Science Fair Project Encyclopedia
About 40, including:
Ziziphus is a genus of about 40 species of spiny shrubs and small trees in the buckthorn family Rhamnaceae, distributed in the warm-temperate and subtropical parts of the Old World. The leaves are alternate, entire, with three prominent basal veins, and 2-7 cm long; some species are deciduous, others evergreen. The flowers are small, inconspicuous yellow-green. The fruit is an edible drupe, yellow-brown, globose or oblong, 1-3 cm long, often very sweet and sugary, reminiscant of a date in texture and flavour.
The mythological lotus tree is often equated with Z. lotus, though the date is also a possible candidate.
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