Utilization of the relatively sparse vegetation of the desert in Sinai and the Negev is one of the more impressive aspects of bedouin adaptation to environmental conditions there. We encountered no plant that was not useful to the bedouins in one way or another. For example, pasture for goats and camels being the most extensive use of plants, a bedouin shepherd, knowing that Thymelaea hirsuta (see Index for authorities and bedouin name) is poisonous, might relate that it has no use at all. The same shepherd, however, when making a partridge trap, will use the moist roots of this plant for parts of the trap that must be both flexible and strong (Bailey and Yahav, 1974). When sowing summer crops, moreover, he affixes a branch of Thymelaea to the back of his plow where it sweeps sand over the furrow to shield freshly-sown seeds from the sun's direct rays. His wife, too, when watering her flock, often utilizes Thymelaea fibers to make a bucket-rope with which she can draw water from the well. In many plants bedouins find a source of nutrition; 70 such species are included in the present survey. Some plants provide them with medicine for the ills of man and beast; 50 of this category are included. The bedouins also utilize plants in a variety of manufactures, some of which are essential to their daily existence. The prominence of desert plants in bedouin life is reflected in various less tangible aspects of bedouin culture. For example, a solemn oath heard among them goes: "By the life of the plant and our worshipped Lord" (hayat al-'uid warrabb al-ma'btud). Bedouin convention, moreover, prohibits the cutting down of desert trees and bushes, such as the various Acacia, Pistacia and Retama, whose branches provide shade to the shepherdesses and firewood for the camp, and whose fruits provide fodder for the flocks. A bedouin proverb explains that "the cutting of trees (in a given region) will eliminate the possibility of living there" (gat' ashjar yigta' ad-diyar). A betrothal among bedouins is concluded by the father of the bride merely handing the groom the broken stem of an annual plant. This ceremony, called algasalah, signifies the formation of a covenant between the two families (Bailey, 1974a). At bedouin marriages and other celebrations the bedouins fasten sprigs of green plants, such as the Retama raetam, to the entrance of the tent, as an expression of hope that its inhabitants will continue to live. Green, the color of live plants, is a symbol of life and vitality. Accordingly, therefore, bedouins describe a generous and helpful person as "having a green face" (wijhih akhdhar). Bedouins, moreover, anticipate the flowering of certain plants as indications of seasonal changes that are vital to their survival. For example, considering that the winter rains begin after the annual rising of the star, Canopus, in October, they watch for the flowering of the Urginea maritima, which they call "the
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