Micranthes virginiensis |
Micranthes calycina |
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early saxifrage, early small-flower-saxifrage, saxifrage de virginie, Virginia saxifrage |
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Habit | Plants solitary or in clumps, with bulbils on caudices. | Plants solitary or in clusters, 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 ± distinct, flattened, (0.5–)1–3.5 cm; blade rhombic or fan-shaped, sometimes nearly round, (1–)1.5–3.5 cm, ± fleshy, base attenuate to ± cuneate, margins 7–11-toothed in distal 1/2–2/3 (teeth 1–3 mm), sparsely ciliate, surfaces glabrous. |
Inflorescences | 30+-flowered, (flowers sometimes secund), very open, lax, ± flat-topped thyrses, 6–50 cm, proximally hairy, distally densely purple-tipped stipitate-glandular. |
3–15-flowered, usually racemiform, sometimes paniculiform thyrses, 3–15 cm, axis glabrous or sparsely long-hairy, branches ± densely (rarely sparsely) long tangled-hairy; (bracts reduced). |
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 ovate; petals white to cream, sometimes purplish, not spotted, linear to narrowly elliptic, not clawed, 2–4 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths, (conic); ovary ± 1/2 inferior. |
Capsules | green to purplish, folliclelike. |
purple-black, valvate. |
2n | = 20 (+ 0–6 supernumeraries), 38. |
= 24. |
Micranthes virginiensis |
Micranthes calycina |
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Phenology | Flowering spring. | Flowering summer. |
Habitat | Rocky hillsides, cliffs and shaded rock outcrops, stream banks, wooded slopes | Flushes, stream banks, tundra, around late snowbeds, screes |
Elevation | 0-1500 m (0-4900 ft) | (0-)30-1700 m ((0-)100-5600 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
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AK; e Asia (Russian Far East) |
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.) |
Micranthes calycina is found mostly in western Alaska, in the north from the Seward Peninsula to the Brooks Range west of Atigun Pass, and in the south from Unimak Island and the Ahklum Mountains to the Saint Elias Mountains. It is also present on the main Bering Sea islands, but apparently not on the Aleutians west of Unimak. Plants of this species sometimes have been misidentified as M. davurica (Willdenow) Small, a species restricted to eastern Siberia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 61. | FNA vol. 8, p. 59. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga virginiensis | Saxifraga calycina, Saxifraga davurica subsp. grandipetala, Saxifraga davurica var. grandipetala |
Name authority | (Michaux) Small: Fl. S.E. U.S., 501. 1903 , | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1020. (2007) |
Web links |