Micranthes idahoensis |
Micranthes gormanii |
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Idaho saxifrage |
Gorman's saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants in groups or, sometimes, almost mat-forming, rhizomatous. |
Leaves | basal; petiole flattened, 1–5 cm; blade ovate to elliptic, 1–4 cm, ± fleshy, base attenuate, margins shallowly serrate to dentate (teeth usually to 1 mm), sparsely ciliate, surfaces tangled, reddish brown-hairy abaxially, glabrate adaxially. |
basal; petiole flattened, 5–7.5 cm; blade ovate to elliptic, 3–4 cm, fleshy, base attenuate, margins shallowly crenate-serrate, sparsely ciliate, surfaces tangled, reddish brown-hairy. |
Inflorescences | 15+-flowered, open thyrses, (flowers ± crowded at tips, becoming more open in fruit), 10–40 cm, purple-tipped stipitate-glandular. |
(10–)30+-flowered, open, lax, strongly divaricately branched, conic thyrses, 8–30 cm, purple-tipped stipitate-glandular; (bracts glabrous, proximal marginally ciliate). |
Flowers | sepals reflexed, ovate to oblong; petals white, with 2 basal yellow spots (often faded when dried), elliptic to ovate, clawed to nearly not clawed, 1–3.5 mm, ± equaling sepals; filaments club-shaped, not petaloid, (equaling petals); pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
sepals ascending, ovate to oblong, (margins eciliate, surfaces glabrous); petals white, not spotted, obovate to ± round, clawed, ca. 2 mm, ca. 1.5 times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary nearly 1/3 inferior, (to 1/3 adnate to hypanthium). |
Capsules | green to reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 20. |
= 20, 38, 40. |
Micranthes idahoensis |
Micranthes gormanii |
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Phenology | Flowering spring–early summer. | Flowering spring. |
Habitat | Open ledges and slopes | Wet, rocky ledges and slopes |
Elevation | 500-2500 m (1600-8200 ft) | 0-1000 m (0-3300 ft) |
Distribution |
ID; MT; OR; WA
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OR; WA
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Discussion | Micranthes idahoensis appears to hybridize with M. occidentalis where their ranges overlap. Intermediates are abundant in some populations along the Idaho-Montana border and in Montana. This phenomenon may explain the range of filament shapes found in M. occidentalis, from flattened to sightly club-shaped. The issue of the status of M. idahoensis with respect to M. marshallii (D. L. Krause and K. I. Beamish 1972) is best deferred until a thorough study of the whole complex over its entire range is done. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 64. | FNA vol. 8, p. 62. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga idahoensis, Saxifraga marshallii subsp. idahoensis, Saxifraga marshallii var. idahoensis, Saxifraga occidentalis var. idahoensis | Saxifraga gormanii, Saxifraga occidentalis var. dentata |
Name authority | (Piper) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , | (Suksdorf) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
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