C.\TALo<;uK OF Vascular Plants of Tuansvaal and Swazii. \ni>. 'JoS 



three t)ccasions, in wiiirh luuueious \aliiable additions t«i <tin' kn<j\v- 

 ledge of the flora luive been made. 



Miss Leendertz has been doin-^; good service in working up tlie 

 flora of the immediate vicinity of Pretoria, and I hope she will V)e able 

 to continue in this, for the time has come when it is of the gre;itest 

 importance to gain a thorough knowledge of the flora of particular and 

 somewhat limited areas. 



Professor Dr. Engler \isited the Transvaal with the British Asso- 

 ciation in 190"), and spent a few days within the colony, making collec- 

 tions at Johannesburg, Pretoi'ia and along the ^lagaliesberg to Zeerust, 

 Ottoshoop and IMafeking. 



Dr. Emil Holub, who spent some seven years (1872-79) in South 

 Africa, between Capetown and the Zambesi, often remaining months 

 in one vicinity, collected a few i)lants in the Matebe Valley and at 

 Rapetse, about the western border of the Marico disti'ict, not far from 

 Linokana. These are in the Kew herbarium. 



Other collectors include : Miss Alice Pegler, now of Kentani, 

 Cape Colony, who gathered some interesting plants at Rustenburg ; 

 Miss 01i\e Nation, Rev. F. A. Rogers, Miss Collins, Mr. Crawley, Mr. 

 F. T. :\[enne, Mr. T. N. Leslie, Mr. Gilfillan, Mrs. Hutton, Mr. 8alt- 

 marshe, ^[r. T. Sanderson, Re\-. W. Greenstoek, Mr. Conrath, Capt. 

 Barrett-Hamilton, Mr. Frank Oates, Capt. H. T. Ommanney, Dr. R. 

 Frank Rand, I>r. Otto Kuntze, Mr. T. W. Kirk and Mr. T. C. Legge, 

 Dr. Sehonland and Dr. Marloth have also paid short visits to the 

 Transvaal. 



My own Transvaal collections include some 6000 specimens, but 

 contain comparatively few new species. I have not been able to gi\'e 

 any time to systematic collecting, and have had for the most part to 

 content myself with gathering whatever came to hand, on farm lands 

 and by roadsides, during rapid visits of agricultural inspection. 



Moreo\'er, instead of hunting for novelties, I have made a special 

 point of collecting primarily the Graminese and plants of economic 

 interest : secondly, plants typical of particular geological and ecological 

 formations ; and thirdly, specimens indicative of the geographical dis- 

 tribution of certain types. 



Treatment. 



In the preparation of the list the rules of the Vienna Congress 

 (1905) have been followed as closely as our knowledge of the literature 

 would permit. 



As far as possible the sequence of families and genera, and the 

 generic names accepted, are those of De Dalla Torre and Harms 

 Genera Siphoiioyamarum. Exceptions have been made in the case 

 of more recent revisions, f>.(/. those of Mr. N. E. Brown iov the 

 Asclepiadacea;, Mi-. C. B. Clarke for the Cyperaceaj and Acanthacea?, 

 and l)r. Stapf for the Gramineai. As regards the delimitation of 

 families, I have sti-ictly adhered to the Genera Siphonoyamarum, 

 which is based on Engler and Prantl's Pflanzenfamilien, and liave 



