Micranthes palmeri |
Micranthes ferruginea |
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Palmer's saxifrage |
Alaska saxifrage, rusty hair saxifrage, rusty saxifrage |
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Habit | Plants solitary or in clumps, with bulbils on caudices. | Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. |
Leaves | basal; petiole flattened, 1–9 cm; blade ovate to elliptic, 2–8 cm, slightly fleshy, base attenuate, margins entire or subentire, ciliate, surfaces tangled, reddish brown-hairy. |
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. |
Inflorescences | 30+-flowered, (flowers sometimes almost secund), very open, lax thyrses, 6–50 cm, hairy proximally, densely so distally. |
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). |
Flowers | sepals erect to ascending, ovate to triangular; petals white, not spotted, broadly oblong to elliptic, not clawed, 3–6 mm, 2+ times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary ± superior, (to 1/3 adnate to hypanthium). |
± 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). |
Capsules | green with reddish or purplish tinge, or reddish purple, folliclelike. |
green or yellow, sometimes purple tinged, or partly purple, valvate. |
2n | = 20. |
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Micranthes palmeri |
Micranthes ferruginea |
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Phenology | Flowering spring. | Flowering summer–early autumn. |
Habitat | Rocky, open woodlands | Wet ledges, seepage slopes, stream banks |
Elevation | 100-1000 m (300-3300 ft) | 10-2700 m (0-8900 ft) |
Distribution |
AR; OK |
AK; CA; ID; MT; OR; WA; WY; AB; BC; NT
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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.) |
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Source | FNA vol. 8, p. 61. | FNA vol. 8, p. 58. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga palmeri, Saxifraga virginiensis var. subintegra | Saxifraga ferruginea, Saxifraga ferruginea var. macounii, Saxifraga ferruginea var. newcombei, Saxifraga ferruginea var. vreelandii, Saxifraga newcombei |
Name authority | Bush: Amer. Midl. Naturalist 11: 221. 1928 , | (Graham) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
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