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Montana Field Guide

Montana Field Guides

Columbia Lewisia - Lewisia columbiana

Species of Concern

Global Rank: G4G5
State Rank: S1S2
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank: 3

External Links

State Rank Reason (see State Rank above)
Rare and peripheral in Montana, where it is known from only one location in the Bitterroot Mountains. Its relatively inaccessible habitat reduces the potential for negative impacts.
General Description
Columbia lewisia is a succulent, glabrous perennial with several leafless stems, 5-15 cm (2-6 in) high, from a fleshy, unbranched rootcrown. Strap-shaped basal leaves are up to 4 cm (1 in) long. Stems have small leaf-like bracts with entire or toothed margins. Flowers are borne on short stalks subtended by a small gland-toothed bract in a branched, open inflorescence. Each flower has 2 glandular-toothed sepals, 1-2 mm long; 7-9 pinkish petals, 5-8 mm long; and 5-6 stamens. The fruit is a globose capsule, ca. 3 mm high, with 1-5 shiny black seeds. Our plants are variety wallowensis C.L. Hitchc.

Flowering in June-July.

Diagnostic Characteristics
Lewisia columbiana is our only member of the Portulacaceae with gland-toothed bracts in the inflorescence.

Species Range

Range Comments
Endemic to central ID and adjacent OR and one canyon in Ravalli County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 8

(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)

Moist rock crevices in granite along streams in the foothill and montane zones.

Ecological Systems Associated with this Species

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Citation for data on this website:
Columbia Lewisia — Lewisia columbiana.  Montana Field Guide.  .  Retrieved on , from