GRAMINK^. 535 



i)lvisiON IV. OMYZEM—SpUelets of AgrostideK, hut sterile glumes more than 2, 

 often partly or all abortive, and palea furnished with a midrib. — Spikelets jointed at the 

 base, decidaous. 



17. OEYZA, L. 



Spikelets laterally flat-compressed ; 3 sterile glumes developed, small, 2 abortive, fertile 

 chartaceous, usually awued. Stamens 6. — Spikelets" paBJca/aie. 



35. O. latifolia, Desv. Stout ; leaves lanoeolate-aeuminate, scabrous ; ligule short ; 

 panicle spreading : inferior branches whorled ; fertile glume hispid, awned. — Kth. Rev. 

 t.4i. — 0. saliva, L., has narrower leaves, a produced ligule, the panicle more contracted, and 

 the down of the flower soft. — Hab. Trinidad !, Cr., at Caroni : [Southern United States to 

 BrazU]. 



18. LEBRSIA, Sw. 



Character of Orysa, but all sterile glumes abortive, and flowers awnless, 6-l-audrou9. 



36. Ii. hexandra, Sto. Panicle spreading : flowers elliptical-oblong, 6-androus, hispid ' 

 along the keel of the glume.^ — Kth. Rev. t. 1. — L. mexicana, Kth., australis, R. Br. mauri- 

 tauica, Salzm. .', contracta, Ns. — Leaves variable in breadth. — Hab. Jamaica (Su).) in 

 ditches; Dominica!, Imr. ; Trinidad!, C>"., in savannahs; [Florida! to Buenos Ayres!, 

 Algeria ! to the Cape !, East Indies !, to Australia]. 



37- !■. monandra, Sw. I Panicle narrow, at length spreading, somewhat one-sided : ''t 

 branches distant : flowers semiovate-roundish, pointed, 1-androus, glabrous along the keel of c 

 the glume. — Spikelets pale, often imbricated, j'" long. — Hab. Jamaica !, Sw., in calcareous 

 Vvoods; [Cuba ! ; Texas !, Mexico]. 



19. LUZIOLA, Juss. 



Spi.ielets monoecious in distinct panicles : terminal panicle g , axillary ? . All sterile 

 glumes abortive, fertile membranaceous, awnless. Stamens 6-11. " Mmhryo large." — 

 Ligule produced. f 



|X 38. Ii. peruviana, Juss. Meg. Esseq. t. 2. Stem creeping at the base or floating ; S 

 flowers 2'", ? 1'" long.— Hab. Ti-inidad !, iocH. ; [Mexico to Brazil !]. 



DlTfsiON V. TSALAWLDHM. — Spikelets \-flowered or unisexual \-few-flowered. 

 Stigmas projecting from the summit of the flower. 



20. OLYRA, i. 



Spikelets 1-flowered, monoecious, 3 devoid of sterile glumes ; ? flower cartilaginous : its 

 2 sterile glumes herbaceous, often tailed at the summit. " Caryopsis free : embryo miuute." 

 — Leaves usually broad, often oblique at the hose; spikelets pedicellate, jointed at the 

 base : $ flower included within the sterile glumes. 



* Spikelets paniculate, inferior 3 . 

 y/ 39. O. latifolia, Z.. Stout, branched below: uodes contracted; leaves ovate-oblong, 

 ovate-lanceolate (or lanceolate), acuminate ; panicle spreading : all brandies terminated by a . 

 single ? spikelet, most 3 below it ; spikelets glabrous ; 3 glume tailed with a bristle, ? > 

 sterile glumes subulate-tailed : tail of the inferior longer : flower ellipsoidal, glabrous, 

 shining-poHshed.— S/. t. 64. /. 2. Trin. tc. t. 346.— O. paniculata, Smj.— 4'-15' high, 

 variable in the ? flower being ebony-white or more rarely black. 



o. Leaf-sheaths more or less hairy : ligule short, cUiate. 



/8. arundimacea, Tr. Leaf-sheaths glabrous or glabrescent : ligule produced, glabrous. 



Hab. Jamaica 1, all coll. (o, gl), common in woods ; Antigua !, Wullschl. {P), Dominica !, 

 linr. iP) ; Trinidad !, Cr. {P) ; [Cuba! and Mexico I to Brazil!]. 



40. O. semiovata, Tr. Erect, flexuose at the base : inferior nodes prominulous and 



