46 Materials for a Flora of the Malayan Peninsula. 



III. — Materials fm- a Flora of the Malayan Peninsula, — By Sir Geokge 

 King, K.C.I.E., M.B., LL.D,, F.R.S., &c., late Superintendent of the 

 Royal Botanic Garden^ Calcutta. 



No. 13. 



The present contribnfcion carries these Materials to the end of the 

 GalyciUorse. The orders included in it are Datiscacese, Droseraceas, 

 Passifloracese, Begoniaceds, Ficotdese, Tlmhelliferse, and Cornacese. It has 

 not been possible for me to prepare my account of the Calycifloral orders 

 in the exact sequence followed in Hooker's Flora of British India ; each 

 order, however, bears the ordinal number given to it in that work. The 

 species described in the present paper are 47 in number, and of these 

 fourteen belonging to the genus Begonia, and two belonging to Mastixia, 

 are new to science. I hope in future contributions to take up the 

 orders belonging to the groups Corollifiorse and Incompletae. 



Order LXVII. DATISCACE^. 



Trees or herbs. Leaves petioled, simple or pinnate ; stipules 0. 

 Flowers small, dioecious in the Indian species, clustered, racemed or 

 panicled. Male : calyx-tube short, teeth 3-9 ; petals ; stamens 4-25. 

 Female : calyx-tube adnate to the ovary, lobes 3-8 short ; petals ; 

 ovary I-celled, open or closed at the vertex ; styles lateral, alternating 

 with as many parietal placentee, simple or 2-partite ; ovules very many, 

 ascending or horizontal. Capsule coriaceous or membranous, opening 

 at the vertex between the styles. Seeds very many, small, albuminous ^ 

 embryo straight, radicle next the hilum. — Distrib. Species 4 ; natives 

 of the Mediterranean, Central Asia, Java, and North-West America. 



Tetrameles, R. Br. 



A large tree. Leaves petioled, ovate, pubescent beneath at least on 

 the nerves. Flotvers dioecious, appearing before the leaves ; males 

 panicled, females in elongate racemes, clustered near the ends of the 

 branchlets. Male : calyx- lobes short ; teeth 4, ovate, one or two 

 smaller teeth sometimes added ; petals ; stamens 4, opposite the calyx- 

 teeth, inserted round a depressed disc ; rudiment of the ovary or 

 quadrangular. Female: calyx-tube ovoid; teeth 4 short; petals 0; 

 styles 4, short, stigmas simple somewhat club-shaped. Capsule ovoid, 

 with 4 lines or slight ridges, membranous, opening at the top between 

 the styles. Seeds very many, minute, flattened, ellipsoid, testa very lax 

 and extending much beyond the nucleus as a loose membrane, 



574 



