Micranthes lyallii |
Micranthes ferruginea |
|
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Lyall's saxifrage, red-stem saxifrage |
Alaska saxifrage, rusty hair saxifrage, rusty saxifrage |
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Habit | Plants solitary or sometimes mat-forming, rhizomatous. | Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. |
Leaves | basal; petiole rounded to flattened, 2–10 cm; blade spatulate to obovate, 0.8–8 cm, thin, base cuneate to slightly attenuate, margins serrate to dentate, eciliate or sparsely glandular-ciliate, surfaces abaxially glabrous, adaxially sparsely 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 | usually 10–15-flowered, lax, cylindric thyrses, (red), (4–)7–30 cm, sparsely purple-tipped stipitate-glandular. |
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 reflexed, oblong to elliptic; petals white, each with 2 basal yellowish green spots, elliptic to round, clawed, 2–5.5 mm, longer than sepals; filaments club-shaped, (to 6 mm); pistils connate 1/2+ their lengths; 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 to yellow, distal 1/2 purple, ± folliclelike, (basally connate). |
green or yellow, sometimes purple tinged, or partly purple, valvate. |
2n | = ca. 56, 58. |
= 20. |
Micranthes lyallii |
Micranthes ferruginea |
|
Phenology | Flowering summer–early autumn. | Flowering summer–early autumn. |
Habitat | Wet, rocky meadows, mountain to alpine streamsides | Wet ledges, seepage slopes, stream banks |
Elevation | 800-4000 m (2600-13100 ft) | 10-2700 m (0-8900 ft) |
Distribution |
AK; ID; MT; WA; AB; BC; NT; YT
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AK; CA; ID; MT; OR; WA; WY; AB; BC; NT
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Discussion | Although they have nearly disjunct sets of populations, the subspecies of Micranthes lyallii are difficult to distinguish from each other. The more northern plants tend to be larger with wider leaves and often have been called Saxifraga lyallii subsp. or var. hultenii. Apparent hybrids with M. odontoloma occur in Alberta, British Columbia, and northern Idaho, and near Glacier National Park, Montana. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 8, p. 57. | FNA vol. 8, p. 58. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga lyallii, Saxifraga lyallii subsp. hultenii, Saxifraga lyallii var. hultenii | Saxifraga ferruginea, Saxifraga ferruginea var. macounii, Saxifraga ferruginea var. newcombei, Saxifraga ferruginea var. vreelandii, Saxifraga newcombei |
Name authority | (Engler) Small: in N. L. Britton et al., N. Amer. Fl. 22: 143. 1905 , | (Graham) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
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