6. Corolla distinctly irregular. Mericarps with an almost semi-circular, cockscomb-shaped, palmately nerved dorsal wing. Bracteoles awl-shaped.--Species 1. West Africa. =Rhinopteryx= Nied. [Illustration: MALPIGHIACEAE. _FLOW PL. AFR._ _Pl. 77._ J. Fleischmann del. Acridocarpus macrocalyx Engl. _A_ Part of branch with fruits. _B_ Leaf. _C_ Flower cut lengthwise. _D_ Mericarp. _E_ Mericarp cut lengthwise.] [Illustration: POLYGALACEAE. _FLOW. PL. AFR._ _Pl. 78._ J. Fleischmann del. Securidaca longepedunculata Fresen. _A_ Branch with flower-buds. _B_ Flower (from which one of the lateral sepals has been removed). _C_ Flower without the perianth, cut lengthwise. _D_ Group of fruits. _E_ Fruit cut lengthwise.] Corolla regular. Mericarps with a more or less parallel-nerved dorsal wing.--Species 20. Tropical and South-east Africa. Some species are used as ornamental plants or in medicine. (Plate 77.) =Acridocarpus= Guill. & Perr. 7. Styles very long, divaricate; stigmas small, capitate. Stamens 10. Petals with a very short claw. Sepals with very scantily developed glands.--Species 4. Central and South-east Africa. =Sphedamnocarpus= Planch. Styles short or rather short, erect or slightly divergent; stigmas obliquely truncate, hooked, or broadened. 8 8. Stigmas broadened, semi-orbicular. Ovary with 3 tufts of hairs. Stamens 11-15. Petals with a very short claw. Sepals without glands.--Species 1. Madagascar. =Tricomariopsis= Dubard & Dop Stigmas not broadened. Stamens 10. 9 9. Styles hooked at the apex, bearing the stigma at the bent. Petals with a distinct claw. Sepals with glands.--Species 1. West Africa. =Heteropteris= Juss. Styles not hooked above, bearing the stigma at the obliquely truncate tip. Petals with a very short claw. Sepals without glands.--Species 1. Madagascar. (Under _Sphedamnocarpus_ Planch.) =Banisterioides= Dubard & Dop 10. (3.) Styles shorter than the ovary. Stigma terminal. Petals with a short claw. Calyx without glands. Mericarps with an undivided side-wing. 11 Styles longer than the ovary. 12 11. Ovary 2-celled. Petals slightly toothed. Leaves alternate.--Species 1. East Africa. =Diaspis= Nied. Ovary 3-celled. Mericarps with an air-cavity extending all round. Leaves usually opposite and crowded upon dwarf-shoots.--Species 4. East Africa. =Caucanthus= Forsk. 12. Petals sessile, entire. Calyx without glands. Styles 3, very long, with the stigma on the inside of the thickened apex. Mericarps with an undivided side-wing.--Species 1. West Africa to the upper Nile. =Flabellaria= Cav. Petals clawed. 13 13. Petals with a very short claw, entire. Calyx without glands. Styles 3, rather short, with a 2-lobed stigma. Flowers polygamous-dioecious, in umbels. Mericarps with a 3-parted side-wing.--Species 5. Madagascar. =Microsteira= Bak. Petals with a long or rather long claw. Style long. Flowers usually hermaphrodite. 14