Micranthes idahoensis |
Micranthes rufidula |
|
---|---|---|
Idaho saxifrage |
rusty-hair saxifrage |
|
Habit | Plants solitary or tufted, with bulbils on caudices. | Plants solitary or in groups, with bulbils on caudices, or rhizomatous. |
Leaves | basal; petiole flattened, 1–5 cm; blade ovate to elliptic, 1–4 cm, ± fleshy, base attenuate, margins shallowly serrate to dentate (teeth usually to 1 mm), sparsely ciliate, surfaces tangled, reddish brown-hairy abaxially, glabrate adaxially. |
basal; petiole flattened, 4–8 cm; blade ovate to elliptic, 1–4 cm, fleshy, base attenuate to ± truncate, margins serrate (15–30- toothed), eciliate, surfaces densely tangled, reddish brown-hairy abaxially, glabrous adaxially. |
Inflorescences | 15+-flowered, open thyrses, (flowers ± crowded at tips, becoming more open in fruit), 10–40 cm, purple-tipped stipitate-glandular. |
15+-flowered, open, flat-topped thyrses, 5–20 cm, purple-tipped stipitate-glandular; (bracts often tangled brown-hairy). |
Flowers | sepals reflexed, ovate to oblong; petals white, with 2 basal yellow spots (often faded when dried), elliptic to ovate, clawed to nearly not clawed, 1–3.5 mm, ± equaling sepals; filaments club-shaped, not petaloid, (equaling petals); pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
sepals spreading, ovate, (often tangled brown-hairy); petals white, not spotted, ovate to elliptic, clawed, 2–4 mm, longer than sepals; filaments linear, flattened to slightly club-shaped; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green to reddish purple, folliclelike. |
greenish to reddish purple, folliclelike. |
2n | = 20. |
= 20, 38, 56, 58. |
Micranthes idahoensis |
Micranthes rufidula |
|
Phenology | Flowering spring–early summer. | Flowering late winter–summer. |
Habitat | Open ledges and slopes | Wet to dry, rocky ledges |
Elevation | 500-2500 m (1600-8200 ft) | 0-3000 m (0-9800 ft) |
Distribution |
ID; MT; OR; WA
|
CA; OR; WA; BC
|
Discussion | Micranthes idahoensis appears to hybridize with M. occidentalis where their ranges overlap. Intermediates are abundant in some populations along the Idaho-Montana border and in Montana. This phenomenon may explain the range of filament shapes found in M. occidentalis, from flattened to sightly club-shaped. The issue of the status of M. idahoensis with respect to M. marshallii (D. L. Krause and K. I. Beamish 1972) is best deferred until a thorough study of the whole complex over its entire range is done. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 8, p. 64. | FNA vol. 8, p. 62. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga idahoensis, Saxifraga marshallii subsp. idahoensis, Saxifraga marshallii var. idahoensis, Saxifraga occidentalis var. idahoensis | Saxifraga aequidentata, Saxifraga occidentalis subsp. rufidula, Saxifraga occidentalis var. rufidula, Saxifraga rufidula |
Name authority | (Piper) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , | Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905) |
Web links |
|
|