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Montana Field Guide

Montana Field Guides

Robert Geranium - Geranium robertianum

Exotic Species (not native to Montana)

Global Rank: G5
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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General Description
Annual. Stems prostrate to ascending, 10–30 cm. Herbage villous, glandular in the inflorescence, scented. Leaf blades deltoid in outline, 4–10 cm wide, palmately divided into 3 or 5 deeply twice-lobed leaflets. Flowers: sepals 5–6 mm long; petals ca. 12 mm long, rose; fertile stamens 5. Capsule 2–3 cm long including the style column (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced to north-temperate N. America; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat
Moist, disturbed soil of riparian forests; valleys of Missoula County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Robert Geranium — Geranium robertianum.  Montana Field Guide.  .  Retrieved on , from