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Montana Field Guide

Montana Field Guides

Skeletonleaf Ragweed - Ambrosia tomentosa

Status Under Review

Global Rank: G4
State Rank: SU

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

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General Description
Rhizomatous perennial. Stems ascending to erect, simple or branched, 10–40 cm, puberulent. Leaves alternate; blades oblanceolate, 3–15 cm long, white-tomentose beneath, thinly strigose above, ca. twice pinnately divided and lobed; ultimate segments deltoid. Female heads 2-flowered. Male heads saucer-shaped with black veins, 3–6 mm wide with 25 to 40 florets, spreading on peduncles ca. 1 mm long. Bur 4–6 mm long, 2-beaked with erect spines (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
MT to MI south to AZ, NM 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:
Skeletonleaf Ragweed — Ambrosia tomentosa.  Montana Field Guide.  .  Retrieved on , from