314 122. EUPHORBIACEAK 



— Species 2. Cultivated in the tropics. They yield rubber (para-rubber): 



{Siphonia Schreb.) Hevea Aubl. 



Calyx closed in bud. Stamens 3 — 10 ; filaments free or united at the 

 base only. Styles distinctly developed. Leaves simple, undivided. 39 



39. Male flowers with a rudimentary pistil. Stamens 6 — 10. Filaments free, 



bent twice. Styles divided into many branches. Flowers monoecious. 



Shrubs with stellate hairs 40 



Male flowers without a rudimentary pistil. Filaments united at the base. 

 Styles undivided or with 2 branches. Flowers usually dioecious. . 41 



40. Sepals of the female flowers 6, entire, united halfway up. Styles free. — 



Species i. Island of Socotra. (Under QepJmlocrolun Höchst.) 



Cephalocrotonopsis Pax 



Sepals of the female flowers pinnately dissected. Styles united at the 



base. — Species 8. East Africa to Transvaal, Madagascar, and German 



South-west Africa Cephalocroton Höchst. 



41. Styles at first united, finally free. Seeds with an outgrowth at the hilum. 



Glabrous shrubs. Leaves 3 — 5-nerved at the base. Male inflorescences 

 catkin-like, springing from the old wood. — Species 5. Tropics. Some 



yield dye-stuffs Lepidoturus Baill. 



Styles free or nearly so. Seeds without an outgrowth. Male inrtorescences 

 spike- or panicle-like, axillary 42 



42. Styles united at the base, two-cleft. Trees, l^eaves penninerved. — 



Species 2. Madagascar. (Including Orfilea Baill., under Alchornea 

 Swartz) Lautembergia Bail!. 



Styles free, undivided. — Species 10. Tropics to Delagoa Bay. Some 



of them yield dye-stuffs Alchornea Swartz 



43» (37-) Styles laciniate. Ovary nearly glabrous. Disc in the male flowers 

 consisting of glands situated outside the stamens, in tlie female in- 

 distinct. Sepals 5. Trees. Leaves penninerved, without stipules. 

 Flowers dioecious, the male in clusters arising from the old wood, the 

 female in axillary racemes. — Species i. East Africa. 



Crotonogynopsis Pax 



Styles two-cleft or undivided, but u.-ually ciliate within. Ovary usually 

 hairy. Disc indistinct in tlie male flowers. Sepals 2-4, ver}^ rarely 5. 

 Flowers in spikes or panicles 44 



44. Styles two-cleft 45 



vStyles undivided 47 



45. Flowers dioecious, in panicles. Calyx of the male flowers 2-partite. Disc 



indistinct. Plants clothed with stellate hairs. Leaves palminerved. — 



Species 5. Central Africa Neoboutonia Muell. Arg. 



Flowers monoecious, all or the female in spikes. Cal^^x of the male flowers 

 4 — 5-partite. Disc distinctly developed in the female flowers. Trees. 

 Leaves penninerved 46 



46. Disc of the female flowers expanded. Styles thick. Leafstalk rather 



short. Stipules lanceolate, persistent. — Species i. West Africa. 



Necepsia Prain 



