[Plate A: OUTLINE MAP OF ALGERIA SHOWING MAIN FEATURES OF SURFACE DRAINAGE Compiled by G. Sykes, Esq. F. R. G. S.] [Plate 1: Illustration: Fig. 1. View of the Oasis of Laghouat Illustration: Fig. 2. Wood market at Laghouat. Juniper, oak, pine, and other kinds of wood, each bunch a camel load, exposed for sale. Illustration: Fig. 3. Wood market at Laghouat. Roots of Zizyphus, branches of juniper and pine, and pine bark. The latter is said to be used for staining.] BOTANICAL FEATURES OF THE ALGERIAN SAHARA BY WILLIAM AUSTIN CANNON [Illustration: logo] WASHINGTON, D.C. PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 1913 CARNEGIE INSTITUTION OF WASHINGTON PUBLICATION NO. 178 PRESS OF J.B. LIPPINCOTT COMPANY PHILADELPHIA CONTENTS. * * * * * PAGE Introduction 1 Geographical Characteristics of Algeria 2 Climate of Algeria 6 Some Characteristics of the Vegetation of the Tell 15 The Forests of Algeria 18 The High Plateau 20 Boghari to Laghouat 20 Djelfa to Laghouat 22 Laghouat 23 The Oasis of Laghouat 24 The Plain 25 The Dunes near Laghouat 27 The Mountains about Laghouat 28 Effects of Grazing on Vegetation near Laghouat 29 From Laghouat to Ghardaia 31 Region of the Dayas 31 Daya of Tilrempt 32 The Chebka 34 Ghardaia 36 The Oasis of Ghardaia 38 The Plain (Hamada) of Ghardaia 39 The Mountains about Ghardaia 41 The Valley of the M’Zab 41 Protected Areas near Ghardaia 42 Root-Habits in the Ghardaia Region 44