A Grammatical Dictionary of Botanical Latin

biennial, “requiring two years to form its flowers and fruit, and then dying. Growing one year, flowering, fruiting, and dying the next” (Lindley); continuing two years; of two years, or two year’s duration; of two season’s duration: biennalis,-e (adj.B), biennis,-e (adj.B); cf. bimus,-a,-um (adj.A), two years old, of two years, continuing two years; cf. perennis,-e (adj.B), perennial, q.v., lasting throughout the year; cf. annuus,-a,-um (adj.A), annual, lasting a year, see annual;

- herbae erectae, ramosae, glabrae, biennes v. perennes (B&H),

- herba erecta, annua v. biennis, ramosa,

- herbae erectae, bienniales v. caule basi perennante, erect herbs, biennial or at the base with the stem over-wintering [i.e. perennial].

- herbae saepius erectae, ramosae, annuae biennes v. perennes, herbs more often erect, branched, annual, biennial or perrenial.

quasibiennis,-e (adj.B): almost biennial.