Definission: Of plant duration, a plant whose life span extends over more than two growing seasons, c.f. annual, biennial, ephemeral, of flowering with respect to architecture, hapaxanthic, monocarpic, pleonanthic
Definission: Of seed bank longevity. Seeds germinate in the first favourable season after dispersal. Generally, seed bank longevity is <= 1 yr (no persistent seed bank).
