Plants Collected in the Percy Sladen Memorial Expeditions. 359 



flora is peculiar, and in many respects unlike that met with elsewhere 

 in Little Namaqualand. It is distinguished by the abundance of 

 succulents, particularly Mesembryanthema, many of which appear to 

 be endemic and extremely local in their occurrence. Its crossing in 

 the summer is necessarily rapid owing to the lack of water, and away 

 from the main road it is little known. When a geographical classifi- 

 cation of the vegetation of Namaqualand is seriously attempted, the 

 Knechtsvlakte will probably be separated, though to what extent it 

 is at present impossible to say. The localities, Vaarsche Rivier, Klip- 

 kalk, and Bakhuis are situated within this area. 



Welwitsch, situated to the North of the Swakop River, is a typical 

 desert station whose vegetation, however, differs markedly from that 

 of the southern parts of the Namib. These differences include not 

 not only the comparative rarity of succulents, but also the presence 

 of so remarkable a type as Welivitschia. The latter character it shares 

 with many other stations near the sea between the mouth of the 

 Swakop River and San Nicolau, which lies near the northern limit of 

 the littoral desert. 



The principal localities visited by the expeditions, whose collections 

 yielded the Comjwsitae described in Mr. Hutchinson's paper, are given 

 in chronological order : — 



EXPEDITION I.* 



November, 1908 — March, 1909. 



Collector : H. H. W. Pearson. 



Localities: Ceres,t Calvinia,| Loeriesfontein,+ Kamabies,§ Tweefon- 

 tein,§ 0'okiep,§ Kweekfontein,^" Pella,^[ G-root Rozyn- 

 boschl", Wortel,^" Abbasis,*^ Raman's Drifts Henkries- 

 fontein,T[ 0'okiep,§ Sabies,^[ Raman's Drift,^[ Warm bad, || 

 G-riindoorn,|| Holoog,|| Seeheim,|| Angra Pequena || 

 (Liideritzbucht), Swakopmund,** Welwitsch.** 



* Journ. R. Geog. Soc, 1910, p. 481 ; Ann. S. A. Mus. vol. ix. 1911, p. 4. 



t Cape Region. 



+ Upper Region. 



§ Little Namaqualand. 



|| Great Namaqualand. 



^f Bushmanland. 



** Damaraland. 



