Utricularia L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 296

2. Utricularia L. 1

Annual or perennial rootless herbs with horizontal stems and erect racemose inflorescences; terrestrial in damp places, with usually inconspicuous simple leaves, or aquatic with numerous conspicuous leaves which are divided into linear to filiform segments; leaves bearing small bladders which trap minute organisms. Calyx 2-lipped, divided almost to the base, usually accrescent; corolla 2-lipped, yellow; lower lip more or less spurred, with a gibbous palate; upper lip usually smaller. Capsule usually globose, circumscissile, indéhiscent or dehiscing by pores or slits. Seeds usually many.

The genus is predominantly tropical and most of the species native in Europe (3-6) are atypical in the development of winter buds (turions). The vegetative parts are usually very variable and the identification of non-flowering material is often impossible; many of the published records are, therefore, open to doubt.

1 Terrestrial; lower lip of corolla 3-lobed; bracts peltate; leaves entire 1. subulata 1 ± Aquatic; lower lip of corolla entire; bracts not peltate; leaves divided into linear to capillary segments

2 Seeds with an irregular wing; upper lip of corolla 3-4 mm

wide 2. gibba 2 Seeds not winged; upper lip of corolla at least 6 mm wide

3 Spur saccate or broadly conical, obtuse, not longer than

wide; leaf-segments without bristles 3. minor 3 Spur with at least the apical part narrowly cylindrical or subulate, usually ± acute, longer than wide; leaf-segments with bristles

4 Stems dimorphic, with either green ±palmately divided leaveswithout bladders or much reduced colourless leaves with bladders 4. intermedia 4 Stems all with green, ±palmately divided leaves with bladders

5 Lower lip of corolla with deflexed margin; pedicels 2-3 times as long as bract; glands inside the apex of the spur

on abaxial surface only 5. vulgaris 5 Lower lip of corolla ± flat, with undulate margin; pedicels

3-5 times as long as bract; glands inside the apex of the spur on both adaxial and abaxial surfaces 6. australis