Micranthes petiolaris |
Micranthes caroliniana |
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Michaux's saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or tufted, with bulbils on caudices. |
Leaves | basal; petiole somewhat flattened, 2–6 cm; blade oblanceolate, 2–12 cm, thin, basecuneate to ± attenuate, margins usually 15+-toothed (teeth large, lobelike), densely long glandular-ciliate, surfaces 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, very open, lax thyrses, (flowers rarely replaced by bulbils), 10–40 cm, densely tangled, purple-tipped stipitate-glandular; (bracts leaflike, gradually reduced distally). |
15+-flowered, open, lax thyrses, 10–50 cm, purple-tipped stipitate-glandular. |
Flowers | slightly bilaterally symmetric; sepals reflexed, oblong to elliptic; petals white, 3 with 2 basal yellow spots, 2 without spots, oblanceolate to spatulate, clawed, 3–4.5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior. |
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 to yellow, sometimes purple tinged, valvate |
greenish to yellow, folliclelike. |
Micranthes petiolaris |
Micranthes caroliniana |
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Phenology | Flowering late spring–early autumn. | Flowering spring. |
Habitat | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock | Moist soil at bases of vertical or overhanging rock outcrops, seeps |
Elevation | 500-2100 m (1600-6900 ft) | 500-1200 m (1600-3900 ft) |
Distribution |
GA; KY; MD; NC; SC; TN; VA; WV
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NC; TN; VA; WV |
Discussion | Micranthes petiolaris (Rafinesque) Brouillet & Gornall is an isonym. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 58. | FNA vol. 8, p. 61. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris | Saxifraga caroliniana |
Name authority | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , | (A. Gray) Small: in N. L. Britton et al., N. Amer. Fl. 22: 146. (1905) |
Web links |