[Plate 10:
Illustration: Fig. 24. Leaf-habit of Dæmia cordata. Ghardaia.
Illustration: Fig. 25. Shoot-habit of Salvia ægyptica. Ghardaia.
Illustration: Fig. 26. Upper surface of rocks, showing small
incrusting lichens, on a low mountain about 5km. north of the M’Zab
Valley, Ghardaia.]
[Plate 11:
Illustration: Fig. 27. Habitat of Peganum harmala, at Melika,
Ghardaia.
Illustration: Fig. 28. Shoot and leaf habit of Peganum harmala, from
Ghardaia.]
[Plate 12:
Illustration: Fig. 29. Habit of Henophyton deserti at Ghardaia when
growing in a protected situation (cemetery).