Polygonum achoreum S.F. Blake
Blake's knotweed (leathery knotweed)
Polygonaceae (Buckwheat family)
Introduction to Vascular Plants
Blake's knotweed (leathery knotweed)
Polygonaceae (Buckwheat family)
Introduction to Vascular Plants
Species Information
General:
Annual herb from a taproot; stems prostrate to ascending, several, branched, ridged, bluish-green, 10-70 cm tall/long.
Leaves:
Basal leaves lacking; stem leaves alternate, oval to egg-shaped, rounded at the tips, crowded and overlapping, blue-green to bright green, the blades 1-3 cm long, reduced upwards, the stalks short, jointed; stipules jagged, 5-11 mm long.
Flowers:
Inflorescence of 1-3 flowers in axils of leaves or bracts; perianths 2.5-3.5 mm long, pear-shaped, 5-lobed less than 1/2 the distance to the base, greenish with narrow white or sometimes pinkish borders.
Fruits:
Achenes, more or less 3-sided, yellowish-green to tan, dull, slightly but uniformly pimply, 3 mm long.
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 Polygonum achoreum
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) |
1372 | 964 | 1780 |
| Slope
Gradient (%) |
4 | 2 | 7 |
|
Aspect (degrees) |
281 | 282 | 282 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
5 | 4 | 6 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
2 | ||
| Modal
BEC Zone Class |
BWBS | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
BWBS(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Dry roadsides and disturbed sites in the lowland and steppe zones; infrequent in BC east of the Coast-Cascades Mountains N to 53degreeN; N to AK, E to NF and S to NY and CO.Status Information
Synonyms
Synonyms and Alternate Names:
Polygonum erectum L.
Polygonum erectum subsp. achoreum (S.F. Blake) A. L÷ve & D. L÷ve