Micranthes virginiensis |
Micranthes marshallii |
|
---|---|---|
early saxifrage, early small-flower-saxifrage, saxifrage de virginie, Virginia saxifrage |
Idaho saxifrage, Marshall's saxifrage |
|
Habit | Plants solitary or in clumps, with bulbils on caudices. | Plants in groups or sometimes mat-forming, rhizomatous. |
Leaves | basal; petiole flattened, 1–9 cm; blade ovate to elliptic, 2–8 cm, ± fleshy, base attenuate, margins irregularly crenate to serrate, ciliate, surfaces sparsely to ± densely stipitate-glandular and tangled, reddish brown-hairy, adaxially glabrescent. |
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. |
Inflorescences | 30+-flowered, (flowers sometimes secund), very open, lax, ± flat-topped thyrses, 6–50 cm, proximally hairy, distally densely purple-tipped stipitate-glandular. |
15–50+-flowered, open, lax thyrses, 20–40 cm, purple-tipped stipitate-glandular. |
Flowers | sepals erect to ascending (even in fruit), ovate to triangular; petals white, not spotted, broadly oblong to elliptic, not or rarely slightly clawed, 3–6 mm, 2+ times as long as sepals; filaments linear, flattened; pistils distinct almost to base; ovary ± superior, (to 1/3 adnate hypanthium). |
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). |
Capsules | green to purplish, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 20 (+ 0–6 supernumeraries), 38. |
= 20. |
Micranthes virginiensis |
Micranthes marshallii |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Rocky hillsides, cliffs and shaded rock outcrops, stream banks, wooded slopes | Deeply shaded watercourses, stream banks, seeps |
Elevation | 0-1500 m (0-4900 ft) | 100-1000 m (300-3300 ft) |
Distribution |
AL; AR; CT; DC; GA; IL; IN; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NH; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WV; MB; NB; ON; QC
|
CA; OR
|
Discussion | Also reported for Micranthes virginiensis is 2n = 28; D. E. Soltis (1983) documented zero to six supernumerary chromosomes in this species and speculated that this report may have included eight supernumeraries. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 8, p. 61. | FNA vol. 8, p. 63. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga virginiensis | Saxifraga marshallii |
Name authority | (Michaux) Small: Fl. S.E. U.S., 501. 1903 , | (Greene) Small: in N. L. Britton et al., N. Amer. Fl. 22: 145. 1905 , |
Web links |