Micranthes ferruginea |
Micranthes nidifica |
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Alaska saxifrage, rusty hair saxifrage, rusty saxifrage |
Columbia saxifrage, meadow saxifrage, peak saxifrage, swamp saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. | Plants solitary or in clumps, with bulbils on caudices. |
Leaves | basal; petiole indistinct, flattened, to 2 cm; blade spatulate to oblanceolate, 1–8(–10) cm, ± fleshy, base cuneate, margins irregularly serrate (usually with fewer than 12 coarse teeth), ciliate, surfaces hairy. |
basal; petiole flattened, 1.5–5.5 cm; blade ± ovate to elliptic, 3–6(–7.5) cm, fleshy, base attenuate, margins entire or minutely denticulate, ciliate, surfaces glabrate to sparsely hairy. |
Inflorescences | 20–30+-flowered, (flowers sometimes replaced ± completely by bulbils, or bulbils sometimes absent), open, lax thyrses, 10–40 cm, moderately to ± densely purple stipitate-glandular; (bracts reduced). |
30+-flowered, lax, cylindric thyrses with 3–10, ± compact cymules, 10–30 cm, ± densely pink- to purple-tipped stipitate-glandular. |
Flowers | ± bilaterally symmetric; sepals reflexed, ovate to oblong; petals white, 3 with 2 basal yellow spots, 2 without spots, elliptic to oblanceolate, clawed, 3–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior, (to 1/3 adnate to hypanthium). |
sepals strongly reflexed, broadly ovate to deltate; petals white to greenish white, not spotted, usually elliptic to obovate, clawed, 1–1.9 mm, equaling or shorter than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
Capsules | green or yellow, sometimes purple tinged, or partly purple, valvate. |
green or reddish purple, folliclelike. |
2n | = 20. |
= 38. |
Micranthes ferruginea |
Micranthes nidifica |
|
Phenology | Flowering summer–early autumn. | Flowering spring–summer. |
Habitat | Wet ledges, seepage slopes, stream banks | Open meadows, shrub-lands, gravelly slopes, edges of and open pine forests |
Elevation | 10-2700 m (0-8900 ft) | 100-2600 m (300-8500 ft) |
Distribution |
AK; CA; ID; MT; OR; WA; WY; AB; BC; NT
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CA; ID; MT; NV; OR; UT; WA; WY; BC
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Discussion | Plants with bulbils replacing flowers are more common in the southern part (southern Alberta and British Columbia southwards) of the range of Micranthes ferruginea and have been called Saxifraga ferruginea var. macounii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Micranthes nidifica is polymorphic and merges to some extent with M. fragosa in limited areas of southern Washington and northern Oregon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 58. | FNA vol. 8, p. 68. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga ferruginea, Saxifraga ferruginea var. macounii, Saxifraga ferruginea var. newcombei, Saxifraga ferruginea var. vreelandii, Saxifraga newcombei | Saxifraga nidifica, M. plantaginea, Saxifraga columbiana, Saxifraga integrifolia var. columbiana, Saxifraga integrifolia var. leptopetala, Saxifraga montana, Saxifraga plantaginea |
Name authority | (Graham) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 134. (1905) |
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