Modoc County Knotweed

Polygonum polygaloides ssp. esotericum

Kellogg's Knotweed

Polygonum polygaloides ssp. kelloggii

Bushy Knotweed

Polygonum ramosissimum

Bushy Knotweed

Polygonum ramosissimum ssp. ramosissimum

Polygonum sawatchense

Polygonum sawatchense ssp. oblivium

Polygonum sawatchense ssp. sawatchense

Shasta Knotweed

Polygonum shastense

Spurry Knotweed

Polygonum spergulariiforme