Terrestrial to semi-aquatic perennial herb from a very short, erect stem-base (not chambered) with fibrous roots that sometimes are tuberous-thickened; stems solitary, 0.5-1.2 m tall, stout, hollow, strongly ridged, generally branched above.
Stem leaves pinnately compound; leaf stalks with sheathing bases, blades 2-9 cm long, 1.5-10 (20) mm wide, divided into 7-15 leaflets that are lance-shaped to linear and toothed; submerged leaves much more finely divided; primary lateral veins of the leaflets not directed towards the base of the teeth.
Inflorescence of compound umbels; flowers white, small; calyx teeth minute or obsolete; involucel bractlets 6-10, narrow, reflexed.
Oval to elliptic, 2-3 mm long, prominently ribbed.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|BG(7), BWBS(7), CWH(9), ICH(15), IDF(59), MS(1), PP(1), SBPS(9), SBS(29)|
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Sium cicutifolium Schrank
Sium floridanum Small
Sium suave var. floridanum (Small) C.F. Reed