XXIY. RHAMNACEiE 
89 
Leaves prominently 3— 5-nerved from the base 
Leaves feather- veined. 
Leaves toothed. 
Leaves alternate (except R. virgatus). Disk very thin. 
Ovary quite free ...... 
Leaves " opposite or nearly so (see also Rhamnus 
virgatus). Disk thick, surrounding the ovary 
Leaves entire. 
Branches without tendrils. Ovary 2 -celled, free 
Branches with terminal tendrils. Ovary 3-celled, ad- 
herent to the calyx ...... 
1, Zizyphus. 
3. Rhamnus. 
4. Sageretia. 
2. Berchemia. 
5. Helinus. 
1. ZIZYPHUS. From zizouf, the Arabic name of the Lotus, 
Z. vulgaris . — Tropical and temperate regions. 
Erect shrubs or small trees. Leaves alternate, usually shortly 
stalked, prominently 3-5-nerved from the base ; stipules persist- 
ent, spinous, sharp, usually unequal, sometimes only one. Flowers 
Fig. 29. Zizyphus oxyphyi.ua. 
unequally stalked, crowded in small, axillary cymes or clusters. 
Calyx 5-parted, tube short. Petals 5, deflexed ; disk thick, flat, 
filling up the calyx-tube. Stamens 5. Ovary immersed in the disk, 
2-celled ; style 2-branched. Drupe fleshy ; stone 1-2-celled. 
Flowers and lower surface of leaves tomentose . . 1. Z. Jujuba. 
Flowers and lower surface of leaves glabrous . . .2. Z. oxyphylla. 
