Description
Key Characters:
Growth Form:
Aquatic, terrestrial, or epiphytic annual or perennial herbs of wet habitats, carnivorous, with special vegetative organs adapted for digestion of captured small insects or crustaceans.
Stems:
True roots and leaves absent, but stems modified in various ways to function as rhizoids, stolons, and leaf-like organs, all species with bladder–type traps.
Roots:
Roots absent.
Leaves:
Leaves absent.
Alternate, crowded into a basal rosette, sometimes with tubular trap–leaves arising from the rhizome.
Stipules absent.
Flowers:
Flowers in usually simple, bracteate racemes, bracts also usually present on peduncle, basifixed to medifixed, bracteoles 2 or absent.
Flowers bisexual (perfect).
Calyx zygomorphic, 2(4)lobed, usually more deeply cleft laterally, forming an upper and lower lip, persistent, accrescent.
Corolla zygomorphic, bilabiate, the lobes imbricate, yellow, violet, purple, or white, rarely red; the lobes imbricate, upper lip entire or 2-lobed, lower lip entire or 2–5-lobed, saccate or spurred and usually with a raised, ± gibbous palate.
Stamens 2; anthers monothecal or dithecal, the thecae usually confluent.
Ovary superior, 2-carpellate, 1-celled, placentation free-central or basal; ovules (2–)numerous, anatropous; style usually absent or very short; stigma unequally 2-lobed, papillate, wet.
Fruit:
Capsules globose to ovoid; dehiscent by longitudinal slits or valves; circumscissile or indehiscent.
Seeds (1–)numerous; small; endosperm absent.
Ploidy:
Habitat:
Elevation Range: