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Montana Field Guide

Montana Field Guides

Flat-spine Ragweed - Ambrosia acanthicarpa


Global Rank: G5
State Rank: S3S4

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

External Links






 
General Description
Taprooted annual. Stems erect, simple or branched, 10–50 cm. Herbage hispid, strigose. Leaves mostly alternate; blade broadly ovate, 2–8 cm long, twice pinnatifid into ovate ultimate segments. Female heads 1-flowered. Male heads cup-shaped, black-veined, 3–5 mm wide with 6 to 12 florets, spreading on peduncles 1–2 mm long. Bur 3–5 mm long, oblong, villous with stout spines (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
WA and AB to MN south to CA, AZ and TX (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat

References
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Citation for data on this website:
Flat-spine Ragweed — Ambrosia acanthicarpa.  Montana Field Guide.  .  Retrieved on , from