Prenanthes sagittata (A. Gray) A. Nelson
arrow-leaved rattlesnake-root (arrowleaf rattlesnakeroot)
Asteraceae (Aster family)
Introduction to Vascular Plants
arrow-leaved rattlesnake-root (arrowleaf rattlesnakeroot)
Asteraceae (Aster family)
Introduction to Vascular Plants
.jpg){kind=link}
Species Information
General:
Perennial herb from a slightly thickened taproot; stems erect, solitary, branched above, long-hairy, exuding milky juice when broken, 30-70 cm tall.
Leaves:
Basal leaves arrowhead-shaped, long-stalked, blades irregularly toothed, glabrous, 3.5-12 cm long, 0.5-11 cm wide; stem leaves similar below, middle and lower ones with winged stalks, becoming short-stalked or unstalked, reduced upwards.
Flowers:
Heads with strap-shaped flowers, numerous in a spikelike inflorescence; involucres 7-13 mm tall; involucral bracts lance-oblong, the principal ones linear, about 8, sparsely long-hairy; ray flowers white.
Fruits:
Achenes finely lined between the nerves, cylindric or tapering to the summit, glabrous, 4-6 mm long; pappus of brownish hairlike bristles.
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 Prenanthes sagittata
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) |
646 | 420 | 850 |
| Slope
Gradient (%) |
7 | 0 | 15 |
|
Aspect (degrees) |
241 | 242 | 242 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
5 | 5 | 5 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
3 | ||
| Modal
BEC Zone Class |
SBS | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
CWH(1), SBS(2) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Moist to mesic roadsides, forests and streambanks in the montane zone; rare in SE BC, known only from Kishinena Valley and Akamina Creek; E to AB and S to N ID and MT.Status Information
Synonyms
Synonyms and Alternate Names:
Prenanthes alata var. sagittata Gray