scale bar = 1cm.
Creeping Knotweed - a native (Persicaria prostrata)
Family: Polygonaceae (Knotweed family).
Native of Australia and New Zealand.
Occurrence: Grows beside streams, and the margins of
swamps and lakes.
- it grows in damp areas
- it a prostrate plant
- the flowers are in dense clusters to 4cm long
- there are sheaths at the base of the leaves which surround the stem; the sheaths elongate into a leafy extension.
Pale Knotweed is a perennial.
Photos 1, 2: Creeping Knotweed. Bells Swamp. 3. The sheath at the leaf base has a green extension (now dried off on this pressed specimen)
There are three knotweeds common in the district. All grow in wet areas e.g.mud-flats, beside streams etc..
Creeping Knotweed Persicaria prostrata
. Prostrate plant. Sheaths at leaf bases develop a green leaf at the tip.
Slender Knotweed Persicaria decipiens
. Spreading or erect. Sheaths at leaf bases end in stiff hairs.
Pale Knotweed Persicaria lapathifolia
. Erect plant tp 1 metre or more. Sheaths at base of leaves summit often torn, not ending in hairs.