Tristichaceae Willis, Philocrenaceae Bong. Habit and leaf form . Stem anatomy . Xylem without vessels. Reproductive type, pollination .
Fertile flowers hermaphrodite .
Inflorescence, floral, fruit and seed morphology . The terminal inflorescence unit when flowers aggregated, cymose. Androecium exclusively of fertile stamens. Endothecium developing fibrous thickenings. Microsporogenesis successive, or simultaneous.