A Grammatical Dictionary of Botanical Latin

unisexual, of one sex, i.e. having only an androecium or a gynoecium, a perichaetium or perigonium, but not both together in one plant or flower, either staminate or pistillate only; bearing stamens or pistils but not both; imperfect (= unisexual): with stamens or carpels absent in the flower (Radford et al.); (hepatics) “with antheridia and archegonia borne on separate plants” (Paton); diclinous, imperfect (flower): unisexualis,-e (adj.B), diclinis,-e (adj.B), q.v.; cf. bisexual = perfect; see sex (flower);

bisexual = monoiceous, q.v.; (in bryophytes) “with antheridia and archegonia on the same plant” (Magill 1990); bisexualis,-e (adj.B).

dioecious, q.v., “unisexual, the male and female elements in different individuals” (Jackson): dioecius,-a,-um (adj.A), dioicus,-a,-um (adj.A).

- pedunculi axillares, in cymas uni-bisexuales divisi (B&H), the peduncles axillary, divided into uni- [or] bisexual cymes.

- flores unisexuales, flowers unisexual, i.e. having male organs in one flower, female in another.

- flores hermaphroditi v. rarius unisexuales (B&H), the flowers hermaphrodite [i.e. with stamens and pistils in the same flower] or more rarely unisexual.

- flores omnes fértiles v. pauci ad basin v. apicem spadicis abortu unisexuales (B&H), all of the flowers fertile or a few at the base or apex of the spadix by abortion unisexual.

NOTE: monoecious (q.v.) plants have imperfect flowers, but both sexes grow separately on the same plant; dioecious, q.v., “unisexual, with the two kinds of flowers on separate plants or in separate parts of the inflorescense” (Fernald 1950).