watercress (Rorippa nasturtium-aquaticum)
waterleaf (Hydrophyllum)
water pimpernel or brookweed (Samolus parviflorus)
waterwort (Elatine)
wax vine; wax vines: Cape ivy (Senecio macroglossus)
weeds [close up all “weed” words unless the first word is a proper name; see A–Z for other listings]:
beggarweed (Desmodium)
chickweed: common chickweed (Stellaria media)
duckweed, common (Lemna minor)
duckweed, giant (Spirodela oligorhiza)
duckweed [tiny leaves] (Wolffia arrhiza)
jewelweed (Impatiens)
Jimson weed (Datura stramonium)
pickerelweed (Pontederia cordata)
pigweed (Amaranthus)
ragweed (Ambrosia)
silverweed (Potentilla anserina)
waxweed, tropical or Columbian (Cuphea carthagenensis)
whippoorwill flower; whippoorwill flowers (Trillium cernuum)
Wichuraiana (see Rosa wichuraiana in A–Z)
woolly thyme (Thymus pseudolanuginosus)
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