Micranthes hitchcockiana |
Micranthes occidentalis |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
mountain saxifrage, redwool saxifrage, western saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants in groups or sometimes almost mat-forming, with bulbils on caudices or rhizomatous. |
Leaves | basal; petiole often indistinct, flattened, 5–50 mm; blade elliptic to obovate, 4–12 cm, slightly fleshy, base cuneate, margins serrate to dentate, densely ciliate, surfaces densely tangled-hairy. |
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 | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
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 reflexed, elliptic to ovate; petals white, not spotted, elliptic, clawed, 2–5 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2 inferior, appearing more superior in fruit. |
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 to reddish purple, folliclelike. |
greenish or reddish to ± dark purple, folliclelike. |
2n | = 76. |
= 20, 38, 40, 56, 58. |
Micranthes hitchcockiana |
Micranthes occidentalis |
|
Phenology | Flowering late spring–summer. | Flowering spring–summer. |
Habitat | Wet rocks and ledges on mountain-top balds | Wet, rocky or gravelly slopes, moist to dry alpine meadows, flushes |
Elevation | 600-1100 m (2000-3600 ft) | 500-4000 m (1600-13100 ft) |
Distribution |
OR
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AK; ID; MT; NV; OR; SD; WA; WY; AB; BC; SK
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Discussion | Of conservation concern. Micranthes hitchcockiana may have originated from hybridization between M. rufidula and M. oregana (P. E. Elvander 1984; W. E. Perkins 1978). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 70. | FNA vol. 8, p. 62. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga hitchcockiana | Saxifraga occidentalis, Saxifraga allenii, Saxifraga occidentalis var. allenii, Saxifraga occidentalis var. wallowensis, Saxifraga reflexa subsp. occidentalis, Saxifraga saximontana |
Name authority | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (S. Watson) Small: in N. L. Britton et al., N. Amer. Fl. 22: 144. 1905 , |
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