XXIV. KHAMNACE2E 
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Leaves prominently 3-5-nerved from the base . . . .1. Zizyphus. 
Leaves feather-veined. 
Leaves toothed. 
Leaves alternate (except R. virgatus). Disk very thin. 
Ovary quite free 3. Rhamnus. 
Leaves opposite or nearly so (see also Rhamnus 
virgatus). Disk thick, surrounding the ovary . 4. Sageretia. 
Leaves entire. 
Branches without tendrils. Ovary 2-celled, free . 2. Berchemia. 
Branches with terminal tendrils. Ovary 3 -celled, ad- 
herent to the calyx ...... 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 
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. Jujuha. 
Flowers and lower surface of leaves glabrous . . . 2. Z. oxyphylla. 
