15. Spadix with a terminal appendage. Spathe erect. Stamens 3-6.--Species 1 (_C. antiquorum_ Schott, taro or dinde). Cultivated and sometimes naturalised in Tropical and North Africa. The tubers and leaves are eaten and used in medicine; also an ornamental plant. (Under _Caladium_ Vent.) =Colocasia= Schott Spadix without an appendage. Spathes recurved at the top. Stamens 2-3.--Species 1. Island of Socotra. Used as an ornamental plant. =Remusatia= Schott 16. Style disc-like, adnate to the styles of the neighbouring flowers. Ovules with a long funicle. Leaves leathery.--Species 2. Cultivated and sometimes naturalised in West Africa and the Mascarene Islands. Used as ornamental plants or vegetables. =Xanthosoma= Schott Style none. Ovules with a short funicle. Leaves herbaceous, usually with red spots.--Species 1. Cultivated and sometimes naturalised in West Africa. Used as an ornamental plant. =Caladium= Vent. 17. (8.) Stem above ground and usually climbing or underground and creeping. Spadix without an appendage. Ovary 1-2-celled with 1 ovule in each cell. 18 Stem underground, short and thick, more or less tuberous. Juice milky. 23 18. Juice milky. Leaves cordate or sagittate. Female inflorescence not adnate to the spathe. Ovary 1-celled. [Tribe NEPHTHYTIDEAE.] 19 Juice not milky. Leaves lanceolate oblong or elliptical, acute or obtuse at the base, rarely cordate and then female inflorescence adnate to the spathe or ovary 2-celled. Seed albuminous. 22 19. Stem underground, creeping.--Species 3. West Africa. Used as ornamental plants. (Including _Oligogynium_ Engl.) =Nephthytis= Schott Stem above ground, climbing, woody. 20 20. Leaves perforated or dissected. Male inflorescence three times as long as the female and contiguous to it. Ovary with a strongly projecting parietal placenta.--Species 2. West Africa. =Rhektophyllum= N. E. Brown Leaves entire or lobed, not perforated. Ovary with a slightly projecting parietal or sub-basal placenta. 21 21. Leaves oblong, shortly cordate at the base. Male inflorescence twice as long as the female and contiguous to it. Stamens 2-3.--Species 1. West Africa (Cameroons). (Under _Cercestis_ Schott). =Alocasiophyllum= Engl. Leaves sagittate or hastate. Stamens usually 4.--Species 7. West Africa. =Cercestis= Schott 22. Stem creeping. Female inflorescence adnate to the spathe, as long as the male. Ovary conical. Style present.--Species 1. Central Africa. Used as an ornamental plant. [Tribe CALLOPSIDEAE.] =Callopsis= Engl. Stem climbing or erect. Female inflorescence free from the spathe. Ovary subglobose. Style wanting.--Species 17. Central Africa. Some are used as ornamental plants. [Tribe CULCASIEAE.] =Culcasia= Beauv.