''Oenothera hartwegii'' (syn. ''Calylophus hartwegii''), Hartweg's sundrops, is a species of flowering plant in the evening primrose family Onagraceae. It is native to the

desert southwest The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural list of regions of the United States, region of the United States that generally includes Arizona, New Mexico, and adjacen ...

of the United States, and to northern and western Mexico. A perennial usually tall and wide, it is used locally as a drought-resistant ground cover.

Subtaxa

The following subspecies are accepted: *''Oenothera hartwegii'' subsp. ''fendleri'' – Arizona, New Mexico, Kansas, Oklahoma, Texas, northeastern Mexico *''Oenothera hartwegii'' subsp. ''filifolia'' – New Mexico, Texas, northeastern Mexico *''Oenothera hartwegii'' subsp. ''hartwegii'' – Colorado, Texas, northern and western Mexico *''Oenothera hartwegii'' subsp. ''maccartii'' – Texas, northeastern Mexico *''Oenothera hartwegii'' subsp. ''pubescens'' – Arizona, New Mexico, Colorado, Kansas, Oklahoma, Texas, northeastern Mexico

References

hartwegii Flora of Arizona Flora of Colorado Flora of Kansas Flora of Oklahoma Flora of the South-Central United States Flora of Northwestern Mexico Flora of Northeastern Mexico Flora of Southwestern Mexico Plants described in 1839 {{Myrtales-stub