Flora of North America species comparison

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Micranthes rufidula
Micranthes rufidula

rusty-hair saxifrage
Habit Plants solitary or in groups, with bulbils on caudices, or rhizomatous.
Leaves

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, flat-topped thyrses, 5–20 cm, purple-tipped stipitate-glandular; (bracts often tangled brown-hairy).
Flowers

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

greenish to reddish purple, folliclelike.
2n

= 20, 38, 56, 58.

Micranthes rufidula
Phenology Flowering late winter–summer.
Habitat Wet to dry, rocky ledges
Elevation 0-3000 m [0-9800 ft]
Distribution
map from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Parent taxa Saxifragaceae > Micranthes
Sibling taxa
M. apetala, M. aprica, M. bryophora, M. californica, M. calycina, M. careyana, M. caroliniana, M. eriophora, M. ferruginea, M. foliolosa, M. fragosa, M. gaspensis, M. gormanii, M. hieraciifolia, M. hitchcockiana, M. howellii, M. idahoensis, M. integrifolia, M. lyallii, M. marshallii, M. micranthidifolia, M. nelsoniana, M. nidifica, M. nivalis, M. nudicaulis, M. occidentalis, M. odontoloma, M. oregana, M. palmeri, M. pensylvanica, M. petiolaris, M. razshivinii, M. reflexa, M. rhomboidea, M. spicata, M. stellaris, M. subapetala, M. tempestiva, M. tenuis, M. texana, M. tischii, M. tolmiei, M. unalaschcensis, M. virginiensis
Synonyms Saxifraga aequidentata, Saxifraga occidentalis subsp. rufidula, Saxifraga occidentalis var. rufidula, Saxifraga rufidula
Name authority Small: in N. L. Britton et al., N. Amer. Fl. 22: 140. (1905)
Source FNA vol. 8, p. 62. Treatment authors: Luc Brouillet, Patrick E. Elvander†.
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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