Micranthes ferruginea

(Graham) Brouillet & Gornall

J. Bot. Res. Inst. Texas 1: 1020. 2007 ,.

Common names: Rusty saxifrage
Basionym: Saxifraga ferruginea Graham Edinburgh New Philos. J. 7: 349. 1829
Synonyms: Saxifraga ferruginea var. macounii Engler & Irmscher Saxifraga ferruginea var. newcombei (Small) Hultén Saxifraga ferruginea var. vreelandii (Small) Engler & Irmscher Saxifraga newcombei
Treatment appears in FNA Volume 8. Treatment on page 58. Mentioned on page 49, 50, 53.

Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. Leaves basal; petiole indistinct, flattened, to 2 cm; blade spatulate to oblanceolate, 1–8(–10) cm, ± fleshy, base cuneate, margins irregularly serrate (usually with fewer than 12 coarse teeth), ciliate, surfaces hairy. Inflorescences 20–30+-flowered, (flowers sometimes replaced ± completely by bulbils, or bulbils sometimes absent), open, lax thyrses, 10–40 cm, moderately to ± densely purple stipitate-glandular; (bracts reduced). Flowers ± bilaterally symmetric; sepals reflexed, ovate to oblong; petals white, 3 with 2 basal yellow spots, 2 without spots, elliptic to oblanceolate, clawed, 3–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior, (to 1/3 adnate to hypanthium). Capsules green or yellow, sometimes purple tinged, or partly purple, valvate. 2n = 20.

Phenology: Flowering summer–early autumn.
Habitat: Wet ledges, seepage slopes, stream banks
Elevation: 10-2700 m


V8 101-distribution-map.gif

Alta., B.C., N.W.T., Alaska, Calif., Idaho, Mont., Oreg., Wash., Wyo.


Plants with bulbils replacing flowers are more common in the southern part (southern Alberta and British Columbia southwards) of the range of Micranthes ferruginea and have been called Saxifraga ferruginea var. macounii.

Selected References


Lower Taxa

... more about "Micranthes ferruginea"
Luc Brouillet +  and Patrick E. Elvander† +
(Graham) Brouillet & Gornall +
Saxifraga ferruginea +
Rusty saxifrage +
Alta. +, B.C. +, N.W.T. +, Alaska +, Calif. +, Idaho +, Mont. +, Oreg. +, Wash. +  and Wyo. +
10-2700 m +
Wet ledges, seepage slopes, stream banks +
Flowering summer–early autumn. +
J. Bot. Res. Inst. Texas +
Saxifraga ferruginea var. macounii +, Saxifraga ferruginea var. newcombei +, Saxifraga ferruginea var. vreelandii +  and Saxifraga newcombei +
Micranthes ferruginea +
Micranthes +
species +