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Montana Field Guide

Montana Field Guides

Buffalo Bur - Solanum rostratum

Native Species

Global Rank: G5?
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

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General Description
Annual. Stems ascending to erect, branched, 10–40 cm. Herbage with stellate hairs, beset with spines on the stem and veins. Leaf blades oblong, 2–8 cm long, deeply pinnately lobed, lobes rounded, sinuate to lobed. Inflorescence several-flowered racemes, pedicels erect in fruit; peduncle 1–4 cm long, borne between the leaves. Flowers: calyx lobes 3–6 mm long, densely spiny; corolla yellow; lobes spreading, 5–10 mm long; anthers 7–9 mm long, 1 anther longer and purple. Berry 7–10 mm long, completely enclosed in the swollen calyx (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Sporadic throughout much of U.S. and Mexico; native to the Great Plains states, perhaps introduced west of the Divide (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 16

(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
Grasslands, streambanks, pastures, roadsides; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Buffalo Bur — Solanum rostratum.  Montana Field Guide.  .  Retrieved on , from