Botanical features of the Algerian Sahara

by William Austin Cannon

Fig. 34. Root-habit of Gymnocarpos fruticosum, from plain about 3km. north of M’Zab Valley, Ghardaia.

PLATE 15

Fig. 35. Root-habit of a mature specimen of Peganum harmala, from the floor of the M’Zab Valley near Ghardaia. The soil at the place is comparatively deep. (See text for further explanation.)

Fig. 36. Root-systems of Helianthemum sessiliflorum (right), Haloxylon articulatum, and Nolletia chrysocomoides (left), from the flood-plain of the Oued M’Zab, Ghardaia.

PLATE 16

Fig. 37. Shoot and root habit of Citrullus colocynthis. Oued M’Zab, Ghardaia.