea (H.T. Chang & B.L. Chen) Figlar (SE Yunnan (China))
  • Magnolia doltsopa (Buch.-Ham. Ex DC.) Figlar (SW China, Himalayas)
  • Magnolia elegantifolia Noot. (Zhejiang (China))
  • Magnolia ernestii Figlar. (Sichuan (China))
    • Magnolia ernestii subsp. ernestii (Sichuan (China))
    • Magnolia ernestii subsp. szechuanica (Dandy) Sima & Figlar (Sichuan (China))
  • Magnolia figo (Lour.) DC. (SE China)
    • Magnolia figo var. crassipes (Law) Figlar & Noot. (SE China)
    • Magnolia figo var. figo . (SE China)
    • Magnolia figo var. skinneriana ined. (SE China)
  • Magnolia flaviflora (Law & Wu) Figlar (Vietnam, SW China)
  • Magnolia floribunda (Finet & Gagnep.) Figlar. (S China, Vietnam)
  • Magnolia foveolata (Merr. Ex Dandy) Figlar (S China, Vietnam)
  • Magnolia fujianensis (Q.F.Zheng) Figlar (SE China)
  • Magnolia fulva (H.T. Chang & B.L. Chen) Figlar (Yunnan (China), Vietnam?)
    • Magnolia fulva var. calcicola Sima & Yu (Yunnan (China))
    • Magnolia fulva var. fulva . (Yunnan (China))
  • Magnolia gioi (A.Chevalier) Noot. (S China, Vietnam)
  • Magnolia guangdongensis (Y.H.Yan, Q.W.Zeng & F.W.Xing) Noot. (Guandong (China))
  • Magnolia guangxiensis (Law & R.Z.Zhou) Sima (Guangxi (China))
  • Magnolia hypolampra (Dandy) Figlar (S China, Vietnam)
  • Magnolia iteophylla (C.Y.Wu ex Y.W.Law & Y.F.Wu) Noot. (Yunnan (China))
  • Magnolia kingii (Dandy) Figlar (Bangladesh, Assam)
  • Magnolia kisopa (Bush.-Ham. ex DC.) Figlar (Vietnam, Nepal)
  • Magnolia koordersiana (Noot.) Figlar (Malaysia, W Sumatra)
  • Magnolia lacei (W.W.Smith) Figlar (SW China, Vietnam)
  • Magnolia laevifolia (Law & Y.F.Wu) Noot. (Yunnan (China))
  • Magnolia lanuginosa (Wall.) Figlar & Noot. (Yunnan (China), Nepal)
  • Magnolia leveilleana (Dandy) Figlar (SW China)
  • Magnolia macclurei (Dandy) Figlar (S China, N Vietnam)
    • Magnolia macclurei var. macclurei. (S China, N Vietnam)
    • Magnolia macclurei var. sublanea Dandy (Guangdong (China))
  • Magnolia mannii (King) King (Assam)
  • Magnolia martinii H.Lev. (SE China, Vietnam)
  • Magnolia masticata (Dandy) Figlar (Yunnan (China), Laos)
  • Magnolia maudiae (Dunn) Figlar (SE China, Hainan isl.)
    • Magnolia maudiae var. hunanensis (C.L.Peng & L.H.Yan) Sima (Hunan (China))
    • Magnolia maudiae var. maudiae (SE China, Hainan Isl.)
    • Magnolia maudiae var. platypetala (Hand.-Mazz.) Sima (s.central China)
  • Magnolia mediocris (Dandy) Figlar (S China, Vietnam)
  • Magnolia microcarpa (B.L.Chen & S.C.Yang) Sima (S China)
  • Magnolia microtricha (Hand.-Mazz.) Figlar. (Yunnan (China))
  • Magnolia montana (Blume) Figlar & Noot. (Malaysia to Borneo)
  • Magnolia nilagirica (Zenker) Figlar (S India, Sri Lanka)
  • Magnolia oblonga (Wall. Ex Hook.f. & Thomson) Figlar. (Assam)
  • Magnolia odora (Chun) Figlar & Noot. (SE China, N Vietnam)
  • Magnolia opipara (H.T.Chang & B.L.Chen) Sima (Yunnan (China))
  • Magnolia philippinensis P.Pharm (Philippines)
  • Magnolia punduana (Hook.f. & Thoms.) Figlar (Assam)
  • Magnolia rajaniana (Craib.) Figlar. (Thailand)
  • Magnolia scortechinii (King) Figlar & Noot. (Malay penn., W Sumatra)
  • Magnolia shiluensis (Chun & Y.F.Wu) Figlar (Hainan isl.)
  • Magnolia sirindhorniae Noot. & Chalermglin (Thailand)
  • Magnolia sphaerantha (C.Y.Wu ex Z.S.Yue) Sima (SW China)
  • Magnolia subulifera (Dandy) Figlar (Vietnam)
  • Magnolia sumatrae (Dandy) Figlar & Noot. (Malaysia, Sumatra)
  • Magnolia xanthantha (C.Y.Wu ex Law & Y.F.Wu) Figlar (Yunnan (China))
Subsection Elmerrillia
  • Magnolia platyphylla (Merr.) Figlar & Noot. (Philippines)[22]
  • Magnolia pubescens (Merr.) Figlar & Noot. (Philippines)[23]
  • Magnolia sulawesiana Brambach, Noot. & Culmsee (Sulawesi)[24]
  • Magnolia tsiampacca (L.) Figlar & Noot. (Sumatra, Borneo, Sulawesi, Moluccas, New Guinea, Bismarck Archipelago)[25]
    • Magnolia tsiampacca subsp. mollis (Dandy) Figlar & Noot. (Sumatra, Borneo)[26]
    • Magnolia tsiampacca subsp. tsiampacca (Sulawesi, Moluccas, New Guinea, Bismarck Archipelago)[27]
      • Magnolia tsiampacca subsp. tsiampacca var. glaberrima (Dandy) Figlar & Noot. (New Guinea)[28]
      • Magnolia tsiampacca subsp. tsiampacca var. tsiampacca (Sulawesi, Moluccas, New Guinea, Bismarck Archipelago)
  • Magnolia vrieseana (Miq.) Baill. ex Pierre (Sulawesi, Moluccas)[29]
Subsection Maingola
  • Magnolia annamensis Dandy (Vietnam)
  • Magnolia carsonii Dandy ex Noot. (Borneo, Celebes)
    • Magnolia carsonii var. carsonii (Borneo)
    • Magnolia carsonii var. drymifolia Noot. (Borneo)
    • Magnolia carsonii var. phaulanta (Dandy ex Noot.) S.Kim (Celebes)
  • Magnolia cathcartii (Hook.f. & Thoms.) Noot. (SW China, Burma)
  • Magnolia griffithii King (India, Assam)
  • Magnolia gustavii King (India, Assam)
  • Magnolia macklottii (Korth.) Dandy (W Java, Borneo, Sumatra)
    • Magnolia macklottii var. beccariana (Agostini) Noot. (Sumatra)
    • Magnolia macklottii var. macklottii (W Java, Borneo)
  • Magnolia pealiana King (Assam)
Subsection Aromadendron
  • Magnolia ashtonii Dandy ex. Noot. (Sumatra, Borneo)
  • Magnolia bintuluensis (Agostini) Noot. (Sumatra, Borneo)
  • Magnolia borneensis Noot. (Borneo, Philippines)
  • Magnolia elegans (Blume) Keng (Sumatra, Java)
  • Magnolia pahangensis Noot. (Borneo, Philippines)
Section Gynopodium
Section Manglietiastrum

Uses

Flowering Magnolia figo 'Purple Queen'

Horticultural uses

Star magnolia from botanical gardens, Halifax, Nova Scotia
Star magnolia from botanical gardens, Halifax, Nova Scotia

In general, the genus Magnolia has attracted horticultural interest. Some, such as the shrub M. stellata (star magnolia) and the tree M. × soulangeana (saucer magnolia) flower quite early in the spring, before the leaves open. Others flower in late spring or early summer, including M. virginiana (sweetbay magnolia) and M. grandiflora (southern magnolia). The shape of these flowers lend themselves to the common name tulip tree that is sometimes applied to some Magnolia species.[lower-alpha 9]

Hybridisation has been immensely successful in combining the best aspects of different species to give plants which flower at an earlier age than the parent species, as well as having more impressive flowers. One of the most popular garden magnolias, M. × soulangeana, is a hybrid of M. liliiflora and M. denudata.

In the eastern United States, five native species are frequently in cultivation: M. acuminata (as a shade tree), M. grandiflora, M. virginiana, M. tripetala, and M. macrophylla. The last two species must be planted where high winds are not a frequent problem because of the large size of their leaves.

Culinary uses

The flowers of many species are considered edible. In parts of England, the petals of M. grandiflora are pickled and used as a spicy condiment. In some Asian cuisines, the buds are pickled and used to flavor rice and scent tea. In Japan, the young leaves and flower buds of Magnolia hypoleuca are broiled and eaten as a vegetable. Older leaves are made into a powder and used as seasoning; dried, whole leaves are placed on a charcoal brazier and filled with miso, leeks, daikon, and shiitake, and broiled. There is a type of miso which is seasoned with magnolia, hoba miso.[35][36]

Traditional medicine

Magnolia tree in full bloom
Magnolia tree in Kenosha
Magnolia tree in the Fall.

The bark and flower buds of M. officinalis have long been used in traditional Chinese medicine, where they are known as hou po (厚朴). In Japan, kōboku, M. obovata, has been used in a similar manner.[37][38]

Timber

The cucumbertree, M. acuminata, grows to large size and is harvested as a timber tree in northeastern US forests. Its wood is sold as "yellow poplar" along with that of the tuliptree, Liriodendron tulipifera. The Fraser magnolia, M. fraseri, also attains enough size sometimes to be harvested, as well.

Other uses

Magnolias are used as food plants by the larvae of some Lepidoptera species, including the giant leopard moth.

Chemical compounds and bioeffects

The aromatic bark contains magnolol, honokiol, 4-O-methylhonokiol, and obovatol.[39][40][41][42][43][44] Magnolol[45] and honokiol[46] activate the nuclear receptor peroxisome proliferator-activated receptor gamma.

Culture

Symbols

Film and television

  • Paul Thomas Anderson created a movie titled Magnolia.
  • Steel Magnolias is a 1989 American comedy-drama film about the bond among a group of women from Louisiana, who can be as beautiful as magnolias, but are as tough as steel. The name 'magnolia' specifically refers to a magnolia tree about which they are arguing at the beginning.[47]
  • Sweet Magnolias is a 2020 Netflix Original Series


Music

Literature

Pastoral scene of the gallant south
The bulging eyes and the twisted mouth
Scent of magnolias, sweet and fresh,
Then the sudden smell of burning flesh.

Despite Meeropol's frequent mention of the South and magnolia trees, the horrific image which inspired his poem, Lawrence Beitler's 1930 photograph capturing the lynching of Thomas Shipp and Abram Smith following the robbery and murder of Claude Deteer, actually occurred in Marion, Indiana, where magnolia trees are less common.

  • In the 1960s, magnolias were a symbol of the South in the popular press: the New York Post noted of Lyndon Johnson that "A man who wore a ten-gallon Stetson and spoke with a magnolia accent had little hope of winning the Democratic nomination in 1960", and biographer Robert Caro picks up the symbol by saying that when Johnson became president "[t]he taint of magnolias still remained to be scrubbed off."[48]

Visual arts

Magnolia by Sarah Maloney

The Canadian artist, Sarah Maloney,[49] has created a series of sculptures of magnolia flowers in bronze and steel, entitled First Flowers,[50] in which she draws our attention to the dual symbols of beginnings in the flower, as both an evolutionary archetype and also one of the first trees to flower in spring (see illustration).

See also

Notes

  1. The number of species in the genus Magnolia depends on the taxonomic view that one takes up. Recent molecular and morphological research shows that former genera Talauma, Dugandiodendron, Manglietia, Michelia, Elmerrillia, Kmeria, Parakmeria, Pachylarnax (and a small number of monospecific genera) all belong within the same genus, Magnolia s.l. (s.l. = sensu lato: 'in a broad sense', as opposed to s.s. = sensu stricto: 'in a narrow sense'). The genus Magnolia s.s. contains about 120 species. See the section Nomenclature and classification in this article.
  2. Under the rule of priority, the first name that is validly published in Linnaeus' Species Plantarum (1 May 1753) or any other work of any other botanist after that, takes precedence over later names. Plumier's name was not a binomen and moreover published before Species Plantarum, so it has no status. The first binomen published after 1753 was Lamarck's Annona dodecapetala (1786). Magnolia plumieri (1788) was published on a later date by Schwartz, and is treated as a later synonym, as are Magnolia fatiscens (1817; Richard), Talauma caerulea (Jaume St-Hilaire 1805) and Magnolia linguifolia (1822).
  3. Magnolia glauca has the same type specimen as Magnolia virginiana and as the latter is the first valid name, the species is now called Magnolia virginiana (sweetbay magnolia). Var. fœtida was renamed Magnolia grandiflora, which is legitimate as the epithet fœtida only has priority in its rank of variety. Magnolia grandiflora is the southern magnolia. Magnolia tripetala (umbrella magnolia) and Magnolia acuminata (cucumber tree) are still recognized as species.
  4. Under these names the species were described by Desrousseaux in Lamarck's Encyclopédie Méthodique Botanique, tome troisieme (1792): 675. In the beginning of the 20th century, descriptions which seemed to represent the same species, were found in a work of the French naturalist P.J. Buc'hoz, Plantes nouvellement découvertes (1779), under the names Lassonia heptapeta and Lassonia quinquepeta. In 1934, the English botanist J.E. Dandy argued that these names had priority over the names by which both species had been known for over a century and hence from then on Magnolia denudata had to be named Magnolia heptapeta, Magnolia liliiflora should be changed into Magnolia quinquepeta. After a lengthy debate, specialist taxonomists decided that the Buc'hoz's names were based on chimaeras (pictures constructed of elements of different species), and as Buc'hoz did not cite or preserve herbarium specimens, his names were ruled not to be acceptable.
  5. These species were published as Liriodendron coco and Liriodendron figo by J. de Loureiro in Flora Cochinchinensis (1790) and later (1817) transferred to Magnolia by A. P. de Candolle. Magnolia figo was soon after transferred to the genus Michelia.
  6. In 1927 J.E. Dandy accepted 10 genera in The genera of Magnoliaceae, Kew Bulletin 1927: 257–264. In 1984 Law Yuh-Wu proposed 15 in A preliminary study on the taxonomy of the family Magnoliaceae, Acta Phytotaxonomica Sinica 22: 89–109; in 2004 even 16, in Magnolias of China. This is not just about grouping some genera together where others do not; authors often choose different boundaries.
  7. Often treated as a distinct species, Magnolia pyramidata.
  8. Often treated as a distinct species, Magnolia ashei.
  9. "Tulip tree" usually refers to Liriodendron tulipifera, but sometimes refers to Magnolia species,[30][31] especially Magnolia × soulangeana.[32][33][34]

References

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