Polygonum

Polygonum maritimum

Sea knotgrass

Polygonum rottboellioides var. rottboellioides

Polygonum roberti

Polygonum amgense

Polygonum ajanense subsp. middendorfii

Polygonum norvegicum

Polygonum ajanense subsp. ajanense

Polygonum ajanense

Polygonum bargusinense

Polygonum zaravschanicum

Polygonum nesomii

Polygonum basiramia

Polygonum paniculatum

Polygonum uvifera

Polygonum arenastrum

Oval-leaf knotweed

Polygonum aviculare var. arenastrum

Polygonum engelmannii

Polygonum bellardii

Narrowleaf knotweed

Polygonum bistorta var. bistorta

Polygonum bolanderi