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Montana Field Guide

Montana Field Guides

Western Trillium - Trillium ovatum


Global Rank: G5
State Rank: S4S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 6

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General Description
Short-rhizomatous, fibrous-rooted, glabrous perennials. Stems erect, 10–40 cm, naked below. Leaves (bracts) 3, sessile, whorled at the stem tip, 3–13 cm long, broadly ovate, acuminate. Inflorescence a solitary, terminal flower; pedicel 15–60 mm long. Flower regular, star-shaped; sepals green, narrowly lanceolate, 15–35 mm long; petals white or pinkish, fading to pink or reddish, separate, 25–40 mm; stamens shorter than petals; anthers yellow; style 3-lobed. Fruit a broadly ovoid, 3-winged, many-seeded capsule, 12–25 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; Hichcock and Cronquist 1973)

Species Range
Present
 


Range Comments
AB south to CA, ID and CO (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 66

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

Recency

 

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



Habitat

References
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Citation for data on this website:
Western Trillium — Trillium ovatum.  Montana Field Guide.  .  Retrieved on , from