Genera of South African Flowering Plants. 
41 
Polygalaceae. 
The only South African genus not found in the TJit. and P. E. divs. is 
Securidaca L., which, however, is only found on the borders of the Tropics 
in the East. Mundia Kunth is a seashore plant extending from the West 
to the neighbourhood of East London. Polygala L. is generally distributed. 
Muraltia Neck, has its headquarters in the S.W. region, extending, however, 
to Natal and beyond to Nyassaland. 
Dichapetalaceae. 
DicJiapetalum Thouars. (Ghailletia DC.) is in South Africa restricted to 
the Transvaal and Bechuanaland. 
^uphorbiaceae (excl. Buxaceae). 
There are 42 genera recorded from South Africa, of which only 
Euphorbia L. is universally distributed. Arborescent forms of this genus 
are still common in the eastern parts of the Uit. and P. E. divs., and seem 
to have their western limit in the Humansdorp district near Hankey. The 
order radiates from the Tropics, especially from the North-East and East, 
gradually thinning out along the southern coast belt, but not penetrating 
far (apart from Euphorbia) into the central parts. Four genera are repre- 
sented by native species on the Cape Peninsula. In the Uit. and P. E. 
there are 15, in Natal at least 22. 
The following genera are endemic : Lachnostylis Turcz. (Swellendam to 
Port Elizabeth), Heywoodia Sim (coast forests of the Transkei and eastern 
Pondoland), Toxicodendron Thunb. (Little Namaqualand), Seidelia Baill. 
(G-riqualand West). 
The following extend from a north-eastern direction to the West of the 
Kei Kiver (in addition to Euphorbia L.) : AridrachneW. (Uitenhage, Greorge), 
Fhyllanthus L. (to Murraysburg and Uit. div.), Croton L. (to Uit. div.), 
Jatropha Thunb. (to Cookhouse and Uit. div.), Cluytia L. and Leidesia 
Mull. Arg. (along the coast belt to Cape Peninsula), Acalypha L. (to 
the Uit. div.), Adenocline Turcz. (to Hanover, G-raaff Reinet, and along the 
coast belt to the Cape Peninsula), Gelonium L. (to P. E. div.), Ctenomeria 
Harv. (to Kei mouth and in the Uit. div.), Excoecaria L. (to the Pirie 
forest). 
Mercurialis L. has become naturalised, one species occurring from the 
Uit. div. to Natal. 
Callitrichaceae. 
Callitriche L. has one native species in South Africa which is recorded 
from the Uit. div., the Albany div. and Natal. 0. verna L. is recorded by 
Zaklbruckner from the Oliphants River, Clanwilliam. 
