UW Burke Herbarium species comparison

Leaves opposite, petiolate, ovate to elliptic, usually remotely denticulate or dentate, with marginal hairs, 2.5-7 cm. long and 1-4 cm. wide.

Inflorescence of terminal racemes and solitary flowers in the axils of upper leaves;

calyx usually glabrous, bell-shaped, the 4 lobes ovate to ovate-lanceolate, 5-6 mm. long;

petals 4, white, oblong, 10-20 mm. long, obtuse or rounded;

stamens 25-40, unequal;

styles as long as the stamens, fused most of their length, the 4 style branches stigmatic on the inner surface most of their length;

ovary mostly inferior.

Capsule woody, ovate-elliptic, pointed at the ends, 6-10 mm. long, 4 celled.