Epilobium pygmaeum (Speg.) Hoch & Raven  

Family: Onagraceae

smooth spike-primrose, more...smooth willowweed

[Boisduvalia glabella (Nutt.) Walp., moreBoisduvalia glabella var. campestris (Jepson) Jepson, Boisduvalia pygmaea (Speg.) Munz, Oenothera glabella Nutt.]