Geum rivale L.
water avens (purple avens)
Rosaceae (Rose family)
Introduction to Vascular Plants
water avens (purple avens)
Rosaceae (Rose family)
Introduction to Vascular Plants
Species Information click to expand contents
General:
Perennial herb from short rhizome and stout stem-base; stems erect, 30-80 cm tall, simple or few-branched, coarse-hairy becoming fine-hairy above.
Leaves:
Basal leaves several, long-stalked, interruptedly pinnately cleft, 10-30 cm long, hairy at least beneath, with 7 to 15 cleft and toothed segments, 1 to 3 of them much larger than the others, the terminal segment the largest, to 10 cm long, broadly egg-shaped and 3-lobed; additional much smaller segments remote and variable in shape; stem leaves alternate, 2 to 5, much smaller, variously toothed to 3-lobed.
Flowers:
Inflorescence an open, bracted, terminal cluster of 1 to 9 stalked flowers, the flowers nodding at first, later erect; corollas orange-pink to yellow and purple-veined, bell-shaped, the petals 5, erect, spoon-shaped, shallowly notched, 7-9 mm long; calyces reddish-purple, 5-lobed, the lobes erect, lanceolate, about 10 mm long, alternating with linear bractlets about 1/3 the length of the calyx lobes; ovaries superior; stamens very numerous, 100 or more.
Fruits:
Achenes, numerous, spreading, in hemispheric heads; achenes ellipsoid, flattened, 3-4 mm long, stiff-hairy, beaked with the 9- to 12-mm long style, which has an S-shaped kink a little above the middle, the lower persistent joint hairy below and smooth above, the upper (above the kink) ultimately deciduous joint long-hairy.
Illustration click to expand contents

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
USDA Species Characteristics click to expand contents
Flower Colour:
Purple
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source: The USDA
Ecology click to expand contents
Ecological Framework for Geum rivale
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) |
1007 | 8 | 1943 |
Slope
Gradient (%) |
2 | 0 | 30 |
Aspect (degrees) |
109 | 0 | 355 |
Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
6 | 1 | 8 |
Modal
Nutrient Regime
Class |
D | ||
#
of field plots species was recorded in: |
122 | ||
Modal
BEC Zone Class |
SBS | ||
All BEC Zones (# of stations/zone) species was recorded in |
BWBS(6), ESSF(21), ICH(18), IDF(10), MS(7), PP(2), SBPS(5), SBS(45) | ||
Source:
Klinkenberg 2013
|
Habitat and Range click to expand contents
Marshes, streambanks, swamps, and moist to wet meadows and open forests in the lowland and montane zones; infrequent in BC east of the Coast-Cascade Mountains, S of 57degreeN; circumboreal, E to NF and S to CA, NM, MO and PA; Eurasia.