GRAMINE^. 531 



Stamens 2. Caryopsis laterally compressed, free. — Herbaceous, stoloniferous grasses; leaves 

 broad, petioled : ligular border ciliate ; panicle fastigiate : branches long, filiform, often 

 half-whorled ; spikelets long-pedicellate, jointed at the base, elliptical-oblong. 



13. O. laxa, P. B. Leaves oblong-lanceolate, acuminate, glabrescent : petiole and sheath 

 pubesceut ; panicle expanded in fruit ; glumes lanceolate-acuminate, sterile shorter, unequal. 

 — Kth. Rev. t. 71.— Stem 2'-3' high, leaves 6"-3" long, 12"'-8'" broad : petiole 6"'-12"' 

 long ; panicle 6"-12" long ; spikelets at the extremity of the branches, greenish, 3'" long, 

 often 1-flowered with a stipitate superior rudimeut. — Hab. Triuida ; !, Cr., in woods, Fort 

 George; [Mexico! to Brazil!]. 



10. UNIOLA, L. 



Spikelets flat-compressed, 2-many-flowered : glumes herbaceous, keeled, 3-6 sterile. 

 Palea compressed, 2-keeled : nerves distant. Caryopsis laterally compressed, free. — Herba- 

 ceous, stoloniferous grasses ; ligule ciliate ; spikelets paniculate. 



Sect. 1. Chasmanthus, Lk. — Spikelets small, ovate; keels of the palea wingless. — 

 Panicle virgate, somewhat contracted. 



14. JJ. virg-ata, Gr. Rigid, stout ; leaves convolute-filiform, flexuose, devoid of asperi- 

 ties; panicle erect, lang-virgate : axis sulcate, pubescent : branches short, densely approxi- 

 mate, uppermost reduced ; spikelets shortly pedicellate,, 1-sided, 2-fiowered ; glumes 3- 

 uerved, shortly mucronate or bluntish, puberulous or glabrate, 6-4 sterile, ovate-oblong, 2 

 lowest shorter. — SI. t. 72. f. 1 : bad. — Poa, Poir. — Habit of Eragrostis cynosuroides. 

 Stem 4' high, 1'" thick, smooth, glabrous; leaves often l'-l^' long, rosular at its base (and 

 at the inferior distant nodes) ; panicle 20"-5", its simple branches usually 1", spikelets 1'" 

 long, the latter straw-coloured, jointed at the base : sterile glumes placed right aud left 

 against the axis; stamens 3. — 'Hab. Jamaica!, March; [Cuba!, along the sandy seashore; 

 Haiti]. 



Sect. 2. Euuniola. — Spikelets large, smooth, ovate-oblong ; keels of the palea Kinged, 

 replicate. — Panicle spreading. 



15. 17. paniculata, L. Stout, rigid ; leaves involute at the scabrous margin ; panicle 

 dense: axis sulcate, i>ubescent ; spikelets shortly pedicel/ate, dislichous-1-sided, 8-16- 



jlowered ; glumes ovate-oblong, pointed, scabrous at the keel and margin, 4-6 sterile, fer- 

 tile 3-androus: 3 nerves stronger. — Catesb. Carol. 1. t. 32. — 4—8' high; leaves 2'-l' long, 

 4"'-6"' broad ; spikelets 5"'-8"' long, straw-coloured.— Hab. Bahamas !, Swains., on the 

 sandy seashore ; [Southern United States ! ; Mexico ! to Ecuador !]. 



11*. BROMUS, L. 



Spikelets many-flowered : glumes herbaceous, 2 sterile, fertile mostly awned below the 

 summit. Stigmas inserted below the hairy summit of the ovary. Caryopsis adhering to 

 the palea. — Spikelets usually large, paniculate. 



Sect. Schedonorus, Pr. — Fertile glumes keeled, %-dentate, sterile l-S-nerved. Stigmas 

 included, or projecting above the middle of the flower. 



16*. B. sterilis, L. Annual ; 9tem glabrous ; leaves flat-linear, pubescent : ligule 

 produced ; panicle spreading or nodding : inferior branches half-whorled ; spikelets linear- 

 lanceolate : fertile glumes 7-nerved, shorter than (or as long as) the straight awn, the latter 

 inserted below its 2-partite summit; palea ciliate. — Reichenb. Ic. Germ. f. 1583. — Hab. 

 Naturalized in Jamaica !, Wils., in the mountains of S. Andrews, at 4000' alt. ; [Europe!]. 



12. ERAGROSTIS, P. B. 



Spikelets many (-2) -flowered, laterally compressed, oUong or linear : 2 glumes sterile, 

 fertile ones keeled, 3-nerved, awnless, deciduous : rhachis glabrous. Palea persistent on 

 the rhachis or deciduous with its joints. Stigmas projecting near the base of the flower. 

 Caryopsis free, devoid of a furrow. — Ligular harder, mostly ciliate ; spikelets paniculate. 



