Polygonum parryi |
Polygonum aviculare |
|
---|---|---|
Parry's knotweed, prickly knotweed |
||
Habit | Highly variable species, prostrate and spreading (but not rooting at the nodes) to occasionally erect, freely-branched annual, the stems terete, striate, up to 1 m. long. | |
Leaves | Numerous, bluish-green, only slightly reduced upward, narrowly oblong, 1-3 cm. long and 2-6 mm. broad, narrowed to a very short, jointed petiole; stipules lacerate, 3-6 mm. long. |
|
Flowers | 1-3 in the axils of the leaves or leaf-like bracts, the pedicles 1-3 mm. long, erect; perianth 2.5 mm. long, divided 2/3 the length, the segments 5, oblong, sub-equal, greenish with white to pink or red margins. |
|
Fruits | Achene with 3 sharp angles, brownish, smooth. |
|
Polygonum parryi |
Polygonum aviculare |
|
Flowering time | June-July | May-October |
Habitat | Vernal pools, seasonally damp ground at low elevations. | Dry or slightly moist, disturbed soil, often where hard-packed. |
Distribution | Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
|
Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
|
Origin | Native | Both native and introduced |
Conservation status | Threatened in Washington (WANHP) | Not of concern |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
|
|