Dudleya cymosa subsp. paniculata

Dudleya cymosa subsp. paniculata, known by the common name Diablo Range dudleya,[3] is a species of perennial succulent plant in the family Crassulaceae native to the Inner South Coast Range of California. It is characterized by pale yellowish flowers, oblong to oblanceolate leaves and a growth habit not limited to a single substrate. It is closely related to Dudleya abramsii subsp. setchellii.[4]

Dudleya cymosa subsp. paniculata

Apparently Secure  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. cymosa
Subspecies:
D. c. subsp. paniculata
Trinomial name
Dudleya cymosa subsp. paniculata
(Jeps.) K.M.Nakai
Synonyms[2]
  • Cotyledon caespitosa var. paniculata Jeps.
  • Dudleya humilis Britton & Rose
  • Dudleya paniculata Britton & Rose

Description

This plant is not usually caespitose, rosettes are solitary to few. The rosettes are 4 to 11 cm wide. The stems are 1 to 2 cm wide. The leaves are 3 to 10 cm, 5 to 20 mm wide, shaped oblong, oblanceolate to lance-oblong, green to more or less white, and the foliage may or may not be glaucous, leaf tip acute. The peduncle is 5 to 25 cm long, and the inflorescence contains 2 to 3 branches that rebranch once or twice. The terminal branches are 1 to 5 cm long, with 4 to 10 flowers, on pedicels 3 to 12 mm long. The petals are 1.5 to 2.5 mm wide, colored a pale yellow to white-yellow, or pale-yellow pink in the San Joaquin Valley.[5]

Flowering is from May to June.[5]

Taxonomy

Taxonomic history

This plant was first described as Cotyledon caespitosa var. paniculata by Jepson in 1901.[6] In Nathaniel Lord Britton and Joseph Nelson Rose's reorganization of North American Crassulaceae in 1903, they described this plant as Dudleya paniculata and Dudleya humilis.[7] In the 1950s, Reid Moran regarded Cotyledon caespitosa var. paniculata as a synonym of Dudleya cymosa subsp. setchellii, although he noted that they could be separated on the basis of leaf shape. Botanist Kei M. Nakai later again separated paniculata as Dudleya cymosa subsp. paniculata, and reduced Dudleya humilis as a synonym for subsp. paniculata plants that have become edaphic dwarfs.[2]

Cladogram of Dudleya cymosa subsp. paniculata
Virens clade

D. abramsii subsp. setchellii

D. cymosa subsp. paniculata

D. cymosa subsp. cymosa

Characteristics

Dudleya cymosa subsp. paniculata can be differentiated from its close relative,[4] Dudleya abramsii subsp. setchellii, in a number of ways. D. c. ssp. paniculata plants have oblong to oblanceolate rosette leaves rather than oblong-triangular leaves, an inflorescence of 2 to 3 branches that rebranch once or twice rather than an inflorescence of 2 to 3 branches that do not rebranch, and pedicels that are 6 to 12 mm long against pedicels that are 4 to 7 mm long. D. a. ssp. setchellii is also only restricted to serpentine rock outcrops, while this species occurs on a variety of substrates.[2]

Distribution and habitat

This species occurs throughout the Inner South Coast Ranges, the eastern San Francisco Bay Area, and mountainous portions of the San Joaquin Valley.[5] It is particularly conspicuous on Mount Diablo and Mount Hamilton. It is found on rocky outcrops and in canyons.[2]

  • Flowering in habitat, Mount Diablo
    Flowering in habitat, Mount Diablo
  • Flowering in habitat, Henry W. Coe State Park
    Flowering in habitat, Henry W. Coe State Park
  • Flowering in habitat, Mount Diablo
    Flowering in habitat, Mount Diablo

See also

References
  1. "Dudleya cymosa ssp. paniculata". NatureServe Explorer. NatureServe. 2021. Retrieved 17 December 2021.
  2. Nakai, Kei M. (1987). "Some New and Reconsidered California Dudleya (Crassulaceae)". Madroño. 34 (4): 338–339.
  3. "Dudleya cymosa ssp. paniculata". Lady Bird Johnson Wildflower Center. The University of Texas at Austin. 2021-10-29. Archived from the original on 2021-12-17. Retrieved 17 December 2021.
  4. Yost, J. M.; Bontrager, M.; McCabe, S. W.; Burton, D.; Simpson, M. G.; Kay, K. M.; Ritter, M. (2013). "Phylogenetic relationships and evolution in Dudleya (Crassulaceae)" (PDF). Systematic Botany. 38 (4): 1096–1104. doi:10.1600/036364413X674760. S2CID 15715233.
  5. McCabe, Stephen Ward (2012). "Dudleya cymosa subsp. paniculata". Jepson eFlora. Jepson Flora Project (eds.). Archived from the original on 2017-05-08. Retrieved 17 December 2021.
  6. A Flora of Western Middle California. Berkeley, California: Encina Publishing Company. 1901. p. 267. OCLC 663440141.
  7. Rose, Joseph Nelson (1903). "New and noteworthy North American Crassulaceae". Bulletin of the New York Botanical Garden. 3 (9).
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