562 



GENUS III. POTAMOCHLOA. 

 Bexandria Dig'ynia. Sex: Syst: 



Deri/v. From Potamos a river and Chloa grass. 



Gen. Cttau. Spikelets hermaphrodite, 1 -flowered : glumes (or 

 palese) 2, sessile, continuous to the apex of the pedicel, scarcely 

 compressed ; lower one larger, 5-nerved, terminating in a straight 

 awn, nerves denticiilate-cUiate, upper muticous, acuminate, 3-nerved, 

 keel denticulate-scahrous : scalelets 2, large, fleshy, glabrous or 

 ciliated at the apex : stamens 6 : filaments long-exserted : ovaiy 

 sessile : styles two, stigmas plumose. 



(1) P. AEiSTAiA. f Griffith.; 



Idmt. Griffith 1. o. t. 24, fig. 2. 



Syn. Leersia aristata, Eoxb. I. c.^— Pharus aristatus, Itet%. — 

 Hygroryza aristata, Nees. — Zizama, aristata,. -ffww^A. 



Bngrm. Eheede Mai. x. t. 12. 



Spec. Ceab. Densely csespitose, floating : submersed culms very 

 long, here and there capillaceous rooting, emersed culms glabrous : 

 sheaths submersed and half emersed, very callous, thickened, some- 

 what inflated, emersed ones longer, cyHndrio : leaves lanceolate, 

 cordate at the base, obtuse, somewhat hooded at the apex, stiff, 

 scabrous : panicle erect, lowest branches sub-verticelled, spikelets 

 somewhat secund, lower ones twin, unequally pedicelled, upper ones 

 solitary on longer club-shaped pedicels, marked with a red ring. 



Floating on deep standing waters near Calcutta. Jumalpoor, 

 Eastern Bengal. Flowering in the cold season. Malabar. 

 Peninsula. 



SECT. II. PHAIiARIDS:^. 



Spikelets hermaphrodite, polygamous seldom monoecious, some- 

 times 1-flowered, vsdth or without the stipitiform rudiment of another 

 upper flower, sometimes 2-flowered, either flower hermaphrodite or 

 male, sometimes 2 — 3-flowered, terminal flower fertile, rest incom- 

 plete : glumes usually equal : palese often shining, hardened in 

 fruit : styles or stigmas elongated into many. 



GENUS IV. COIX. 



monoeda. Tviandrla. Sex-. Sysu 



Gen. Chab. Flowers monoecious : males loosely spiked, issuing 

 from a common ovate, inflated, thickly coriaceous, at length bony 

 involucre, apex pervious: glumes 2, membranaceous, muticous, 

 upper one 2-keeled : scalelets 2, glabrous : stamens 3 : female 



