Английская Википедия:Dudleya abramsii subsp. setchellii

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Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infraspeciesbox Dudleya abramsii subsp. setchellii, known by common name as the Santa Clara Valley dudleya or Santa Clara Valley liveforever, is a member of the Dudleya genus of succulent perennials, members of the family Crassulaceae. The Santa Clara Valley dudleya, endemic to the Santa Clara Valley region in the southern San Francisco Bay Area, was listed on 3 February 1995, as an endangered species.[1] It is considered to be a subspecies of Dudleya abramsii, but its taxonomic status is still unclear. Its closest relative is Dudleya cymosa subsp. paniculata, which is a morphologically similar sister taxon.[2][3][4]

Description

A perennial rosette-forming succulent, this species is characterized by pale yellow petals, a simple (not branching multiple times) inflorescence, and a restriction to serpentine soil.[5]

Morphology

This rosettes are anywhere from Шаблон:Cvt wide, on top of stems (also referred to as caudices) that are Шаблон:Cvt wide. The stems may branch dichotomously to form 1 to 5 rosettes. The leaves are shaped oblong-triangular to lance-elliptic to lanceolate, and have a glaucous surface. The leaves measure Шаблон:Cvt long by Шаблон:Cvt wide.[6][7]

The peduncle is Шаблон:Cvt tall and Шаблон:Cvt wide. The lower bracts on the peduncle measure Шаблон:Cvt long. There are typically 2 to 3 first degree branches on the inflorescence, which are oriented in an ascending fashion and usually do not bifurcate further. On the branches are pedicels, measuring Шаблон:Cvt in length, holding the flowers. The flowers have sepals that are Шаблон:Cvt long, and shaped deltate. The petals are Шаблон:Cvt long by Шаблон:Cvt wide, and shaped elliptic, with their tips acute. The lower parts of the petals are fused Шаблон:Cvt the way up to form a tube. The petals are colored a pale yellow.[6][7]

Taxonomy

Шаблон:Cladogram Dudleya abramsii subsp. setchellii has undergone numerous changes in its taxonomic classification. Originally placed a subspecies of Cotyledon laxa / Echeveria laxa,[8][9] an antiquated synonym for Dudleya caespitosa, botanists Nathaniel Lord Britton and Joseph Nelson Rose placed it as a separate species within Dudleya in 1903.[10] In a 1957 issue of Madroño, botanist Reid Moran revised setchellii as a subspecies of Dudleya cymosa.[11] Cotyledon caespitosa var. paniculata, now Dudleya cymosa subsp. paniculata, was merged into setchellii.[12] Almost half a century later, Moran and other botanists returned to setchellii, and again revised it as a subspecies of Dudleya abramsii.[3]

It is visually similar to and sometimes indistinguishable from Dudleya cymosa subsp. paniculata.[12] Recent phylogenetic analysis may in fact place setchellii back into a subspecies of D. cymosa, as it is most closely related to D. c. subsp. paniculata.[4] Reid Moran, who combined it back into D. abramsii, suggests that it owes a superficial resemblance to Dudleya abramsii subsp. murina.[3]

Файл:Dudleya setchellii (15390385109).jpg
The inflorescence and flowers

Distribution

Dudleya abramsii subsp. setchellii is found only in the Coyote Valley area of southern Santa Clara County, California, mostly on rocky outcrops within serpentine grasslands on Tulare Hill and the Santa Teresa Hills west of Coyote Creek in south San Jose and south of Metcalf Canyon east of Coyote Creek.[1][3][6]

Gallery

See also

References

Шаблон:Reflist

External links

Шаблон:Taxonbar

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  1. ↑ 1,0 1,1 Шаблон:Cite web
  2. ↑ Шаблон:Citation
  3. ↑ 3,0 3,1 3,2 3,3 Шаблон:Cite journal
  4. ↑ 4,0 4,1 Шаблон:Cite journal
  5. ↑ Шаблон:Cite web
  6. ↑ 6,0 6,1 6,2 Шаблон:Cite web
  7. ↑ 7,0 7,1 Шаблон:Cite eFloras
  8. ↑ Шаблон:Cite journal
  9. ↑ Шаблон:Cite journal
  10. ↑ Шаблон:Cite journal
  11. ↑ Шаблон:Cite journal
  12. ↑ 12,0 12,1 Шаблон:Cite journal
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