Micranthes marshallii |
Micranthes petiolaris |
|
---|---|---|
Idaho saxifrage, Marshall's saxifrage |
Michaux's saxifrage |
|
Habit | Plants in groups or sometimes mat-forming, rhizomatous. | Plants solitary or tufted, with bulbils on caudices. |
Leaves | basal; petiole flattened, 3–15 cm; blade ovate, 1–5 cm, ± fleshy, base attenuate, margins shallowly crenate-serrate (teeth ca. 2 mm), eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrate adaxially. |
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 | 15–50+-flowered, open, lax thyrses, 20–40 cm, 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 reflexed, lanceolate to oblong; petals white, with 2 basal yellow spots (often faded when dried), ovate, clawed, 1.5–4.5 mm, longer than sepals; filaments strongly club-shaped, sometimes petaloid (short-clawed, equaling petals); pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
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 | greenish to reddish purple, folliclelike. |
green to yellow, sometimes purple tinged, valvate |
2n | = 20. |
|
Micranthes marshallii |
Micranthes petiolaris |
|
Phenology | Flowering spring. | Flowering late spring–early autumn. |
Habitat | Deeply shaded watercourses, stream banks, seeps | Wet ledges, boulderfields, and rocky slopes, usually in thin soil over rock |
Elevation | 100-1000 m (300-3300 ft) | 500-2100 m (1600-6900 ft) |
Distribution |
CA; OR
|
GA; KY; MD; NC; SC; TN; VA; WV
|
Discussion | Micranthes petiolaris (Rafinesque) Brouillet & Gornall is an isonym. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 8, p. 63. | FNA vol. 8, p. 58. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga marshallii | Hexaphoma petiolaris, Saxifraga michauxii, Saxifraga petiolaris |
Name authority | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , | (Rafinesque) Bush: Amer. Midl. Naturalist 11: 225. 1928 , |
Web links |