[The Buckwheat Family East of the Cascade Mts. of Oregon and Washington]

Knotweeds: The Genus Polygonum Found East of the Cascade Mountains of Oregon and Washington

Closeflowered Knotweed, Close-flowered Knotweed, Fruitleaf Knotweed: Polygonum polygaloides ssp. confertiflorum (Synonyms: Polygonum confertiflorum, Polygonum imbricatum, Polygonum kelloggii var. confertiflorum, Polygonum watsonii)

Closeflowered knotweed: Polygonum polygaloides ssp. confertiflorum

Smooth Alpine Knotweed: Aconogonon phytolaccifolium var. glabrum (Synonym: Polygonum phytolaccifolium)

Alpine Knotweed, Jimson Knotweed, Pokeweed Fleeceflower: Aconogonon phytolaccifolium var. phytolaccifolium (Synonym: Polygonum phytolaccifolium)

American Bistort, Snakeweed, Mountain Meadow Knotweed, Western Bistort: Bistorta bistortoides (Synonyms: Persicaria bistortoides, Polygonum bistortoides, Polygonum bistortoides var. linearifolium, Polygonum bistortoides var. oblongifolium, Polygonum cephalophorum, Polygonum glastifolium, Polygonum vulcanicum)

Garden Buckwheat: Fagopyrum esculentum (Synonyms: Fagopyrum sagittatum, Fagopyrum vulgare, Polygonum fagopyrum)

Bohemian Knotweed: Fallopia x bohemica (Synonym: Polygonum x bohemicum)

Climbing Bindweed, Black Bindweed: Fallopia convolvulus (Synonyms: Polygonum convolvulus, Polygonum convolvulus var. convolvulus) - Stems vine-like and twining. Leaves heart-shaped.

Japanese Knotweed: Fallopia japonica (Synonym: Polygonum cuspidatum)

Giant Knotweed: Fallopia sachalinensis (Synonym: Polygonum sachalinense)

Water Smartweed, Pink Smartweed: Persicaria amphibia (Synonyms: Polygonum amphibium, Polygonum amphibium var. coccineum, Polygonum amphibium var. emersum, Polygonum amphibium var. natans, Polygonum amphibium var. stipulaceum, Polygonum coccineum, Polygonum coccineum var. coccineum, Polygonum coccineum var. hartwrightii, Polygonum natans, Polygonum natans var. hartwrightii)

Smartweed, Marshpepper Smartweed: Persicaria hydropiper (Synonyms: Polygonum hydropiper, Polygonum hydropiper var. projectum)

Waterpepper: Persicaria hydropiperoides (Synonyms: Polygonum hydropiperoides, Polygonum hydropiperoides var. asperifolium, Polygonum hydropiperoides var. hydropiperoides, Polygonum hydropiperoides var. psilostachyum, Polygonum persicarioides)

Curltop Ladysthumb, Pale Smartweed, Willowweed, Willow-weed: Persicaria lapathifolia (Synonym: Polygonum lapathifolium, Polygonum lapathifolium var. lapathifolium, Polygonum lapathifolium var. incanum, Polygonum lapathifolium var. nodosum, Polygonum lapathifolium var. salicifolium)

Spotted Ladysthumb, Spotted Lady's-thumb, Heartweed, Redshank: Persicaria maculosa (Synonym: Polygonum persicaria)

Dotted Smartweed, Water Smartweed: Persicaria punctata (Synonyms: Polygonum acre, Polygonum acre var. leptostachyum, Polygonum punctatum, Polygonum punctatum var. confertiflorum, Polygonum punctatum var. ellipticum, Polygonum punctatum var. punctatum, Polygonum punctatum var. leptostachyum)

Blake's Knotweed, Leathery Knotweed: Polygonum achoreum (Synonym: Polygonum erectum ssp. achoreum)

Austin's Knotweed: Polygonum austiniae (Synonym: Polygonum douglasii ssp. austiniae, Polygonum douglasii var. austiniae)

Doorweed, Prostrate Knotweed: Polygonum aviculare (P. arenastrum)

California Knotweed: Polygonum californicum

Cascade Knotweed: Polygonum cascadense

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Erect Knotweed: Polygonum erectum

Gabriela's Knotweed: Polygonum gabrielae

Dwarf Desert Knotweed: Polygonum heterosepalum

Wiry Knotweed: Polygonum majus

Broadleaf Knotweed, Broad-leaved Knotweed, Leafy Dwarf Knotweed, Zigzag Knotweed: Polygonum minimum (Synonym: Polygonum torreyi)

Nuttall's Knotweed: Polygonum nuttallii - From the eastern foothills of the Oregon Cascades and west as well as in the Okanogan.

Parry's Knotweed: Polygonum parryi

Closeflowered Knotweed, Close-flowered Knotweed, Fruitleaf Knotweed: Polygonum polygaloides ssp. confertiflorum (Synonyms: Polygonum confertiflorum, Polygonum imbricatum, Polygonum kelloggii var. confertiflorum, Polygonum watsonii)

Kellogg's Knotweed: Polygonum polygaloides ssp. kelloggii (Synonyms: Polygonum kelloggii, Polygonum minutissimum, Polygonum unifolium)

Pokeweed Fleeceflower, White-margined Knotweed: Polygonum polygaloides ssp. polygaloides (Synonyms: Polygonum confertiflorum, Polygonum kelloggii, Polygonum kelloggii var. confertiflorum, Polygonum watsonii)

Bushy Knotweed, Yellow-flowered Knotweed: Polygonum ramosissimum ssp. ramosissimum

Sawatch Knotweed: Polygonum sawatchense (Synonyms: Polygonum douglasii ssp. johnstonii, Polygonum sawatchense ssp. oblivium, Polygonum douglasii var. johnstonii)

Fall Knotweed, Spurry Knotweed: Polygonum spergulariiforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum emaciatum, Polygonum spergulariaeforme)

Alpine Bistort: Polygonum viviparum

Paul Slichter E-mail