CXXIT, EUPHORBIACER (BROWN AND HUTCHINSON). 445 
**Ovary or female flower, when present, with a cup-like calyx 
at its base, not enclosed in an involucre, but half 
surrounded by 4 involucres formed of free bracts, 
containing the stamens supported on the 4 lobes of an 
open hand-like common involucre which spreads on one 
side of it. : : : . . . . s 7. ANTHOSTEMMA. 
Tripe Il. Buxezse. Perianth calysx-like. Segments imbricate or (in some 
extra-African species) absent. Stamens opposite the segments, in the African 
genera 4 or 6. Ovules 2 in each cell, rarely solitary; raphe dorsal. Styles 
undivided or slightly bifid. Cotyledons various, Shrubs or trees with opposite 
entire leaves (African species), 
Stamens 4, opposite the segments . ° ° - 8&8. Buxts. 
Stamens 6, two single opposite the outer segments, four 
in pairs opposite the inner. . . . . - 9. NOTOBUXUS, 
Tripe III. PhylNantheze. Sepals valvate or imbricate in bud, in 1-2 
series. Petals when present small and scale-like. Stamens in 1-2 series, the outer 
opposite the sepals, rarely indefinite in the centre of the flower, Ovules 2 in 
each cell (in Martretia ‘he ovary is 2-celled, each cell partially divided by a false 
seplum between each ovule), collateral and usually contiguous ; earuncle usually 
conspicuous ; raphe ventral. Cotyledons much broader than the radicle. In- 
Norescence various, avillary, rarely paniculate and terminal. 
*Sepals of the male flowers valvate in bud. 
Flowers in axillary fascicles or glomerules, rarely in 
spicate clusters or short racemes; petals present, 
very rarely absent; ovary-cells not divided by 
false septa. 
Fruits drupaceous; ovary 2-celled; tertiary nerves 
of the leaves usually parallel —. : . . 10. BRIDELIA. 
Fruits capsular; ovary 3-celled; tertiary nerves 
usually not parallel. : : - . 11. CLEISTANTHTS. 
Flowers in racemes; petals absent; " ovary-celle par- 
- tially divided by a false septum . . . . 24, MARTRETIA, 
*Sepals of the male flowers imbricate in bud. 
Leaves digitately compound. 
Leaves opposite; leaflets stalked. : . - 12, OLDFIELDIA, 
Leaves alternate; leaflets sessile or subsessile. 
Fruits dehiscent; leaflets 1-3. . : . 13. ARISTOGEITONTA. 
Fruits indehiscent ; leaflets 5-7 . 5 x . 14. PATVEUSA, 
Leaves simple. 
tPetals present in the male flowers. 
Inflorescence paniculate ; capsule loculicidal. 
Panicles terminal and clustered at the apices of 
the shoots; disk in the male flowers con- 
sisting of separate glands. . : . 15. MEGABARIA. 
Panicles axillary; disk in the male flowers 
cupular ss, ‘ : . 16. CENTROPLACTS. 
Inflorescence spicate, racemose or fasciealate, 
Styles absent; stigmas sessile, thick, entire . 17, AMANOA. 
Styles well developed, usually divided, 
Male flowers in spikes or racemes e . 26. THECACORTS, 
Male flowers in axillary fascicles, 
