THE PALMS OF BRITISH INDIA AND CEYLON. 673 



Labill., Loxococcus, Wendl. & Dr., Adinorhytis, Wendl. & Dr, 

 Rhopalohlaste, SchefF., Ftijcliorwphis, Becc, Dictyosperma, Wendl. 

 & Dr., Archontophcenix, Wendl. & Dr., Nenya, Wendl. & Dr., 

 OyphopJicenix, Wendl. & Hook., Misclioplilceus, Sclieff., Pinanga, 

 Bl., Areca, L. 



Key to the genera described below f : — 



A. Arecece anomalce. — Spadix between or below the leaves 

 branching, with two spathes of which at least the upper one is 

 complete. Female flowers with valvate corolla. Ovary unilocular 

 or sometimes with 2-8 ovnles. Leaves unarmed, smooth. 



Male calyx of rounded imbricate sepals. 



Female corolla valvate throiighout Oreodoxa. 



B. Areceace iguatmrece. — Spadix simple with a stout rhachis 

 developed between the short-sheathed leaves. Spathes 1-3. The 

 clusters of 3 flowers in open, flat, or lipped cavities of the rhachis, 

 Male flowers with an imbricate calyx. Female flowers with a 

 broadly imbricate corolla. Leaves unarmed : 



Seed not erect, albumen not equable ... Galyptrocalyx. 



Seed erect, albumen equable Hotvea. 



G. Arecece heteros'pathoe . — Spadix branched, between the leaves. 

 Spathes 2, pierced by the spadix, or upper spathe opening com- 

 pletely on the ventral side. Male flowers with an imbricate calyx. 

 Female flowers with a broadly imbricate corolla. Ovary with 1 

 ovule. Leaves unarmed. 



Pericarp smooth, albumen slightly ruminate Heterosphatlia. 

 D. Arecece aculeiferce. — Spadix once or twice branched, between 

 or below the leaves. Spathes 2 or several, complete. Male 

 flowers with an imbricate calyx. Female flowers with an imbricate 

 corolla. Ovary with 1 ovule, united laterally with the wall. Leaves 

 with long spines : — 



(a) Spadix between the short-sheathed leaves. Albumen 

 ruminate : 

 * Leaves irregularly pinnatisect : 



1 . Spadix twice branched. 



Stamens 6 . . . , Roscheria. 



2. Spadix once branched. 



Stamens co Neplirosperma, 



** Leaves bifid with pinnately dentate margin : 



1 . . Stamens 6 Verschaffeltia. 



2. Stamens 15-20 Phcenicop>hormm^ 



(6) Spadix below the long-sheathed leaves : 



1 . Albumen equable Acantliophcenix. 



2. Albumen ruminate Oncosperma. 



t We follow in the main Drude. Palmae, 65. 



