22 
Transactions of the Royal Society of South Africa. 
either a decided eastern or decided western distribution), Im})erata Cyr.^ 
and Enneavogon Desv. (recorded in the south-west coast region only from 
the Knysna). Of the genera of decidedly south-western distribution the 
following are absent: Prionanthium Desv., Pentameris Beauv., Chaeto- 
hromus Nees, Poagrostis Stapf, Trisetum Pers., Urochlaena Nees, while 
Brizopyrum Nees, and Scleropoa G-riseb. have near Port Elizabeth their 
eastern limit, and Aira L., Avenastrum Juss., Ehrharta Thunb., Lasiochloa 
Kth., Vulfia G-mel. extend still further east. {Aira and Ehrharta are 
found also on the mountains of Tropical Africa.) Atropis angusta Stapf, 
which the author thinks has come from " saline places by the Zwartkops 
River " has not been found by recent collectors. Of the genera which 
are entirely or mainly Central the following are absent : Brachypodium 
Beauv., Arundinaria Mich., Tetrachne Nees, Orojoetium Trin., Secale L. 
There are about twenty-three genera in South Africa which have an exclu- 
sively eastern distribution (some extending into the Kalahari region). These 
are absent with the exception of Elionurus Humb. et Bonpl. (reaching its 
western limit at the Zwartkops P.), Oplismenus L. (western limit Spring- 
fields, near Uitenhage), Chloris Sw. (distribution west of Uitenhage insigni- 
ficant). 
Cyperaceae. 
On the whole the delimitation of genera by C. B. Clarke in the 'Flora 
Capensis ' has been followed, though here and there it is very unsatisfactory. 
Thus Pycreus Beauv. is not sharply divided from Cyperiis Linn., Firnhri- 
stylis Vahl, and Bulbostylis Kunth grade into one another, and Scirpus 
Linn, and Ficinia Schrad. should be united. 
(a) Fairly generally distributed (all represented in the Uit. and P. E. 
divs.) : 
Kyllinga Rottb., Pycreus Beauv., Cyperus L., Fimhristylig Yahl, 
Scirpus L., Carex L. The following are absent from the western 
region and western parts of central region : Mariscus Graertn., Eleo- 
charis P. Br., Bulbostylis Kunth, Ficinia Schrad., Fuirena Pottb., 
Schoenoxiphium Nees. 
(b) Mainly northern and north-eastern: 
Lipocarpha P. Br., Mhynchospora Vahl (also found at Grahamstown 
and on Table Mountain), Costularia. C.B.Cl., Gladium P. Br. (also at 
Van Stadens and Krakakamma), Scleria Berg, (extends to Komgha 
division), Eriophorum L., and Eriospora A. Pich. (Transvaal only). 
(c) Mainly or entirely in the south-west 
Carpha P. Br. (extends to Somerset East and P ondoland) , Ecklonea 
Steud. (Cape Peninsula and Bains Kloof), Epischoenus C.B.Cl. (Cape 
Peninsula to Piversdale), Tetraria Beauv. (extends to Somerset East 
