OUARGLA TO TOUGGOURT — VEGETATION. 



57 



About 75 kilometers from Ouargla, and on a plain similar to that just 

 referred to, "dhamran" (Traganum nudatum) was the most common 

 species, but was by no means abundant. The census of an area i6 by i6 

 meters, taken in a locality where dhamran was dominant, resulted in find- 

 ing 31 living and a few dead plants, probably all Traganum. It is to be 

 understood that the vegetation of the reg desert not far distant is much 

 richer, not only in species but especially in individuals, and also that the 

 plants are much larger. 



From 56 kilometers to about 71 kilometers from Ouargla the route lay 

 over more or less continuous dunes, where the leading species seen were 

 Aristida sp., Ephedra sp.. Euphorbia guyoniana, Limoniastrum gttyonianum, 

 and Traganum nudatum. 



In or about the edges of the chotts, which are the leading topographical 

 features of the region immediately south of Touggourt, the most common 

 species are Haloxylon sp., Salsola tetragona, Limoniastrum guyonianum, and 

 Arabis aphyla. Besides these forms, about 28 kilometers south of Toug- 

 gourt fine specimens of Halocnemon strobilaceum were seen growing in an 

 extremely salty situation, to the total exclusion of other species. Tamarix 

 also is to be found in and about salt spots near Touggourt. (See fig. 64.) 



Both Massart and Doumet-Adanson (Bull. Soc. Bot. France, 39, 1892) 

 have discussed the flora of the Touggourt-Ouargla region. The following 

 exhaustive list is given by the latter author as having been collected between 

 the two desert towns : 



Henophyton deserti. 

 Matthiola livida. 

 Malcolmia aegyptica var. 



linearis. 

 Maricandia cinerea. 

 Sisymbrium pendulum. 

 Savignya longistyla. 

 Reseda stricta. 

 R. arabica. 



Helianthemum sessiliflorum. 

 H. ellipticum. 

 Randonia africana. 

 Frankenia pulverulenta. 

 Silene nicoeensis. 

 Monsonia nivea. 

 Erodium glaucophylum. 

 Fagonia glutinosa. 

 F. frutescens. 

 Polycarpaga fragilis. 

 Gymnocarpus decandrus, 

 Retama retam. 

 Genista saharae. 

 Astragalus gumbo. 

 Anthyllis henoniana. 

 Neurada procumbens. 



Ammodaucus leucotrichus. 

 Mesembryanthemum sp. 

 Deverra chlorantha. 

 Nolletia chrysocomoides. 

 Senecio coronopifolius. 

 Anthemis monilicostata. 

 Tanacetum cinereum. 

 Ifloga fontanesii. 

 Centaurea purpuracea. 

 Amberboa omphalodes. 

 Rhantherium adpressum. 

 Atractylis flava. 

 A. prolifera. 

 A. microcephala. 

 Tourneuxia variifolia. 

 Catananche arenaria. 

 Spitzelia saharge. 

 Zollikoferia chondrilloides. 

 Z. squamosa. 

 Sorzonera nudulata. 

 Echium humile. 

 Echiochilon fruticosum. 

 Arnebia decumbens. 

 Statice pruinosa. 

 Limoniastrum guyonianum. 



Plantago ciliata. 

 P. psyllium. 

 Scrophularia saharaa. 

 Linaria fruticosa. 

 Euphorbia guyoniana. 

 Atriplex dimorphostegius. 

 Caroxylon tetragonum. 

 Echinopsilon muricatus. 

 Calligonum comosum. 

 Haloxylon articulatum. 

 Anabasis articulata. 

 Cornulacea monocantha. 

 Thymelea hirsuta. 

 Th. microphylla. 

 Aristida flaccosa. 

 A. pungens. 



Cyperus conglomeratus. 

 Ephedra fragilis. 

 Erythrostictus punctatus. 

 Scilla sp. 



Dipcadi serotinum. 

 Asphodelus pendulinus. 

 Ruppia maritimus. 

 Chara foetida. 



