Micranthes howellii |
Micranthes stellaris |
|
---|---|---|
Howell's saxifrage |
saxifrage étoilée, starry saxifrage |
|
Habit | Plants solitary or in groups, with bulbils on caudices. | Plants tufted or mat-forming, with ± branched caudices or stolonlike rhizomes. |
Leaves | basal; petiole flattened, 1–4 cm; blade oblong to narrowly ovate, 1–2(–3) cm, ± fleshy, base attenuate, margins sharply serrate, eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrous adaxially. |
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 | 5–10(–20)-flowered, very open, lax, ± flat-topped cymes or thyrses, 5–10(–20) cm, glabrate to sparsely purple-tipped stipitate-glandular; (bracts glabrous). |
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 strongly reflexed, elliptic, (surfaces glabrous); petals white, not spotted, obovate to elliptic, clawed, 2.5–4.5 mm, longer than sepals; filaments linear, flattened; pistils distinct almost to base; ovary ± superior. |
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 | purple, valvate. |
green to purple, valvate. |
2n | = 28. |
|
Micranthes howellii |
Micranthes stellaris |
|
Phenology | Flowering early spring–early summer. | Flowering summer. |
Habitat | Wet, rocky ledges and crevices | Mossy tundra near streams, rocky, gravelly seepage areas |
Elevation | 0-900 m (0-3000 ft) | 0-500 m (0-1600 ft) |
Distribution |
CA; OR
|
LB; NU; QC; Greenland; Europe |
Discussion | 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. 63. | FNA vol. 8, p. 57. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga howellii | Saxifraga stellaris |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) | (Linnaeus) Galasso: Atti Soc. Ital. Sci. Nat. Mus. Civico Storia Nat. Milano 146: 231. (2005) |
Web links |