Oenothera oakesiana (A.Gray) J.W.Robbins ex S.Watson & Coult.  
Family: Onagraceae
Oakes' evening-primrose
[Oenothera angustissima R.R.Gates, Oenothera biennis var. oakesiana L., Oenothera cruciata var. stenopetala Nutt. ex G.Don, Oenothera parviflora subsp. angustissima L., Oenothera parviflora var. angustissima L., Oenothera parviflora var. oakesiana L., Oenothera stenopetala E.P.Bicknell]
Oenothera oakesiana image
John E. Maunder  
Etymology: Oenothera: from Greek oinos, "wine," and thera, "to imbibe," because an allied European plant was thought to induce a taste for wine
Plants: erect, biennial, 2'-6' tall forb, mostly hairless or only finely fuzzy
Leaves: lance-like to oblong, alternate
Flowers: yellow, 4-parted, 3/4"-1 1/2" wide; inflorescence a terminal, usually unbranched spike nodding at the tip
Fruits: capsule slightly tapering towards top; seeds without tufts of hair at the top
Habitat: disturbed sites
Conservation Status: Native
Oenothera oakesiana image
from USDA Plants website  
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