Browse Plants by Type: 3 or 6 petals

Platanthera stricta

slender bog orchid

Polygonum amphibium

water smartweed

Polygonum aviculare

common knotweed

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 polygaloides

white-margined knotweed

Polygonum shastense

Shasta knotweed

Rumex acetosella

sheep sorrel

Rumex crispus

curly dock

Rumex maritimus

golden dock

Rumex salicifolius

willow-leaved dock