Micranthes fragosa |
Micranthes caroliniana |
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brittle-leaf saxifrage, Clayton's saxifrage, peak saxifrage |
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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 flattened, 1–10 cm; blade broadly ovate to elliptic, 2–14 cm, thin to slightly fleshy, base truncate, margins deeply dentate (teeth 2+ mm), sparsely glandular-ciliate, surfaces densely white-hairy. |
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+-flowered, open, lax thyrses, 10–50 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, oblong; petals white, with 2 basal yellow spots (distinct even in dried material), ovate to elliptic, short-clawed, 2–4 mm, much longer than sepals; filaments elongate, (longer than petals), club-shaped; pistils distinct almost to base; ovary superior. |
Capsules | green or reddish purple, folliclelike. |
greenish to yellow, folliclelike. |
2n | = 20, 38. |
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Micranthes fragosa |
Micranthes caroliniana |
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Phenology | Flowering spring–summer. | Flowering spring. |
Habitat | Wet, mossy cliffs, unstable slopes, often near watercourses | Moist soil at bases of vertical or overhanging rock outcrops, seeps |
Elevation | 100-2600 m [300-8500 ft] | 500-1200 m [1600-3900 ft] |
Distribution |
ID; OR; WA
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NC; TN; VA; WV |
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. 61. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga fragosa, Saxifraga claytoniifolia, Saxifraga fragosa subsp. claytoniifolia, Saxifraga integrifolia var. claytoniifolia, Saxifraga nidifica var. claytoniifolia | Saxifraga caroliniana |
Name authority | (Suksdorf ex Small) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. (1905) | (A. Gray) Small: in N. L. Britton et al., N. Amer. Fl. 22: 146. (1905) |
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