Micranthes ferruginea |
Micranthes caroliniana |
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Alaska saxifrage, rusty hair saxifrage, rusty saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. | Plants solitary or tufted, 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, 1–10 cm; blade broadly ovate to elliptic, 2–14 cm, thin to slightly fleshy, base truncate, margins deeply dentate (teeth 2+ mm), sparsely glandular-ciliate, surfaces densely white-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). |
15+-flowered, open, lax thyrses, 10–50 cm, 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 reflexed, oblong; petals white, with 2 basal yellow spots (distinct even in dried material), ovate to elliptic, short-clawed, 2–4 mm, much longer than sepals; filaments elongate, (longer than petals), club-shaped; pistils distinct almost to base; ovary superior. |
Capsules | green or yellow, sometimes purple tinged, or partly purple, valvate. |
greenish to yellow, folliclelike. |
2n | = 20. |
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Micranthes ferruginea |
Micranthes caroliniana |
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Phenology | Flowering summer–early autumn. | Flowering spring. |
Habitat | Wet ledges, seepage slopes, stream banks | Moist soil at bases of vertical or overhanging rock outcrops, seeps |
Elevation | 10-2700 m (0-8900 ft) | 500-1200 m (1600-3900 ft) |
Distribution |
AK; CA; ID; MT; OR; WA; WY; AB; BC; NT
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NC; TN; VA; WV |
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. 58. | FNA vol. 8, p. 61. |
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 caroliniana |
Name authority | (Graham) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , | (A. Gray) Small: in N. L. Britton et al., N. Amer. Fl. 22: 146. (1905) |
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