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Montana Field Guide

Montana Field Guides

Poison-hemlock - Conium maculatum

Exotic Species (not native to Montana)

Global Rank: G5
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

External Links






 
General Description
Glabrous, highly poisonous biennials. Stems stout, hollow, erect, branched, 0.5–3 m, purple-spotted. Leaves basal and cauline, petiolate; blades ovate in outline, 15–30 cm long, tripinnate; leaflets lobed; ultimate segments <1 mm long. Umbels terminal and axillary, compound; involucral and involucel bracts, lanceolate to ovate. Flowers white; stylopodium low-conic; styles reflexed. Mericarps ovoid, slightly compressed parallel to the commissure, glabrous, 2–3 mm long; ribs barely winged; oil tubes many in the intervals (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Introduced throughout most of temperate N. America; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 2

(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, disturbed soil along streams, ditches, cool open slopes; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View Online Publication
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    • Hendrick, U. P., ed. 1972. Sturtevant's edible plants of the world. Dover Pub., New York. 188 pp.
    • James, W. R. 1973. Know your poisonous plants. Naturegraph Publishers, Healdsburg, Ca. 99pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Munz, P.A., and D.D. Keck. 1973. A California flora and supplement. Univ. California Press, Berkeley, CA.
    • Robbins, W. W., M. K. Bellue, and W. S. Ball. 1970. Weeds of California. State of California, Department of Agriculture.
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Citation for data on this website:
Poison-hemlock — Conium maculatum.  Montana Field Guide.  .  Retrieved on , from