18. Stamens inserted inside the disc; filaments short, not exceeding the calyx; anthers linear. Sepals 5-6, hairy above. Seed 1, with an aril. Leaves abruptly pinnate, with 4-10 leaflets.--Species 2. East Africa. =Haplocoelum= Radlk. Stamens inserted at the edge of the disc, 5; filaments long, much exceeding the calyx; anthers oblong or oval. Sepals 5. Leaves with a narrowly winged rachis.--Species 4. Central Africa. =Pistaciopsis= Engl. 19. Sepals imbricate in bud, finally slashed. Stamens 8-10, bent twice in the bud. Ovary 3-celled. Seeds with an aril; embryo almost straight. Trees. Flowers in axillary racemes or panicles.--Species 2. Central Africa. Flowers fragrant, used for preparing an aromatic water. =Lecaniodiscus= Planch. Sepals valvate in bud. Stamens 8. 20 20. Ovary 2-celled. Fruit indehiscent. Seeds with an aril. 21 Ovary 3-celled. 22 21. Fruit covered with wart-like protuberances. Aril free from the seedcoat.--Species 1 (_L. chinensis_ Sonn.) Cultivated in the tropics and naturalized in the Mascarene Islands. It yields timber, edible fruits, and medicaments. (Under _Nephelium_ L. or _Euphoria_ Commers.) =Litchi= Sonn. Fruit covered with soft spine-like processes or glabrous. Aril adnate to the seed-coat.--Species 1 (_N. lappaceum_ L., Rambutan). Cultivated in the tropics. It yields edible fruits and fat-containing seeds. (Under _Euphoria_ Comm.) =Nephelium= L. 22. Fruit dehiscent. Seeds with an aril. Calyx cup-shaped. Flowers in axillary panicles.--Species 1. Mascarene Islands. Yields timber (iron-wood), edible fruits, and oily seeds. (Under _Nephelium_ L.) =Stadmannia= Lam. Fruit indehiscent. Seeds without an aril. Calyx top-shaped. Flowers in racemes or panicles springing from the older parts of the stem.--Species 3. Central Africa. =Placodiscus= Radlk. 23. (14.) Calyx 5-lobed; lobes open or slightly imbricate in bud. Stamens 6-10. 24 Calyx 5-parted. 27 24. Calyx urn-shaped. Petals with a scale adnate by a ridge. Fruit indehiscent, 3-lobed, with a leathery pericarp. Seeds without an aril. Inflorescences arising from the older branches. Leaves pinnate. (See 13.) =Chytranthus= Hook. fil. Calyx cup-or saucer-shaped, small. Petals with a scale adnate by the margins, or with a free scale, or without a scale. Fruit dehiscent. Seeds with an aril. 25 25. Petals hairy, without a scale or with the inflexed margins prolonged into small scales. Ovary lobed. Pericarp leathery. Leaves simple, undivided, oblong.--Species 4. East and South Africa. They yield timber, edible fruits, and oily seeds. (Under _Sapindus_ L.) =Pappea= Eckl. & Zeyh. Petals with a free scale or with a scale adnate by the margins. Leaves pinnate. 26 26. Petals with a scale adnate by the margins, hence funnel-shaped. Disc clothing the base of the calyx. Filaments hairy. Fruit 3-angled, almost glabrous. Inflorescences axillary.--Species 5. Central Africa. Some yield timber. (Under _Blighia_ Koen.) =Phialodiscus= Radlk.