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Montana Field Guide

Montana Field Guides

Idaho Saxifrage - Micranthes idahoensis
Other Names:  Micranthes marshallii, Saxifraga marshallii, Saxifraga idahoensis, Saxifraga occidentalis var. idahoensis

Global Rank: G4
State Rank: S4

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

General Description
Perennial from a simple rootstock. Stems solitary, scapose, 10–25 cm, glandular-hairy. Leaves basal (rarely 1 cauline), petiolate; the blade broadly ovate, truncate or rounded to the petiole, 1–4 cm long, prominently dentate, glabrous above, sparsely brown hairy beneath. Inflorescence glandular, spreading-paniculate. Flowers: calyx cup-shaped with lobes 1–2 mm long; hypanthium <0.5 mm long; petals obovate, white, 2–3 mm long with 2 yellow spots at the base; ovary superior. Capsule 2–4 mm long, follicle-like (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Lesica (2012) treats this species as M. marshallii.

Species Range

Range Comments
WA to MT south to CA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Very shallow, usually moss-covered soil on rock outcrops in the montane to timberline zones.

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Citation for data on this website:
Idaho Saxifrage — Micranthes idahoensis.  Montana Field Guide.  .  Retrieved on , from