Sepals small, unequal, ovate or oblong-ovate, obtuse. Petals unequal. Fruit with 2 cells, more rarely with 3, one of which is smaller and 1-2-seeded.--Species 30. Tropical and South Africa. Some are used as ornamental plants. (Plate 16.) =Aneilema= R. Br. 7. Petals united below into a tube, but sometimes free at the base, blueish or reddish. Ovary 3-celled with 1-2 ovules in each cell. 8 Petals free or nearly so. 9 8. Stamens inserted towards the top of the corolla-tube. Petals united from the base.--Species 5. Tropical and South Africa. =Coleotrype= C. B. Clarke Stamens inserted at the base of the corolla. Petals free at the base.--Species 15. Tropical and South Africa. Some are used as ornamental plants. =Cyanotis= Don 9. Ovary 2-celled with 1 ovule in each cell. Fruit ovate. Filaments glabrous. Petals red or yellow. Inflorescence a panicle.--Species 9. Tropical and South-east Africa. Some are used as ornamental plants. =Floscopa= Lour. Ovary 3-celled. 10 10. Ovules 4-10 in each cell. Fruit oblong. Filaments glabrous. Petals whitish. Inflorescence a panicle.--Species 2. Central Africa. =Buforrestia= C. B. Clarke Ovules 1-2 in each cell. Fruit ovoid or globular. Stamens hairy. Inflorescence spike-, head-, or umbel-like. 11 11. Ovules 2 in each cell; in the dorsal cell sometimes solitary. Fruit subglobular. Stamens with a narrow connective. Sepals herbaceous, green. Inflorescence spike-or head-like. Stem long.--Species 3. Equatorial West Africa. =Forrestia= A. Rich. Ovule 1 in each cell. Fruit ovoid. Stamens with a broad connective. Sepals subpetaloid. Inflorescence umbel-like and surrounded by an involucre of two bracts. Stem short.--Species 1. West Africa (Congo). =Rhoeo= Hance SUBORDER PONTEDERIINEAE FAMILY 29. PONTEDERIACEAE Aquatic herbs. Flowers in spikes, racemes or panicles, without bracts, hermaphrodite. Perianth-segments 6, petaloid, white, yellow or blue, united below into a tube, rarely nearly free. Stamens 3 or 6, affixed to the perianth. Anthers oblong. Ovary superior, 1-or 3-celled, with numerous inverted ovules. Style simple. Fruit a loculicidal, many-seeded capsule. Seeds with a ribbed testa, a copious mealy albumen, and a long cylindrical embryo.--Genera 3, species 5. Tropics. 1. Stamens 3. Ovary 1-celled or incompletely 3-celled. Perianth funnel-shaped, with a distinct tube.--Species 3. Central Africa. =Heteranthera= Ruiz & Pav. Stamens 6. Ovary 3-celled. Perianth blue or violet. 2 2. Perianth funnel-shaped, with a distinct tube; Filaments thread-like. Anthers attached by the back. Stigma entire or shortly lobed.--Species 1. Tropics. Used as an ornamental plant. =Eichhornia= Kunth Perianth bell-shaped, with nearly free segments. Filament of the largest stamen toothed at the base. Anthers attached by the base. Stigma deeply cleft.--Species 1. Central Africa (Upper Nile and Kasai). Used as an ornamental plant, and in medicine. =Monochoria= Presl FAMILY 30. CYANASTRACEAE