324 122. EUPHORBIACEAE ^- I23. CALLITRICHACEAE — I24. BUXACEAE 



124. Flowers monoecious. Calyx 6-lobed. Stamens 3 ; filaments united ; 

 anthers opening outwards. Male flowers in glomerules. — Species i. 

 Naturalized in the Mascarene Islands. (Melanthesopsis Muell. Arg.) 



Breynia Forst. 

 Flowers dioecious. Caly.x 5-parted. Stamens 5 ; filaments free ; anthers 

 opening inwards. Male flowers in umbels. — Species i. Madai^'ascar. 



Leptonemea Juss. 



FAMILY 123. CALLITRICHACEAE 



Herbs. Leaves opposite, simple, entire. Flowers solitary or in clusters 



in the leaf-axils, minute, without a perianth, but sometimes with two bracteoles, 



monoecious. Stamens i. Anther 2-celled. Ovary 4-celled. Ovules solitary 



in each cell, pendulous, inverted, with a single coat and a ventral raphe. Styles 



2. free, awl-shaped. Fruit separating into 4 drupe-like mericarps. Seeds 



albuminous; embryo axile. {VvAqx HALORRHAGIDACEAE.) 



Genus i, species 6. North and South Africa and high mountains of Central 



Africa : one species also naturalized in Madagascar and the Mascarene 



Islands Callitriche L. 



ORDER SAPINDALES 



SUBORDER BUXINEAE 



FAMILY 124. BUXACEAE 



Shrubs or trees. Juice not milky. Leaves opposite, simple, entire. Flowers 

 in lateral fascicles heads or spikes, regular, monoecious. Perianth simple, of 4 

 segments in the male flowers, of 4 — 6 in the female. Disc absent. Stamens 4, 

 opposite the sepals, or 6. Filaments free. Anthers 2-celled. Ovary superior, 

 3-celled. Ovules 2 in each cell, pendulous or nearly so, inverted, with dorsal 

 raphe. Styles 3, free, short and thick, undivided, persisting in fruit. Fruit a 

 loculicidal capsule. Seeds albuminous ; embryo axile, straight. — Genera 3 ; 

 species 8. (Under EUPHORBIACEAE.) 



1. Stamens 4 ; filaments long. Male flowers with a rudimentary pistil. 



Perianth of the female flowers of 4 — 6 segments. — Species 0. The box 

 {B. sefupervircns L.) is used as a garden-plant and yields wood and 

 medicaments ; another species affords arrow-poison. [Tribe BUXEAE.] 



Buxus L. 



Stamens h ; filaments very short or absent. Male flowers without a 



rudimentary pistil. Perianth of the female flowers ot 4 segments. 



[Tribe STYLOCEREAE.] 2 



2. Flowers in fascicles, the male on long pedicels, very small. Leaves nar- 



rowed into a long point. — Species i. Central Africa. 



Macropodandra Gilg 



Flowers in groups of 3, nearly sessile, not very small. Leaves bltint or 



shghtly pointed. — Species i. South-east Africa. . Notobuxus Oliv. 



