Micranthes fragosa |
Micranthes marshallii |
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brittle-leaf saxifrage, Clayton's saxifrage, peak saxifrage |
Idaho saxifrage, Marshall's saxifrage |
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Habit | Plants often mat-forming, long, thin-rhizomatous. | Plants in groups or sometimes mat-forming, rhizomatous. |
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 flattened, 3–15 cm; blade ovate, 1–5 cm, ± fleshy, base attenuate, margins shallowly crenate-serrate (teeth ca. 2 mm), eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrate adaxially. |
Inflorescences | 30+-flowered, (flowers sometimes almost secund), open, lax, conic thyrses with ± open cymules on lateral branches, 20–50 cm, purple-tipped stipitate-glandular. |
15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular. |
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. |
sepals reflexed, lanceolate to oblong; petals white, with 2 basal yellow spots (often faded when dried), ovate, clawed, 1.5–4.5 mm, longer than sepals; filaments strongly club-shaped, sometimes petaloid (short-clawed, equaling petals); pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green or reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 20, 38. |
= 20. |
Micranthes fragosa |
Micranthes marshallii |
|
Phenology | Flowering spring–summer. | Flowering spring. |
Habitat | Wet, mossy cliffs, unstable slopes, often near watercourses | Deeply shaded watercourses, stream banks, seeps |
Elevation | 100-2600 m [300-8500 ft] | 100-1000 m [300-3300 ft] |
Distribution |
ID; OR; WA
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CA; OR
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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.) |
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Source | FNA vol. 8, p. 68. | FNA vol. 8, p. 63. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga fragosa, Saxifraga claytoniifolia, Saxifraga fragosa subsp. claytoniifolia, Saxifraga integrifolia var. claytoniifolia, Saxifraga nidifica var. claytoniifolia | Saxifraga marshallii |
Name authority | (Suksdorf ex Small) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. (1905) | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , |
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