Common name: slender knotweed
Persicaria decipiens (R.Br.) K.L.Wilson APNI* Synonyms: Polygonum decipiens R.Br. APNI*
Polygonum minus auct. APNI*
Polygonum salicifolium Brouss. ex Willd. APNI*
Polygonum serrulatum Lagasca APNI*
Polygonum salicifolium Brouss. ex Willd. APNI*
Description: Plant decumbent to ascending, to 30 cm high.
Leaves narrow-elliptic to lanceolate, 5–12 cm long, 5–13 mm wide, often with a purplish blotch near middle of upper surface, occasionally with scattered sessile glands on lower surface, veins and margins pubescent; petiole 0–7 mm long; ocrea with cilia 2–10 mm long.
Spikes elongate-cylindrical, slender, rather lax, 2–6 cm long, 3–4 mm diam.; perianth segments 1.7–2.5 mm long.
Achene lenticular or trigonous, 1.5–2.0 mm long, c. 1.5 mm diam., dark brown to black.
Distribution and occurrence: Widespread in eastern NSW; also in Qld, Vic, Tas, SA, NT and WA; also Norfolk Island, New Zealand, New Caledonia, Malesia, SW Asia, Mediterranean region, Africa. In damp situations such as creek and lagoon banks.
NSW subdivisions: NC, CC, SC, NT, CT, ST, NWS, CWS, NWP, SWP
Other Australian states: Qld Vic. Tas. W.A. S.A. N.T.
Variable species that needs further study.
Text by K. L. Wilson (1990); edited KL Wilson (Jan 2014)
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.
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