A slender plant resembling the common Evening Primrose but usually less branched and more slender-stemmed, 2 to 3 feet high, the stem puberu-lent and covered with scattered hairs which are enlarged at the base. Leaves lanceolate, mostly narrower than those of Oenothera biennis, slightly repand-denticulate or entire. Flowers light yellow, 1 to 2 inches broad; petals rhombic-obovate and blunt at the apex. Capsules hairy, narrowly oblong-cylindric, about 1 inch long, slightly curved and shorter than the persistent leaflike bracts which subtend them.

Sandy or gravelly soil, Newfoundland to southeastern New York and New Jersey. Flowering from July to September.

Memoir 15 N. Y. State Museum

Plate 146

Northern Evening Primrose   Oenothera muricula

Northern Evening Primrose - Oenothera muricula