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Montana Field Guide

Montana Field Guides

Hemlock Parsley - Conioselinum scopulorum

Undetermined Origin

Global Rank: G4
State Rank: SNA

Agency Status


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General Description
Hemlock Parsley is a perennial herb with simple stems which are 3-10 dm high and arise from a club-shaped taproot or cluster of fleshy roots and a simple or little-branched rootcrown. The alternate leaves are divided into 7-11 leaflets, the lower of which are divided 2-3 more times. The leaves are triangular in outline and 3-19 cm long with a 3-23 cm long petiole and a dilated sheath at the base. Ultimate leaf segments are less than 3 mm wide. The foliage is glabrous below the inflorescence. Small, white flowers occur in hemispherical clusters borne at the ends of 9-15 stalks, which are arranged in an umbrella-shaped inflorescence, or umbel; the umbel is 3-10 cm in diameter and is located at the top of the stems. Each cluster of flowers is subtended by 3-6 thread-like bracts, which comprise an involucre that is 2-8 mm long. The flattened, egg-shaped fruits are 4-6 mm long and have corky, thickened margins and a conspicuous thickening at the top at the base of the style, known as a stylopodium.

Fruiting in July.

Diagnostic Characteristics
Species in Apiaceae are often difficult to distinguish; a hand lens or microscope and identification manual are necessary. Hemlock Parsley can be distinguished from members of the closely-related genus Ligusticum by the involucre of 3 or more bracts and by the lack of stringy old leaf bases at the summit ofthe rootcrown.

Range Comments
South-central MT to AZ and NM. Peripheral.

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(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)

Riparian forests and moist meadows in the valleys.

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Citation for data on this website:
Hemlock Parsley — Conioselinum scopulorum.  Montana Field Guide.  .  Retrieved on , from