Key to Tasmanian Dicots
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Persicaria lapathifolia (formerly known as Polygonum lapathifolium; Polygonaceae) 3:591

 
Persicaria lapathifolia (Pale Knotweed) is a widespread weed in seasonally or continuously wet places. It is an erect to ascending herb to 50-180 cm high. It is usually usually glabrous but is sometimes quite hairy. The leaves are ovate to narrow elliptic, 6-21cm long by 10-45mm wide, dense with glands on lower surface. The spikes are dense and elongate with flowers overlapping.
 

  

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