Micranthes marshallii |
Micranthes fragosa |
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Idaho saxifrage, Marshall's saxifrage |
brittle-leaf saxifrage, Clayton's saxifrage, peak saxifrage |
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Habit | Plants in groups or sometimes mat-forming, rhizomatous. | Plants often mat-forming, long, thin-rhizomatous. |
Leaves | 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. |
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. |
Inflorescences | 15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular. |
30+-flowered, (flowers sometimes almost secund), open, lax, conic thyrses with ± open cymules on lateral branches, 20–50 cm, purple-tipped stipitate-glandular. |
Flowers | 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). |
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 | greenish to reddish purple, folliclelike. |
green or reddish purple, folliclelike. |
2n | = 20. |
= 20, 38. |
Micranthes marshallii |
Micranthes fragosa |
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Phenology | Flowering spring. | Flowering spring–summer. |
Habitat | Deeply shaded watercourses, stream banks, seeps | Wet, mossy cliffs, unstable slopes, often near watercourses |
Elevation | 100-1000 m (300-3300 ft) | 100-2600 m (300-8500 ft) |
Distribution |
CA; OR
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ID; OR; WA
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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. 63. | FNA vol. 8, p. 68. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga marshallii | Saxifraga fragosa, Saxifraga claytoniifolia, Saxifraga fragosa subsp. claytoniifolia, Saxifraga integrifolia var. claytoniifolia, Saxifraga nidifica var. claytoniifolia |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , | (Suksdorf ex Small) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. (1905) |
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