Micranthes fragosa |
Micranthes careyana |
|
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brittle-leaf saxifrage, Clayton's saxifrage, peak saxifrage |
Carey's saxifrage |
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Habit | Plants often mat-forming, long, thin-rhizomatous. | Plants often mat-forming, with extensive rhizomes. |
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, 1–7 cm; blade rounded or broadly ovate to oblong, 1–7 cm, thin, base truncate, margins coarsely serrate to dentate, sparsely ciliate, surfaces sparsely to ± densely tangled, reddish brown-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. |
40+-flowered, lax, open thyrses, 10–40(–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 spreading, broadly ovate; petals white, sometimes some with 2 faint, basal yellow spots (sometimes fading upon drying), narrowly ovate to elliptic, clawed, 2–4(–5) mm, 2+ times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green or reddish purple, folliclelike. |
green, ± purple tinged, folliclelike. |
2n | = 20, 38. |
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Micranthes fragosa |
Micranthes careyana |
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Phenology | Flowering spring–summer. | Flowering spring–early summer. |
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] | 500-1600 m [1600-5200 ft] |
Distribution |
ID; OR; WA
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AL; GA; KY; 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.) |
Micranthes careyana is very similar to M. caroliniana; both are in need of study. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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 careyana, Saxifraga tennesseensis |
Name authority | (Suksdorf ex Small) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. (1905) | (A. Gray) Small: Fl. S.E. U.S., 501. 1903 , |
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