Micranthes petiolaris

(Rafinesque) Bush

Amer. Midl. Naturalist 11: 225. 1928 ,.

Common names: Michaux’s saxifrage
Basionym: Hexaphoma petiolaris Rafinesque Fl. Tellur. 2: 67. 1837
Synonyms: Saxifraga michauxii Britton Saxifraga petiolaris (Rafinesque) Bush
Treatment appears in FNA Volume 8. Treatment on page 58. Mentioned on page 49, 50, 53.

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. 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). 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. Capsules green to yellow, sometimes purple tinged, valvate


Phenology: Flowering late spring–early autumn.
Habitat: Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock
Elevation: 500-2100 m

Distribution

V8 102-distribution-map.gif

Ga., Ky., Md., N.C., S.C., Tenn., Va., W.Va.

Discussion

Micranthes petiolaris (Rafinesque) Brouillet & Gornall is an isonym.

Selected References

None.

Lower Taxa

None.
... more about "Micranthes petiolaris"
Luc Brouillet +  and Patrick E. Elvander† +
(Rafinesque) Bush +
Hexaphoma petiolaris +
Michaux’s saxifrage +
Ga. +, Ky. +, Md. +, N.C. +, S.C. +, Tenn. +, Va. +  and W.Va. +
500-2100 m +
Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock +
Flowering late spring–early autumn. +
Amer. Midl. Naturalist +
Saxifraga michauxii +  and Saxifraga petiolaris +
Micranthes petiolaris +
Micranthes +
species +