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Montana Field Guide

Montana Field Guides

Hemlock Water-parsnip - Sium suave


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 7

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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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 234

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

References
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Citation for data on this website:
Hemlock Water-parsnip — Sium suave.  Montana Field Guide.  .  Retrieved on , from