Common name: Pale Knotweed
Persicaria lapathifolia (L.) Delarbre APNI*
Synonyms: Polygonum lapathifolium L. APNI*
Polygonum lanigerum R.Br. APNI*
Description: Plant erect to ascending, 50–180 cm high, usually glabrous; sometimes rooting at nodes, often reddish, often with scattered sessile glands.
Leaves ovate to narrow-elliptic, 6–21 cm long, 10–45 mm wide, with glands dense on lower surface and scattered on upper; veins and margins pubescent, occasionally tomentose; petiole 5–22 mm long; ocrea without cilia.
Spikes elongate-cylindrical, dense, 2.5–6 cm long, 4–7 mm diam., with flowers crowded and overlapping. Perianth segments 1.5–2.7 mm long.
Achene lenticular, 1.5–2.0 mm long, 1.2–1.7 mm diam., brown to dark brown.
Distribution and occurrence: Widespread in at least seasonally damp situations. Possibly introduced.
NSW subdivisions: NC, CC, SC, NT, CT, ST, NWS, CWS, SWS, NWP, SWP, NFWP, SFWP
Other Australian states: Qld Vic. Tas. S.A. N.T.
Text by K. L. Wilson
Taxon concept: Flora of NSW 1 (1990)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.