Oenothera hispida (Bentham) W.L.Wagner, Hoch & Zarucchi A Habit, Mexico, Nuevo León, Roybal 34 (US) B Flower, lateral view, Roybal 34 (US) C Flower, face view, digital image (Ray Pistrum as “Gaura drummondii fresh flower” [http://redsgoodvsevilcowbarn.blogspot.com/2012/06/chigger-chow-and-gaura-drummondii.html]) D Base of staminal filaments showing basal scales, Roybal 34 (US) E Capsule, Texas, Hall 213 (US) F Oenothera suffrutescens (Ser.) W.L.Wagner & Hoch capsule, New Mexico, Standley 6481 (US).