Sium suave Walter
hemlock water-parsnip (hemlock waterparsnip)
Apiaceae
Introduction to Vascular Plants
hemlock water-parsnip (hemlock waterparsnip)
Apiaceae
Introduction to Vascular Plants
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Species Information
General:
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.
Leaves:
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.
Flowers:
Inflorescence of compound umbels; flowers white, small; calyx teeth minute or obsolete; involucel bractlets 6-10, narrow, reflexed.
Fruits:
Oval to elliptic, 2-3 mm long, prominently ribbed.
Illustration
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
Ecology
Ecological Framework for Sium suave
The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)
The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)
| Site Information |
Value / Class |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
753 | 0 | 1310 |
| Slope
Gradient (%) |
0 | 0 | 18 |
|
Aspect (degrees) |
226 | 58 | 290 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
7 | 5 | 8 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
139 | ||
| Modal
BEC Zone Class |
IDF | ||
|
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
|
|||
Habitat and Range
Wet streamsides, swamps, marshes, lake and pond shores in the lowland and montane zones; common throughout BC except Queen Charlotte Islands and adjacent coast; N to AK, YT and NT, E to NF and S to FL, VA, KS and CA.Status Information
Synonyms
Synonyms and Alternate Names:
Sium cicutifolium Schrank
Sium floridanum Small
Sium suave var. floridanum (Small) C.F. Reed