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Montana Field Guides

Slender-fruited Willowherb - Epilobium leptocarpum


Global Rank: G5
State Rank: SNR

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General Description
Delicate perennials, 8-30 cm tall; small basal or subsurface turions present; gemmae sometimes in upper leaf axils; stems glabrous (or strigillose above) but with lines of hairs decurrent from petioles. Petioles 3-5 mm below but leaves becoming sessile above. Leaf blades 0.8-4 cm long, narrowly lanceolate to elliptic, glabrous or sparsely hairy on margins; margins entire below but becoming denticulate above. Inflorescence nodding to nearly erect. Sepals 2.9-4 mm long, narrowly lanceolate, strigillose; petals 4-6.5 mm long, white fading to pink. Ovary densely strigillose; style to nearly 4 mm long; stigma broadly clavate. Capusle 2.5-5.5 cm long, 1-2 mm wide, sparsely strigillose. Seeds 0.8-1.2 mm long, papillose, coma 3.5-6.5 mm long, brownish, persistent (adapted from: Hoch, 1994, in Flora of Alberta, 2nd ed., revised).

Diagnostic Characteristics
Epilobium leptocarpum resembles Epilobium ciliatum but has a dull brownish coma (tuft of hairs on the seed) (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Kartesz (in prep. 2012) shows the species as having a highly irregular and spotty distribution in the US from WA and OR, CO, MT (Glacier and Meaghre counties), Fremont County (ID), and San Juan County (NM).

Habitat
Moist open stony slopes (Hoch, 1994, in Flora of Alberta, 2nd ed., revised).

References
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Citation for data on this website:
Slender-fruited Willowherb — Epilobium leptocarpum.  Montana Field Guide.  .  Retrieved on , from