Micranthes petiolaris |
Micranthes spicata |
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Michaux's saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or tufted, short, thick-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 rounded, 4–15 cm; blade round, ovate, or reniform, 3–15 cm, thin, base cordate, margins serrate to dentate, ciliate, surfaces hairy to glabrate. |
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, congested, spikelike thyrses, 15–50(–70) cm, tangled, pink- to 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 to ovate; petals cream to yellowish, not spotted, oblong, not clawed, 3–4.5 mm, longer than sepals; filaments narrowly club-shaped; pistils connate at least 1/2 their lengths; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green to yellow, sometimes purple tinged, valvate |
green, purplish tinged, ± folliclelike, (basally connate). |
Micranthes petiolaris |
Micranthes spicata |
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Phenology | Flowering late spring–early autumn. | Flowering summer. |
Habitat | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock | Wet tundra, heaths, moist, rocky areas, streamsides |
Elevation | 500-2100 m (1600-6900 ft) | 0-1700 m (0-5600 ft) |
Distribution |
GA; KY; MD; NC; SC; TN; VA; WV
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AK; YT |
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. 57. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris | Saxifraga spicata |
Name authority | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , | (D. Don) Small: in N. L. Britton et al., N. Amer. Fl. 22: 146. (1905) |
Web links |