Browse Plants by Type: 3 or 6 petals

Platanthera stricta

Platanthera stricta

slender bog orchid
Polygonum amphibium

Polygonum amphibium

water smartweed
Polygonum aviculare

Polygonum aviculare

common knotweed
Polygonum bistortoides

Polygonum bistortoides

western bistort
Polygonum cuspidatum

Polygonum cuspidatum

Japanese knotweed
Polygonum davisiae

Polygonum davisiae

Davis' knotweed
Polygonum douglasii

Polygonum douglasii

Douglas's knotweed
Polygonum lapathifolium

Polygonum lapathifolium

willow smartweed
Polygonum minimum

Polygonum minimum

broadleaf knotweed
Polygonum paronychia

Polygonum paronychia

beach knotweed
Polygonum persicaria

Polygonum persicaria

lady's-thumb knotweed
Polygonum polygaloides

Polygonum polygaloides

white-margined knotweed
Polygonum shastense

Polygonum shastense

Shasta knotweed
Rumex acetosella

Rumex acetosella

sheep sorrel
Rumex crispus

Rumex crispus

curly dock
Rumex maritimus

Rumex maritimus

golden dock
Rumex salicifolius

Rumex salicifolius

willow-leaved dock