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Montana Field Guides

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

Native Species

Global Rank: G5
State Rank: S4

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

External Links






 
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
Montana Range

Year-round
 


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

Observations in Montana Natural Heritage Program Database
Number of Observations: 1104

(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
  • Additional ReferencesLegend:   View Online Publication
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    • Eversman, S.T. 1968. A comparison of plant communities and substrates of avalanche and non-avalanche areas in south central Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 39 pp.
    • Fultz, J.E. 2005. Effects of shelterwood management on flower-visiting insects and their floral resources. M.Sc. Thesis. Bozeman, MT: Montana State University. 163 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Joslin, G.J. 1975. Behavior and environmental selection by Elk (Cervus canadensis nelsoni) during surrmer and fall in the First and Second Yellow Mule drainages, Madison County, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University, Bozeman. 65 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Saunders, J.K., Jr. 1954. A two-year investigation of the food habits and range use of the Rocky Mountain goat in the Crazy Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 22 p.
    • Simanonok, M. 2018. Plant-pollinator network assembly after wildfire. Ph.D. Dissertation. Bozeman, MT: Montana State University. 123 p.
    • Stivers, T.S. 1988. Effects of livestock grazing on grizzly bear habitat along the east front of the Rocky Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 80 p.
    • Stoecker, R.E. 1967. A population study of five species of small rodents in the Bridger Mountains of Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 32 p.
    • Tuinstra, K. E. 1967. Vegetation of the floodplains and first terraces of Rock Creek near Red Lodge, Montana. Ph.D dissertation. Montana State University, Bozeman 110 pp.
    • Tyers, D.B. 2003. Winter ecology of moose on the Northern Yellowstone Winter Range. Ph.D. Dissertation. Bozeman, MT: Montana State University. 308 p.
    • Williams, K.L. 2012. Classification of the grasslands, shrublands, woodlands, forests and alpine vegetation associations of the Custer National Forest portion of the Beartooth Mountains in southcentral Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 376 p.
    • Zimmer, J.P. 2004. Winter habitat use and diet of Snowshoe Hares in the Gardiner, Montana area. M.Sc. Thesis. Bozeman, Montana: Montana State University. 65 p.
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Citation for data on this website:
Cow-parsnip — Heracleum lanatum.  Montana Field Guide.  .  Retrieved on , from