III. PHYSICAL AND VEGETATIONAL ASPECTS OF THE SAHARA
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Fig. 19. A tuft of Perralderia coronopifolia in the shelter of a rock. The finely
divided leaves are very toxic.
Fig. 20. Lotus roudairei, a silky plant with leaves which appear gray because
of the presence of numerous small fibers or down.
the aerial portion of the plant. The length of the roots can be astonishing
(Kachkarov and Korovine, 1942). Small grass that are a few centimeters high can have a root that is more than 1 meter long.
141
Fig. 19. A tuft of Perralderia coronopifolia in the shelter of a rock. The finely
divided leaves are very toxic.
Fig. 20. Lotus roudairei, a silky plant with leaves which appear gray because
of the presence of numerous small fibers or down.
the aerial portion of the plant. The length of the roots can be astonishing
(Kachkarov and Korovine, 1942). Small grass that are a few centimeters high can have a root that is more than 1 meter long.