Browse Plants by Type: 3 or 6 petals
Platanthera stricta
slender bog orchid
Platystemon californicus
cream cups
Polygonum amphibium
water smartweed
Polygonum aviculare
common knotweed
Polygonum bistortoides
western bistort
Polygonum cuspidatum
Japanese knotweed
Polygonum davisiae
Davis' knotweed
Polygonum douglasii
Douglas's knotweed
Polygonum lapathifolium
willow smartweed
Polygonum minimum
broadleaf knotweed
Polygonum paronychia
beach knotweed
Polygonum persicaria
lady's-thumb knotweed
Polygonum phytolaccifolium
alpine knotweed
Polygonum polygaloides
white-margined knotweed
Polygonum shastense
Shasta knotweed
Rumex acetosella
sheep sorrel
Rumex crispus
curly dock
Rumex maritimus
golden dock
Rumex occidentalis
western dock
Rumex salicifolius
willow-leaved dock