Micranthes texana |
Micranthes petiolaris |
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Texas saxifrage |
Michaux's saxifrage |
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Habit | Plants solitary or in clumps, with bulbils on caudices. | Plants solitary or tufted, with bulbils on caudices. |
Leaves | basal; petiole flattened, 1–3 cm; blade broadly ovate to oblong, 1.5–3 cm, ± leathery, base ± abruptly attenuate, margins subentire to slightly crenate, eciliate, surfaces glabrate to sparsely hairy. |
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. |
Inflorescences | 20+-flowered, branched, ± capitate thyrses, 10–15 cm, hairy, sometimes purple-tipped stipitate-glandular. |
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). |
Flowers | sepals erect, ovate; petals white, not spotted, ± obovate, clawed, 2–3.5 mm, ± equaling sepals; filaments linear, flattened; pistils 3+, connate to 1/2 their lengths; ovary 1/2+ inferior, appearing more superior in fruit. |
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. |
Capsules | reddish to purplish, valvate. |
green to yellow, sometimes purple tinged, valvate |
Micranthes texana |
Micranthes petiolaris |
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Phenology | Flowering late winter–spring. | Flowering late spring–early autumn. |
Habitat | Sandy flats, rocky, open, wooded areas, granite outcrops | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock |
Elevation | 50-500 m (200-1600 ft) | 500-2100 m (1600-6900 ft) |
Distribution |
AR; GA; KS; LA; MO; OK; TX |
GA; KY; MD; NC; SC; TN; VA; WV
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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. 68. | FNA vol. 8, p. 58. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga texana | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris |
Name authority | (Buckley) Small: Fl. S.E. U.S., 501. 1903 , | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , |
Web links |