Micranthes fragosa |
Micranthes foliolosa |
|
---|---|---|
brittle-leaf saxifrage, Clayton's saxifrage, peak saxifrage |
leafy stem saxifrage, naked-bulbil small-flower-saxifrage, saxifrage à bulbilles |
|
Habit | Plants often mat-forming, long, thin-rhizomatous. | Plants solitary or tufted, with bulbils on caudices. |
Leaves | basal; petiole flattened, 4–10 cm; blade broadly ovate to deltate, 4–8(–10) cm, fleshy, base attenuate, margins entire or minutely denticulate, ciliate, surfaces glabrate to sparsely hairy. |
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 | 30+-flowered, (flowers sometimes almost secund), open, lax, conic thyrses with ± open cymules on lateral branches, 20–50 cm, purple-tipped stipitate-glandular. |
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 spreading to slightly reflexed, ovate to deltate; petals white, not spotted, obovate, clawed, 2–3 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior, appearing more superior in fruit. |
|
Capsules | green or reddish purple, folliclelike. |
green to purplish, valvate. |
2n | = 20, 38. |
= 56. |
Micranthes fragosa |
Micranthes foliolosa |
|
Phenology | Flowering spring–summer. | Flowering late summer. |
Habitat | Wet, mossy cliffs, unstable slopes, often near watercourses | Mossy tundra near streams and flushes, wet, rocky slopes, snowbeds |
Elevation | 100-2600 m [300-8500 ft] | 0-1800 m [0-5900 ft] |
Distribution |
ID; OR; WA
|
AK; CO; ME; NL; NT; NU; QC; YT; Greenland; n Europe; n Asia
|
Discussion | Micranthes fragosa is restored to specific status here because a review of its differences with M. nidifica shows it to be more distinctive than previously thought, and for consistency in the application of criteria for species recognition within the rest of the genus. In the southernmost part of its range, M. fragosa converges in appearance with M. californica. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 8, p. 68. | FNA vol. 8, p. 57. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga fragosa, Saxifraga claytoniifolia, Saxifraga fragosa subsp. claytoniifolia, Saxifraga integrifolia var. claytoniifolia, Saxifraga nidifica var. claytoniifolia | Saxifraga foliolosa, Saxifraga foliolosa var. multiflora, Saxifraga stellaris subsp. comosa, Saxifraga stellaris var. comosa |
Name authority | (Suksdorf ex Small) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. (1905) | (R. Brown) Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , |
Web links |
|