310 122. EUPHORBIACEAE 



3. Male flowers with a cupular, entire or 3 — 6-lobed perianth. Female 



flowers with a 3 — 4-toothed or -cleft perianth. Trees or shrubs. . . 4 

 Male flowers without a perianth 5 



4. In\'olucrc of the partial inflorescences split at one side and consisting of 4 



or more bracts. Ovary 3-celled. Style 3- or 6-cleft. Trees. — Species 

 3. Tropics. Poisonous and used medicinally. . . Anthostema Juss. 

 Involucre closed all round and consisting of 4 bracts. Ovary 4-celled. 

 Style 4-parted. — Species 3. Equatorial West Africa. 



Dichostemma Pierre 



5. Involucre of the partial inflorescences with unequal lobes and with an 



appendage, in the axil of which the glands are inserted. Shrubs. — 



Species 2. Madagascar Pedilanthus Neck. 



Involucre with e(]ual lobes, but sometimes surrounded by a one-sided 

 gland 6 



6. Involucre irregular, with a single gland sometimes embracing the partial 



inflorescence and split at one side only 7 



Involucre regular, with several glands sometimes united into a ring or 

 cup 9 



7. Involucre with a' narrow gland not enveloping the partial inflorescence. 



Female flowers with a perianth. Bracts subtending the involucres united 



high up. Spiny shrubs. — Species i. East Africa. Stenadenium Pax 



Involucre with a broad gland enveloping the partial inflorescence. Herbs. 8 



8. Female flowers with a perianth. Bracts subtending the involucres united 



at the base. — Species 2. East Africa. (Under Monadenmm Pax). 



Lortia Rendle 



Female flowers without a perianth. Bracts subtending the involucres 



united high up. — Species 10. Central Africa. . . Monadenium Pax 



9. Glands of the involucre united into a ring or cup. — Species 10. Tropical 



and South-east Africa. Some are poisonous. . . Synadenium Boiss. 

 Glands of the involucre separate 10 



10. Fruit a drupe. — Species i. West Africa. (Under Euphorbia L.) 



Elaeophorbia Stapf 



Fruit a capsule. — Species 320. Many of them are poisonous, some yield 



timber, gum, rubber, oil, and medicaments, or serve as garden- or 



hedge-plants. " Spurge." Euphorbia L. 



11. (2.) Filaments bent inwards in the bud. Calyx 4 — 6-partitc, imbricate 



or subvalvate in bud. Corolla present, at least in the male flowers. 

 Inflorescence spike- or raceme-like. Leaves and young shoots clothed 

 with scales or stellate hairs. — Species 100. Tropical and South Africa. 

 Several species are poisonous, some yield gum-lac, incense- wood, oil, 

 and medicaments, or serve as ornamental plants. | Tribe CROTON- 



EAE.] . Croton L. 



Filaments straight in the bud 12 



