Early summer A day-flowering member of the evening-primrose family, resembling the golden sundrops of our June meadows.
Wright, Mabel Osgood, The Garden, You, and I(2010)
The capsules of the sundrops are somewhat club-shaped and four-winged, angled above, with four intervening ribs between.
Blanchan, Neltje, Wild Flowers—An Aid to Knowledge of...(2010)