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Montana Field Guide

Montana Field Guides

Green Milkweed - Asclepias viridiflora

Native Species

Global Rank: G5
State Rank: S3S4

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Taprooted with a usually simple crown. Stems usually simple, 10–50 cm. Herbage puberulent to tomentose. Leaves spreading to erect, opposite to subopposite; blades lance-linear to ovate, 4–15 cm long. Umbels of 20 to 80 flowers; peduncles 2–15 mm long. Flowers 9–12 mm high; sepals 2–3 mm long, glabrate; petals green, puberulent, 4–7 mm long; gynostegium light green, glabrous, 2–3 mm high; hoods oblong, 4–5 mm long with a pair of shallow, marginal lobes at midlength and a dorsal, petal-like appendage; horns absent. Follicles erect, ovoid-fusiform, smooth, glabrate to puberulent, 7–10 cm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
A milkweed known from Connecticut and southern New York, west to Michigan and Manitoba, and south to Georgia, Arizona and northern Mexico. It is more common in the western portions of the range.

Observations in Montana Natural Heritage Program Database
Number of Observations: 17

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Green Milkweed — Asclepias viridiflora.  Montana Field Guide.  .  Retrieved on , from