DROSERACEAE Aldrovanda L.

LXXI. DROSERACEAE View in CoL 2

Perennial, insectivorous herbs. Flowers regular, hermaphrodite, usually 5-merous. Sepals united at base; petals free; stamens; hypogynous ovary superior, 1 -celled; styles 2-5. Fruit a capsule.

Literature: L. Diels in Engler, Pflanzenreich 26 (IV. 112): (1906).

1 Rootless aquatic with whorled leaves 1. Aldrovanda 1 Roots present; leaves alternate or basal

2 Flowers white; stamens equal in number to the petals

2. Drosera 2 Flowers yellow; stamens twice as many as petals

3. Drosophyllum

1. Aldrovanda L. 1

Stems submerged, rootless; leaves whorled. Flowers axillary; stamens 5; styles 5.

1. A. vesiculosa L. View in CoL , Sp. PI. 281 (1753).

Leaves 10-15 mm, in crowded whorls of 6—9; each with a cuneate basal part, and terminating in 4-6 setaceous segments and an orbicular lobe, hinged along the midrib, which can close rapidly to entrap and digest small animals. Flowers shortly pedicellate, rarely produced in Europe and usually cleistogamous; petals 4-5 mm, greenishwhite. Perennation by persistent terminal buds. Usually in shallow, still water. Dispersed irregularly and sparsely over a large part o f Europe, mainly in the centre and east.?Au Bu G a Ge *He Hu It Ju Po Rm Rs (C, W, E).