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Montana Field Guide

Montana Field Guides

Black Locust - Robinia pseudoacacia

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
Trees to 20 m with furrowed bark. Herbage glabrate to puberulent. Stems sometimes with nodal spines. Leaves petiolate, odd-pinnate with 9 to 17 ovate to narrowly elliptic leaflets 2–6 cm long with pubescent petiolules; stipules linear, early-deciduous. Inflorescence axillary, pendent, densely-flowered raceme 5–20 cm long. Flowers papilionaceous, white; calyx pubescent; sepals deltoid,1–3 mm long, lower 2 larger; banner 14–19 mm long with a yellow center, ca. as long as the wings and keel; stamens 9 united, 1 separate. Fruit a linear, glabrous legume flattened parallel to the sutures, 4–10 cm long, slightly indented between the seeds (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Collected in Lake and Missoula counties. Introduced from eastern N. America to much of the U.S. and Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat

References
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Citation for data on this website:
Black Locust — Robinia pseudoacacia.  Montana Field Guide.  .  Retrieved on , from