''Polygonum utahense'', the Utah knotweed, is an unresolved name for a putative North American species of plants in the

buckwheat family The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus ''Polygonum'', and was first used by Antoine Laurent de Jussieu in 1789 ...

. It has been found only in the States of

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...

and

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

in the southwestern United States.Biota of North America Program 2014 county distribution map
/ref> ''Polygonum utahense'' is a herb up to tall. Stems are green or brown, not wiry. Leaves are narrow, up to long. Flowers are pink or white.Flora of North America, ''Polygonum utahense'' Brenckle & Cottam, 1940. Utah knotweed
/ref>

References

{{Taxonbar, from=Q15601249 utahense Endemic flora of the United States Flora of Utah Flora of Arizona Plants described in 1940 Flora without expected TNC conservation status