scale bar = 1cm.

Slender Knotweed- a native (Persicaria decipiens)

Home..... Menu..... Common name index..... Scientific name index..... Glossary ..... Wetland plants....


Family: Polygonaceae (Knotweed family).

Cosmopolitan, including Australia.

Occurrence: Grows beside streams, and the margins of swamps and lakes.


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.