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Montana Field Guide

Montana Field Guides

Cow-parsnip - Heracleum lanatum
Other Names:  Heracleum maximum, Heracleum sphondylium


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

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General Description
Robust perennial with a stout taproot. Stems erect, hollow, 1–2 m. Herbage pubescent on veins and stems. Leaves basal and cauline, divided into 3 cordate leaflets; each 10–30 cm long, serrate and 3- to 7-lobed; petioles dilated basally. Umbels compound, glandular-villous, 10–20 cm across; rays 2–10 cm long; involucral and involucel bracts linear, 3–10 mm long. Flowers white; sepals minute; petals ca. 2 mm long; outer petals of outer flowers in each umbellet larger, lobed; stylopodium conical. Mericarps glabrous, obcordate to obovate, 7–12 mm long, strongly compressed parallel to the commissure; marginal wings 0.5–1 mm long; dorsal ribs raised; oil tubes solitary in the intervals, visible as dark lines reaching halfway to the base (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
AK to NL south to CA, AZ, OH and GA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 60

(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
Moist soil of avalanche slopes, thickets, open forest, woodlands, often along streams; valleys to subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Cow-parsnip — Heracleum lanatum.  Montana Field Guide.  .  Retrieved on , from