Micranthes integrifolia |
Micranthes unalaschcensis |
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Columbian saxifrage, grassland saxifrage, northwestern saxifrage, smooth leaf saxifrage, swamp saxifrage, whole-leaf saxifrage |
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Habit | Plants solitary or in clumps, (sometimes gynodioecious), often with bulbils on caudices, or short-rhizomatous. | Plants solitary or tufted, with bulbils on caudices or rhizomatous. |
Leaves | basal; petiole flattened, 0.5–4 cm; blade narrowly to broadly ovate, 2–7 cm, ± leathery, base attenuate, margins entire or minutely denticulate, usually ciliate, surfaces sparsely to moderately hairy. |
basal; petiole flattened, 1–2 cm; blade broadly obovate to round, 1–3.5 cm, ± fleshy, base cuneate, margins distally toothed, sparsely ciliate, surfaces glabrous. |
Inflorescences | (15–)20+-flowered, open to ± congested, conic thyrses, (usually branched, lateral cymules ± open), 12–35 cm, densely pink- to purple-tipped stipitate-glandular. |
2–10-flowered, open thyrses, racemiform distally, sometimes solitary flowers, 3–15 cm, tangled-hairy. |
Flowers | sepals spreading to slightly reflexed, ovate; petals white, not spotted, obovate, clawed, 2–4 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
sepals reflexed, ovate; petals white to cream or pinkish, not spotted, elliptic to oblong, ± clawed, 3.5–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary at least 1/2 inferior. |
Capsules | reddish or purplish, folliclelike. |
dark purple, valvate. |
2n | = 38. |
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Micranthes integrifolia |
Micranthes unalaschcensis |
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Phenology | Flowering late winter–spring. | Flowering summer. |
Habitat | Vernally moist meadows, grassy slopes, rock outcrops | Tundra, flushes, stream banks, slopes |
Elevation | 0-1800 m (0-5900 ft) | 0-600 m (0-2000 ft) |
Distribution |
CA; OR; WA; BC
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AK; e Asia (Russian Far East) |
Discussion | The occasional occurrence of sterile pollen has been noted in this as well as in other species of Micranthes (as Saxifraga, K. I. Beamish 1961). Some populations exhibit gynodioecism (P. E. Elvander 1982). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The ovaries and capsules of Micranthes unalaschensis are ovoid, thicker and plumper than those of M. calycina and M. razshivinii, which are conic (E. Hultén 1968). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 67. | FNA vol. 8, p. 60. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga integrifolia | Saxifraga unalaschensis, Saxifraga calycina subsp. unalaschensis, Saxifraga davurica var. unalaschensis |
Name authority | (Hooker) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. 1905 , | (Sternberg) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 1: 1022. (2007) |
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