Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Hemlock Water-parsnip - Sium suave

Native Species

Global Rank: G5
State Rank: S4
C-value: 7

Agency Status


External Links

General Description
Glabrous, fibrous-rooted perennial. Stems ascending to erect, 40–100 cm. Leaves pinnate; leaflets lance-linear, serrate, 2–9 cm long; submersed leaves narrower or bi- to tripinnate. Umbels: peduncles 5–15 cm long; rays 1–5 cm long; involucral bracts lanceolate, reflexed, 4–12 mm long; involucel bracts linear, 1–6 mm long, scarious-margined. Flowers white; sepals minute; stylopodium low-conical. Mericarps ellipsoid, glabrous, little compressed, 2–4 mm long; ribs raised, corky, not winged; oil tubes 1 to 3 per interval (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
BC to NL south to CA, TX and SC (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 312

(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)

Shallow, fresh water and banks of ponds, swamps, marshes, slow streams; plains, valleys, montane (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Semmens, W.J. 1996. Seasonal movements and habitat use of the Highlands/Pioneer Mountains bighorn sheep herd of southwest Montana. M. Sc. Thesis. Bozeman, MT: Montana State University. 103 p.
  • Web Search Engines for Articles on "Hemlock Water-parsnip"
Login Logout
Citation for data on this website:
Hemlock Water-parsnip — Sium suave.  Montana Field Guide.  .  Retrieved on , from