Plectranthus

Plectranthus is a genus of about 85 species of flowering plants from the sage family, Lamiaceae, found mostly in southern and tropical Africa and Madagascar. Common names include spur-flower. Plectranthus species are herbaceous perennial plants, rarely annuals or soft-wooded shrubs, sometimes succulent; sometimes with a tuberous base.[2]

Plectranthus
Plectranthus fruticosus
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Lamiaceae
Subfamily: Nepetoideae
Tribe: Ocimeae
Genus: Plectranthus
L'Hér.[1]
Species

Many, see text

Synonyms[1]

Ascocarydion G.Taylor
Burnatastrum Briq.
Capitanya Gürke
Dielsia Kudô
Englerastrum Briq.
Germanea Lam.
Holostylon Robyns & Lebrun
Isodictyophorus Briq.
Leocus A.Chev.
Neomuellera Briq.
Perrierastrum Guillaumin
Symphostemon Hiern

Several species are grown as ornamental plants. The cultivar Mona Lavender = 'Plepalila' [3] has received the Royal Horticultural Society's Award of Garden Merit.

Recent phylogenetic analysis found Plectranthus to be paraphyletic with respect to Coleus, Solenostemon, Pycnostachys and Anisochilus. The most recent treatment of the genus resurrected the genus Coleus, and 212 names were changed from combinations in Plectranthus, Pycnostachys and Anisochilus. Equilabium was segregated from Plectranthus, after phylogenetic studies supported its recognition as a phylogenetically distinct genus.[2]

Etymology

The word plectranthus derives from the Greek πλῆκτρον (plēktron), "anything to strike with, an instrument for striking the lyre, a spear point"[4] + ἄνθος (anthos), "blossom, flower".[5]

Species
Plectranthus verticillatus in cultivation

Paton et al. (2019) listed 72 species.[2] As of October 2022, Plants of the World Online accepted 84:

  • Plectranthus alboviolaceus Gürke – South Africa: E. Cape Prov. to N. KwaZulu-Natal
  • Plectranthus ambiguus (Bolus) Codd – South Africa: E. Cape Prov. to N. KwaZulu-Natal
  • Plectranthus amplexicaulis Hedge – Madagascar
  • Plectranthus antongilicus Hedge – Madagascar
  • Plectranthus asymmetricus A.J.Paton – Zambia
  • Plectranthus atroviolaceus Hedge – Madagascar
  • Plectranthus aulihanensis (Schweinf. & Volkens) ined.
  • Plectranthus betamponus Hedge – Madagascar
  • Plectranthus bracteolatus A.J.Paton – Tanzania
  • Plectranthus brevicaulis (Baker) Hedge – Madagascar
  • Plectranthus brevimentus T.J.Edwards (also as P. brevimentum) – South Africa: Eastern Cape Prov
  • Plectranthus canescens Benth. – Madagascar
  • Plectranthus capuronii Hedge – Madagascar
  • Plectranthus chimanimanensis S.Moore – E. Zimbabwe to W. Mozambique
  • Plectranthus ciliatus E.Mey. – South Africa and Eswatini
  • Plectranthus clementiae Hedge – Madagascar
  • Plectranthus cordatus A.J.Paton & Phillipson – Madagascar
  • Plectranthus decaryi Hedge – Madagascar
  • Plectranthus delicatissimus Hedge – Madagascar
  • Plectranthus ecklonii Benth. – South Africa
  • Plectranthus elegans Britten – S. Malawi
  • Plectranthus elegantulus Briq. – South Africa: KwaZulu-Natal
  • Plectranthus ellipticus Hedge – Madagascar
  • Plectranthus emirnensis (Baker) Hedge – Madagascar
  • Plectranthus ernstii Codd – South Africa: E. Cape Prov. to S. KwaZulu-Natal
  • Plectranthus forsythii Hedge – Madagascar
  • Plectranthus fruticosus L’Hér. – S. Mozambique to South Africa
  • Plectranthus gardneri Thwaites – Sri Lanka
  • Plectranthus gibbosus Hedge – Madagascar
  • Plectranthus godefroyae (N.E.Br.) ined.
  • Plectranthus grallatus Briq. – South Africa, Lesotho
  • Plectranthus grandibracteatus Hedge – Madagascar
  • Plectranthus guruensis A.J.Paton – Mozambique
  • Plectranthus hexaphyllus Baker – Madagascar
  • Plectranthus hilliardiae Codd – South Africa: Transkei to KwaZulu-Natal
  • Plectranthus hirsutus Hedge – Madagascar
  • Plectranthus hoslundioides Scott-Elliot – Madagascar
  • Plectranthus humbertii Hedge – Madagascar
  • Plectranthus incrassatus Hedge – Madagascar
  • Plectranthus laurifolius Hedge – Madagascar
  • Plectranthus linearis Hedge – Madagascar
  • Plectranthus longiflorus Benth. – Madagascar
  • Plectranthus longipetiolatus Hedge – Madagascar
  • Plectranthus lucidus (Benth.) van Jaarsv. & T.J.Edwards – South Africa: S. Cape Prov
  • Plectranthus macilentus Hedge – Madagascar
  • Plectranthus malvinus van Jaarsv. & T.J.Edwards – South Africa: E. Cape Prov
  • Plectranthus mandalensis Baker – Malawi (Mt. Mulanje), Mozambique (Mt. Namuli)
  • Plectranthus marquesii Gürke
  • Plectranthus mechowianus (Briq.) ined.
  • Plectranthus membranaceus (Scott-Elliot) Hedge – Madagascar
  • Plectranthus miserabilis Briq.
  • Plectranthus mocquerysii Briq. – Madagascar
  • Plectranthus mzimvubuensis van Jaarsv. – South Africa: SE. Cape Prov
  • Plectranthus oblanceolatus Hedge – Madagascar
  • Plectranthus oertendahlii T.C.E.Fr. – South Africa: S. KwaZulu-Natal
  • Plectranthus ombrophilus Hedge – Madagascar
  • Plectranthus oribiensis Codd – South Africa: KwaZulu-Natal
  • Plectranthus papilionaceus Ranir. & Phillipson – Madagascar
  • Plectranthus parvifolius Talbot
  • Plectranthus pichompae Hedge – Madagascar
  • Plectranthus poggeanus (Briq.) ined.
  • Plectranthus praetermissus Codd – South Africa: SE. Cape Prov
  • Plectranthus preussii (Gürke) ined.
  • Plectranthus purpuratus Harv. – South Africa
  • Plectranthus reflexus van Jaarsv. & T.J.Edwards – South Africa: SE. Cape Prov
  • Plectranthus rosulatus Hedge – NW. Madagascar
  • Plectranthus rubropunctatus Codd – South Africa: Limpopo to Eswatini
  • Plectranthus rubroviolaceus Hedge – Madagascar
  • Plectranthus saccatus Benth. – South Africa: SE. Cape Prov. to KwaZulu-Natal
  • Plectranthus scaposus Hedge – Madagascar
  • Plectranthus schweinfurthii Sprenger
  • Plectranthus secundiflorus (Baker) Hedge – Tanzania (Uluguru Mts.)
  • Plectranthus strangulatus A.J.Paton – Tanzania (Uluguru Mts.)
  • Plectranthus strigosus Benth. ex E.Mey. – South Africa: S. Cape Prov
  • Plectranthus stylesii T.J.Edwards – South Africa: Eastern Cape Prov
  • Plectranthus swynnertonii S.Moore – S. Trop. Africa to South Africa, Mpumalanga
  • Plectranthus termiticola A.J.Paton
  • Plectranthus trilobus Hedge – Madagascar
  • Plectranthus verticillatus (L.f.) Druce – S. Mozambique to South Africa
  • Plectranthus vestitus Benth. – Madagascar
  • Plectranthus vinaceus Hedge – Madagascar
  • Plectranthus viridis (Briq.) ined.
  • Plectranthus zenkeri Gürke
  • Plectranthus zuluensis T.Cooke – South Africa: SE. Cape Prov. to Eswatini

Transferred to Coleus

Species transferred to Coleus in 2019 include:[2]

Other species formerly placed in Plectranthus
  • Anisochilus carnosus (L. f.) Wall. ex Benth. (as P. strobilifer Roxb.)
  • Capitanopsis oreophila (Hedge) Mwany., A.J.Paton & Culham (as P. bipinnatus A.J.Paton)
  • Isodon coetsa (Buch.-Ham. ex D.Don) Kudô (as P. coetsa Buch.-Ham. ex D.Don)
  • Isodon inflexus (Thunb.) Kudô (as P. inflexus (Thunb.) Vahl ex Benth.)
  • Isodon lophanthoides (Buch.-Ham. ex D.Don) H.Hara (as P. striatus Benth.)
  • Isodon rugosus (Wall. ex Benth.) Codd (as P. rugosus Wall. ex Benth.)
  • Isodon sculponeatus (Vaniot) Kudô (as P. sculponeatus Vaniot)[7]

References
  1. "Genus: Plectranthus L'Hér". Germplasm Resources Information Network. United States Department of Agriculture. 2007-10-05. Archived from the original on 2011-06-29. Retrieved 2011-02-17.
  2. Paton, Alan J.; Mwanyambo, Montfort; Govaerts, Rafaël H.A.; Smitha, Kokkaraniyil; Suddee, Somran; Phillipson, Peter B.; Wilson, Trevor C.; Forster, Paul I. & Culham, Alastair (2019). "Nomenclatural changes in Coleus and Plectranthus (Lamiaceae): a tale of more than two genera". PhytoKeys (129): 1–158. doi:10.3897/phytokeys.129.34988. PMC 6717120. PMID 31523157.
  3. "Plectranthus Mona Lavender = 'Plepalila'". RHS. Retrieved 18 January 2021.
  4. πλῆκτρον, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  5. ἄνθος, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  6. "Plectranthus hadiensis (Forssk.) Schweinf. ex Sprenger", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2022-10-07
  7. "GRIN Species Records of Plectranthus". Germplasm Resources Information Network. United States Department of Agriculture. Archived from the original on December 11, 2012. Retrieved 2011-02-17.
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