Oenothera kunthiana (Spach) Munz
Family - Onagraceae
Stems - To 50cm tall but reclining or prostrate in habit, with appressed hairiness in upper portions, glabrescent to sparsely hairy below.
Leaves - Alternate, linear, narrowly-oblong to oblong. Can be very narrow in upper portions of stems but wider below.
Inflorescence - Solitary flower from leaf axils but usually in a spikelike fashion near end of stem.
Flowers - Corolla white, petals 4, 2-3.5 cm long, distinct. Ovary inferior. Stigma 4 parted. Calyx tube 1-2cm long.
Fruit - Capsule +/- 4mm thick, slightly winged with wings 1mm or so broad. Many seeded.
Flowering - May - June.
Habitat - Prairies, railroads, open woods.
Origin - Native to Southwest U.S., introduced into Missouri.
Other info. - This plant grew from a seed mixture which was sown to restore a natural prairie in Kansas City. I have not seen it elsewhere outside of cultivation.
Photograph taken at Schumaker Park, 6-28-99, and in Niagra Falls, Canada, 6-18-00.