Micranthes lyallii |
Micranthes stellaris |
|
---|---|---|
Lyall's saxifrage, red-stem saxifrage |
saxifrage étoilée, starry saxifrage |
|
Habit | Plants solitary or sometimes mat-forming, rhizomatous. | Plants tufted or mat-forming, with ± branched caudices or stolonlike rhizomes. |
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 ± absent; blade obovate to elliptic, 1–5 cm, ± fleshy, base cuneate, margins 1–3-toothed in distal 1/2, ciliate, surfaces hairy. |
Inflorescences | usually 10–15-flowered, lax, cylindric thyrses, (red), (4–)7–30 cm, sparsely purple-tipped stipitate-glandular. |
2–10-flowered, open, lax cymes, sometimes solitary flowers, (all or some flowers replaced with bulbils, bulbils sometimes absent), 5–20 cm, sparsely to moderately purple-tipped stipitate-glandular. |
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). |
sepals reflexed, narrowly elliptic to lanceolate; petals white, each with 1–2 basal yellow spots, lanceolate, clawed, 3–8 mm (2 often slightly larger), 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 to purple, valvate. |
2n | = ca. 56, 58. |
= 28. |
Micranthes lyallii |
Micranthes stellaris |
|
Phenology | Flowering summer–early autumn. | Flowering summer. |
Habitat | Wet, rocky meadows, mountain to alpine streamsides | Mossy tundra near streams, rocky, gravelly seepage areas |
Elevation | 800-4000 m (2600-13100 ft) | 0-500 m (0-1600 ft) |
Distribution |
AK; ID; MT; WA; AB; BC; NT; YT
|
LB; NU; QC; Greenland; Europe |
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.) |
Micranthes stellaris is amphi-Atlantic. In Nunavut, it is known only from Baffin Island. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 57. | FNA vol. 8, p. 57. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga lyallii, Saxifraga lyallii subsp. hultenii, Saxifraga lyallii var. hultenii | Saxifraga stellaris |
Name authority | (Engler) Small: in N. L. Britton et al., N. Amer. Fl. 22: 143. 1905 , | (Linnaeus) Galasso: Atti Soc. Ital. Sci. Nat. Mus. Civico Storia Nat. Milano 146: 231. (2005) |
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