Micranthes apetala |
Micranthes integrifolia |
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tiny swamp saxifrage, western swamp saxifrage |
Columbian saxifrage, grassland saxifrage, northwestern saxifrage, smooth leaf saxifrage, swamp saxifrage, whole-leaf saxifrage |
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Habit | Plants solitary or in clusters, with bulbils on caudices, or short-rhizomatous. | Plants solitary or in clumps, (sometimes gynodioecious), often with bulbils on caudices, or short-rhizomatous. |
Leaves | basal; petiole flattened, 0.5–3 cm; blade ± ovate, 2–5 cm, ± fleshy, base attenuate, margins entire or crenulate, eciliate, surfaces hairy. |
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. |
Inflorescences | 10–25-flowered, congested, glomerate thyrses, 4–15 cm, pink- to purple-tipped stipitate-glandular (hairs uniseriate). |
(15–)20+-flowered, open to ± congested, conic thyrses, (usually branched, lateral cymules ± open), 12–35 cm, densely pink- to purple-tipped stipitate-glandular. |
Flowers | sepals erect to ascending, ovate; petals absent, sometimes 1–5, white to greenish white, not spotted, linear to oblong, clawed, 1–2 mm, much shorter than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
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. |
Capsules | reddish or purplish, folliclelike. |
reddish or purplish, folliclelike. |
2n | = 38. |
= 38. |
Micranthes apetala |
Micranthes integrifolia |
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Phenology | Flowering early spring–summer. | Flowering late winter–spring. |
Habitat | Vernally moist meadows, wet depressions on mountain slopes | Vernally moist meadows, grassy slopes, rock outcrops |
Elevation | 600-2800 m (2000-9200 ft) | 0-1800 m (0-5900 ft) |
Distribution |
ID; MT; OR; WA
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CA; OR; WA; BC
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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.) |
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Source | FNA vol. 8, p. 68. | FNA vol. 8, p. 67. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga apetala, Saxifraga integrifolia var. apetala | Saxifraga integrifolia |
Name authority | (Piper) Small: in N. L. Britton et al., N. Amer. Fl. 22: 135. 1905 , | (Hooker) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. 1905 , |
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