CKASSl'LACEAK OF KIIODKSIA. 187 



ill Crassulaccae. To give only oiie instance : In the whole of 

 Tropical Africa only 21 species of Crassula (including* Tillaea) 

 are known to ine, against about 180 in Temperate South Africa. 

 Tropical Africa and Madagascar are the headquarters of the 

 genus Kalanchoe (in which 11. Ilamet has sunk the genus 

 Bryop/iyUujji), Asia, Oceania and America possessing- only a 

 few rare species. Seinperclcum and Sedum have evidently 

 penetrated from the north, while the distribution of the species 

 of Crassula and Cotifledon is favourable to the view that the 

 genus lias spread into Tropical Africa from Temperate South 

 Africa. It will be seen from the subjoined list ihat, judging 

 by our present knowledge, the number of Crassulaccae in 

 Rhodesia is very small and reflects the general distribution. 

 Species of Bri/op/iylluiii (now placed under Kalanchoe), Sedum 

 and Sempervivi/iri are absent. Cotijledon is very poorly 

 represented. There is nothing in the configuration of the 

 countrv', nor in the climate, that, as far as we can judge, is' 

 in any way a hindrance to the growth of numerous 

 Crassulaccae, and, as there is an almost complete absence of 

 endemism, we may be allowed to conclude that at all events the 

 Crassulas have reached the country at a comparatively recent 

 period. 



Eyles, in Trans. Rotj. Soc. S.A., vol. v (1916), lists from 

 Southern Ilhodesia seven species of Kalanchoe and four species 

 of Crassula. Unfortunately, they do not seem to have been 

 submitted to specialists. Kalanchoe crenata Haw., which he 

 mentions, is a synonym of K. laciniata DC. ; K. pllosa Bak. 

 and K. glandulosa Ilochst. are synonyms of K. lanceolata 

 H. Pers. Crassula silvaiica Licht., which he enumerates as 

 Crassula sarcolipes llarv., is not likely to occur in Rhodesia. 

 I venture to suggest that it is the same species which is men- 

 tioned below as Cr. furcata Schonl. Both are pubescent and 

 have obovate leaves, but there are differences in floral structure. 

 Tillaea pharnaceoides Tlochst., though often quoted as a 

 synonym of Crassula campestris (E. et Z.) HarA'., is better kept 

 .separate. Cr. nivalis (E. et Z.) Ilarv. is not likely to occur 

 in Rhodesia, (jalpin 7309, on which Eyles' record is based, 

 was collected at Oxton, AA'hittlesea, Cape Colony, and not at 

 the Victoria Falls. 



Provisional List of Cra^sulaceae Found in Rhodesia. 



Cotyledon, (jlandulosa. N.E.Br., in Kew Bulletin, 1913, 

 p. 300, Northern Rhodesia, without locality, G. Simpson- 

 Hay ward. 



C. Wic/icnsii Schonl., without locality. Foliis latis 

 obovatis basi cuneatis, Teague, 169. Also found in Transvaal, 

 the home of the type. 



Kalanclioe laciniata C. II. Pers. (A', crenata Haw.), 

 Victoria Falls (teste Eyles). 



A', lanceolata H. Pers. {K. f/landulosa Hochst., K. pilosa 

 Bak.), Livingstone, north bank of Zambesi. Rogers 7443, 5235, 

 5130, 5235. 



