Abbe (1935, 1974) studied floral vasculatures of all genera of Betulaceae and concluded that the ancestral inflorescences of Betulaceae were compound spikes consisting of cymes each with three flowers and the most primitive flowers are bisexual and trimerous with tricarpellary
Female flowers in date palm (Phoenix dactylifera L.) possess tricarpellary
apocarpous pistil consisting of three independent carpels, while rudimentary androecium is represented by two whorls of three staminodes each alternately arranged in antepetalous and antesepalous position (DeMason et al., 1982).
Both species have triangular ovaries in cross section, tricarpellary
with one erect ovule per loculus, fixed at the basal region and of axial placentation, as verified by Weckerle and Rutishauser (2005).
Its pistillate flowers have six staminodia joined to form a circle, syncarpic, tricarpellary
, trilocular gynoecium, one ovule to each locule, synascidiate in the ovary, and plicated above.