Oenothera oakesiana (Gray) J.W. Robbins ex S. Wats. et Coult.
September 12,
Drained pond, Tidmarsh Farms, Plymouth
September 12,
Drained pond, Tidmarsh Farms, Plymouth Oakes' evening primrose
Subterminal appendages on sepals (appendages may be of variable
length: from 0.5 mm to about 0.5 cm); glandular hairs visible on pedicel.