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Montana Field Guide

Montana Field Guides

Thesium - Thesium arvense

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

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

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General Description
Herbaceous perennial with a branched crown from a deep-seated root. Stems ascending to erect, 10–30 cm, highly branched. Leaves sessile, linear, 1–5 cm long. Inflorescence an open-branched panicle with minutely glandular-serrate, leaf-like bracts. Flowers perfect, yellow-green; hypanthium 1–2 mm long; sepals 0.5–1 mm long. Fruit an ellipsoid nut, 2–3 mm long, ribbed longitudinally (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced to western MT; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat

References
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Citation for data on this website:
Thesium — Thesium arvense.  Montana Field Guide.  .  Retrieved on , from