Hemlock Parsley - Conioselinum scopulorum
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.
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.
South-central MT to AZ and NM. Peripheral.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Riparian forests and moist meadows in the valleys.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.