scale bar = 1cm.
Slender Knotweed- a native (Persicaria decipiens)
Family: Polygonaceae (Knotweed family).
Cosmopolitan, including Australia.
Occurrence: Grows beside streams, and the margins of
swamps and lakes.
- it grows in damp areas
- it is erect or spreading, growing up to about 80cm.
- the flowers are in erect clusters to 6cm long
- there are sheaths at the base of the leaves which surround the stem; the sheaths end in stiff hairs.
Pale Knotweed is a perennial.
Photos. Slender Knotweed. 1, 2: Forest Creek at Castlemaine. 3. Nathalia 3, 4: The sheath at the leaf base ends in erect hairs.
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 to 1 metre or more. Sheaths at base of leaves summit often torn, not ending in hairs.