Dudleya saxosa subsp. collomiae

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Dudleya saxosa subsp. collomiae
Dudleya saxosa collomiae 131850688.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. saxosa
Subspecies:
D. s. subsp. collomiae
Trinomial name
Dudleya saxosa subsp. collomiae

Dudleya saxosa subsp. collomiae, known by the common name Gila County liveforever, is a subspecies of perennial succulent plant within the genus Dudleya native to central Arizona.

Description[]

Flowering

The caudex is 1.2 cm (0.5 in) to 3.1 cm (1.25 in) thick, branching to form up to 8 rosettes. The rosette is relatively flat and possesses 10 to 18 leaves. The leaf colors are a yellowish-green to white, with the bottom leaves gradually turning green. The leaves are 7.6 cm (3 in) to 15 cm (6 in) long, and 1.2 cm (0.5 in) to 2.2 cm (0.9 in) wide.[1]

Taxonomy[]

Dudleya saxosa subsp. collomiae has been variously classified as a separate species, or a member of the genus Echeveria, like many Dudleya, but current consensus has it as a subspecies of Dudleya saxosa.

Etymology[]

The species is named for Mrs. Rose E. Collom, a botanist, of which she collected the holotype specimen of Dudleya saxosa subsp. collomiae.[2]

Phylogenetics[]

This species has a chromosome number of n = 68. Compared to a similar relative under the same species, Dudleya saxosa subsp. aloides, a diploid, the Arizona subspecies is polyploid, and has larger flowers. They are also relatively isolated from each other, with the whole species having a disjunct distribution.[3][4]

Distribution and habitat[]

Dudleya saxosa subsp. collomiae is the only other species of Dudleya native to Arizona, the other being Dudleya arizonica, the Arizona Chalk Dudleya. It has a preference for rocky slopes, crevices, and canyons in central Arizona on sky islands, occurring from 2,000 to over 6,000 ft. in elevation.[1]

References[]

  1. ^ a b Thomson, Paul H. (1993). Dudleya and Hasseanthus Handbook. Bonsall, California: Bonsall Publications. pp. 64–65. ISBN 9780960206650.
  2. ^ Gentry, Mary A. (1082). "Women Botanists and Plant Collectors of Arizona" (PDF). Central Arizona Cactus and Succulent Society Newsletter, the Central Spine. 2 (4): 2. Retrieved 26 March 2015.
  3. ^ Moran, Reid (1957). "Dudleya saxosa (M. E. Jones) Britton & Rose subsp. collomiae". Madroño. 14: 108.
  4. ^ "Dudleya saxosa subsp. collomiae". Flora of North America. 8: 187–188 – via efloras.org.
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