Micranthes petiolaris |
Micranthes apetala |
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Michaux's saxifrage |
tiny swamp saxifrage, western swamp saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or in clusters, with bulbils on caudices, or short-rhizomatous. |
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, 0.5–3 cm; blade ± ovate, 2–5 cm, ± fleshy, base attenuate, margins entire or crenulate, eciliate, surfaces 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). |
10–25-flowered, congested, glomerate thyrses, 4–15 cm, pink- to purple-tipped stipitate-glandular (hairs uniseriate). |
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 erect to ascending, ovate; petals absent, sometimes 1–5, white to greenish white, not spotted, linear to oblong, clawed, 1–2 mm, much shorter than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
Capsules | green to yellow, sometimes purple tinged, valvate |
reddish or purplish, folliclelike. |
2n | = 38. |
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Micranthes petiolaris |
Micranthes apetala |
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Phenology | Flowering late spring–early autumn. | Flowering early spring–summer. |
Habitat | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock | Vernally moist meadows, wet depressions on mountain slopes |
Elevation | 500-2100 m (1600-6900 ft) | 600-2800 m (2000-9200 ft) |
Distribution |
GA; KY; MD; NC; SC; TN; VA; WV
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ID; MT; OR; WA
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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. 68. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris | Saxifraga apetala, Saxifraga integrifolia var. apetala |
Name authority | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , | (Piper) Small: in N. L. Britton et al., N. Amer. Fl. 22: 135. 1905 , |
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