LIV. CYPBEACE^. 879 



Tribe III. ETPOLTTBEJEl. 



Spikelets l-flowered, agglomerated in capitate heads or cymose panicles. 

 Mowers g , each with 2-4-6 closely imbricate glumes. Perianth 0. Stamens 2-3, 

 or 6-8. Style 2-3-fid, deciduous, or the base persistent. 



PEINCIPAL GENERA. 

 Hypolytrnm. Lipocarpha. Hemicarpha. Diplasia. 



Teibe IV. BHYNGHOSPOBEuMI. 



Spikelets usually few-flowered [flower solitary and axillary in Oreoholus]. 

 Glumes imbricate in 2 or several rows, the lower empty. Flowers usually poly- 

 gamous. Perianth 0, or composed of 6 bristles, rarely less, very rarely more (8-10) 

 [or of 6 2-seriate pieces in Oreoiolus], Stamens 3, sometimes 6. Achene often 

 beaked by the persistent base of the style. 



PEINCIPAL GENERA. 



Arthrostylis. Caustia. Blysmus. Pleurostachys. 



Lepidosperma. Dulichium. Rhyncospora. Carpha. 



Schoenua. Cladium. Ohsetospora. Oreobolus, 



Teibe V. 8GLEEIEJE. 



Spikelets diclinous, the $ many-flowered, with glumes imbricate in 2 or several 

 rows, the lower ones sometimes empty. Perianth 0. Stamens 1-3, very rarely 5. 

 9 spikelets l-flowered, with glumes imbricate in several rows. Perianth 0. Style 

 3-fid, equal at the base. Achene bony or crustaceous, usually seated on a 3-lobed 



disk. 



PRINCIPAL GENERA. 



Scleria. Diplacrum. 



Tribe VI. GABIGINE^. 



Flowers monoecious or dioecious, in spikes, with glumes imbricate in several 

 rows. Perianth 0. ^ spikes simple. Stamens 3-2. $ spikes simple or compound. 

 Pistil embraced by an inner scale with its back to the axis, 2-keeled (analogous to 

 the upper glumelle of Graminece), with edges usually joined and thus forming an 

 envelope or utricle {ureeole, perianth, perigynium), persistent and accrescent, and 

 enclosing either the ovary only, or the ovary accompanied by a sterile setiform 

 pedicel. 



' PRINCIPAL GENERA. 

 Carex. Elyna. 



Cyperacece are cloaely allied to Graminece ; the latter being' distinguished by their split leaf-sheath, 

 rounded culm with projecting nodes, dorsiflxed anthers, usually plumose stigmas, fruit with pericarp 

 adhering to "the testa, and always extruded embryo. The habit of Cyperacea is that of Restiacece, but the_ 



