Life Cycle:
introduced perennial, reproducing by seed and occasionally by rootstocks
Stems:
upright, branching, pubescent
Leaves:
opposite, ovate-lanceolate, pubescent, margined petioles below, sessile above
Flowers:
5-petaled, white to sometime pinkish, "bladder -like"; petals notched; male and female on separate plants; calyx inflated, hairy, prominently veins (10 male or 20 female); open in evening; stalked and axillary
