$modus 0:
$modus 1:
Polygonum douglasii
Polygonum douglasii Greene [Accepted]
Polygonaceae
2 822412 Polygonum douglasii Greene
Ann. Missouri Bot. Gard., vol. 91 : p. 326, fig. 1B (2004) [unsigned]
822412
Polygonum douglasii Greene
Canad. Field-Naturalist, vol. 124 : p. 13, fig. 3 (2010)