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Montana Field Guide

Montana Field Guides

Big-pod Mariposa Lily - Calochortus eurycarpus

Native Species

Global Rank: G4
State Rank: S3S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Numerous recent reports from 7 counties. Tends to grow at high elevations, where its habitat is probably secure.
General Description
Stem 15–60 cm. Leaf blade linear to linear-lanceolate, 2–10 mm wide. Bracts 1–4 cm long. Flowers 1 to 3; sepals yellowish, 15–30 mm long; petals white or purplish, 3–4 cm long; inner surface sparsely hairy with a purple, flattened-hemispheric mark 4–6 mm above the fringed bullet-shaped gland; anthers oblong. Capsule ellipsoid, erect, 2–3 cm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Easily distinguished from C. bruneaunis and C. nuttallii by the arched, but not circular gland on the petals. Also, it has broader ovaries and fruits (orbicular to oblong) than either of these two species or its other local look-alike, C. gunnisonii (ovaries and fruits linear).

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

Observations in Montana Natural Heritage Program Database
Number of Observations: 16

(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)

Most often in subalpine meadows. In Montana, this species decends to the valleys. In either case, it prefers open areas and in Montana, it grows in well-drained soil.

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Citation for data on this website:
Big-pod Mariposa Lily — Calochortus eurycarpus.  Montana Field Guide.  .  Retrieved on , from