Micranthes howellii |
Micranthes foliolosa |
|
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Howell's saxifrage |
leafy stem saxifrage, naked-bulbil small-flower-saxifrage, saxifrage à bulbilles |
|
Habit | Plants solitary or in groups, with bulbils on caudices. | Plants solitary or tufted, with bulbils on caudices. |
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 oblanceolate, 6–15(–30) cm, ± fleshy, base cuneate, margins subentire, sometimes 1–3-toothed distally, eciliate or sparsely ciliate, surfaces glabrate. |
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(–5+)-flowered, (proximal flowers replaced by bulbils), narrow, branched, sometimes ± open, cylindric thyrses, sometimes solitary flowers, 5–15 cm, glabrous or sparsely purple-tipped stipitate-glandular. (Pedicels erect to ascending.) Flowers: sepals reflexed, lanceolate; petals white, each with 1–2 basal yellow spots, lanceolate, clawed, 3–8 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior, (to 1/3 adnate to hypanthium). |
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. |
|
Capsules | purple, valvate. |
green to purplish, valvate. |
2n | = 56. |
|
Micranthes howellii |
Micranthes foliolosa |
|
Phenology | Flowering early spring–early summer. | Flowering late summer. |
Habitat | Wet, rocky ledges and crevices | Mossy tundra near streams and flushes, wet, rocky slopes, snowbeds |
Elevation | 0-900 m (0-3000 ft) | 0-1800 m (0-5900 ft) |
Distribution |
CA; OR
|
AK; CO; ME; NL; NT; NU; QC; YT; Greenland; n Europe; n Asia |
Source | FNA vol. 8, p. 63. | FNA vol. 8, p. 57. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga howellii | Saxifraga foliolosa, Saxifraga foliolosa var. multiflora, Saxifraga stellaris subsp. comosa, Saxifraga stellaris var. comosa |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) | (R. Brown) Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
Web links |