86 THE JOURNAL OF BOTANY 



degree of specialization. It must also be remembered that the mor» 

 primitive Angiosperms, which entered the water at an early period, 

 had merely to take possession of an undisputed field, whereas plants 

 embarking on an aquatic life at the present day are exposed to acute 

 competition from the numerous well-established hydrophytes with 

 which the fresh waters of the world are already so fully stocked. 

 Balfour Laboratory, Cambridge. 



ALABASTRA DIVERSA.— Part XXX.* 

 By Spencer Le M. Moore, B.Sc, F.L.S. 



(Continued from Journ. Bot. 1918, p. 212.) 

 1. Plants RoGERSiANiE. — IV. 



The following is a further instalment of notices concerning and 

 descriptions of Archdeacon Rogers's African plants. The localities 

 are chiefly Rhodesian and Northern Transvaal, and there are a few 

 specimens from Bechuanaland. Among the Transvaal localities the 

 little-known Zoutpansberg Division figures prominently, especially its 

 extreme northern portion coming within the tropic of Capricorn. 

 The Bechuanaland plants were collected by Mr. C. C Harbor, and 

 some of those from tropical Transvaal by Dr. C. E. Moss when with 

 Archdeacon Rogers : for the rest we have t6 thank the Archdeacon 

 himself. 



Thanks are hereby rendered to Mr. J. R. Drummond for kindly 

 determining the Orewia and to Mr. J. Hutchinson for the description 

 of a new Phyllanthus — a genus with which he is well acquainted as 

 the result of careful study. The sequence observed, it may be 

 mentioned, is that of the Flora of Tropical Africa, 



Grewia rhytidophylla K. Schum. 



Zoutpansberg Div., Messina (tropical) ; Moss Sf Rogers 17, 101. 



Two good specimens of this little-known species ; the type is from 

 East Africa. Burret, the latest monographer of the genus, has 

 reduced it to G.fallax K. Schum., but Mr. Drummond does not 

 share this view. 



Vepris zambesiaca, sp. no v. Hamis rigidis subteretibus striatis 

 i*amulos breves fertiles foliatos pubescentes hac atque iliac emittenti- 

 bus ; foliis alternis petiolatis (petiolo anguste alato) trifoliolatis 

 griseo-pubescentibus foliolis sessilibus oblongo-ovatis vel oblongo- 

 lanceolatis obtusis nonnunquam emarginatis ima basi cuneatim angus- 

 tatis membranaceis ; paniculis satis laxis foliola circiter a^quantibus 

 pubescentibus ; forihus 4-meris pedicellatis ; calyce cupulari denti- 

 culato pubescente ; petalis ovato-oblongis obtusis glabris ; staminihits 

 (anne semper?) 7 antheris ovato-oblongis obtusis apice ipso obscure 

 mucronulatis quam filamenta paullulum longioribus ; ovarii rudimento 

 bene evoluto ; forihus $ ignotis. 



Rhodesia, Livingstone, N. bank of Zambesi ; No. 7486. 



* Types of the species here described are in the National Herbarium. 



