Pol·len n. 1. Fine bran or flour. [Obs.] 2. Bot. The fecundating dustlike cells of the anthers of flowers. See Flower, and Illust. of Filament. Pollen grain ...
由 曾喜育 著作 · 2008 · 被引用 4 次 — Pollen-ovule ratio (P/O) of the angiosperms, the ratio of pollen grains to ovules, can reflect more indications than floral morphology for the breeding systems.