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Compilation
Saxifraga allenii

4 Images see all

Isotype of Saxifraga occidentalis Wats. var. allenii (Small) Hitchc. [family SAXIFRAGACEAE]
Type of Saxifraga allenii (Small) Fedde [family SAXIFRAGACEAE]
Type of Micranthes allenii Small [family SAXIFRAGACEAE]
Type of Micranthes allenii Small [family SAXIFRAGACEAE]
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Name

Identification
Saxifraga allenii (Small) Fedde [family SAXIFRAGACEAE ] (stored under name); Verified by Johnson, Saxifraga nivalis L. [family SAXIFRAGACEAE ] Verified by Not on sheet, Micranthes allenii Small [family SAXIFRAGACEAE ] Verified by Not on sheet, Micranthes allenii Small [family SAXIFRAGACEAE ] Verified by Not on sheet,
Related name
  • Saxifraga allenii
  • Micranthes allenii
  • Saxifraga nivalis
Common name
  • Western or redwool saxifrage, Flora of North America Vol. 8

Flora

Entry for Micranthes occidentalis (S. Watson) Small [family ]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 8,
Names
Micranthes occidentalis (S. Watson) Small [family ], in N. L. Britton et al., N. Amer. Fl., 22: 144. 1905 ,
Saxifraga occidentalis S. Watson [family SAXIFRAGACEAE], Proc. Amer. Acad. Arts, 23: 264. 1888
Saxifraga allenii (Small) Fedde [family SAXIFRAGACEAE]
Saxifraga occidentalis var. allenii (Small) C. L. Hitchcock [family SAXIFRAGACEAE]
Saxifraga occidentalis var. wallowensis M. Peck [family SAXIFRAGACEAE]
Saxifraga reflexa Hooker subsp. occidentalis (S. Watson) Hultén [family SAXIFRAGACEAE]
Saxifraga saximontana E. E. Nelson [family SAXIFRAGACEAE]
Treatment Author(s)
Luc Brouillet
Patrick E. Elvander†
Information
Plants in groups or sometimes almost mat-forming, with bulbils on caudices or rhizomatous. Leaves basal; petiole flattened, 1–5 cm; blade ovate to elliptic, 1.5–3.5 cm, ± fleshy, base ± attenuate to ± truncate, margins shallowly, sharply serrate, ciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrous adaxially. Inflorescences usually (10–)30+-flowered, flowers crowded into 1+ glomerules in thyrses with ascending branches, 8–30 cm, purple-tipped stipitate-glandular; (bracts glabrous or marginally glandular-ciliate). Flowers: sepals ascending to spreading, sometimes reflexed in fruit, ovate to oblong, (surfaces glabrous); petals white, not spotted (spots rarely present), obovate to almost round, clawed, 2–4 mm, to 1.5 times as long as sepals; filaments linear to very slightly widened near anthers, flattened; pistils distinct almost to base; ovary ± superior. Capsules greenish or reddish to ± dark purple, folliclelike. 2n = 20, 38, 40, 56, 58.
Phenology
Flowering spring–summer
Altitude range
500–4000 m
Distribution
USA AlaskaUSA IdahoUSA Mont.USA Nev.USA Oreg.USA S.Dak.USA Wash.USA Wyo.Canada Alta.Canada B.C.Canada Sask.
Discussion
Micranthes occidentalis appears closely related to the little-known M. mexicana (Engler & Irmscher) Brouillet & Gornall from Chihuahua, Mexico. The latter is the only species of the genus that occurs in Mexico and not in the United States. Micranthes occidentalis is disjunct between the northern Rocky Mountains and the Cypress Hills of southeastern Alberta and southwestern Saskatchewan, and the Black Hills of South Dakota. It hybridizes with M. idahoensis where their ranges overlap.

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