594 



CLXI. GRAMINE-E, 

 ConspectiiS of the Genera, 



fl-fruited, . . (i 



SI. 



<, with awns. . 5 1 



in panicles, i without awns. §2 



i with awns. . §3 



in spikes, i without awns. § 4 



? with awns. . | 5 



in paniclesj i without awns. § 6 



Spikelets 12— OO-fruited, {in spikes §7 



<Fr. white. Oryzopsis. 4 



\ sessile. I Fr. black. Piptalfierum. 3 



ICcartilaginous, Jstipitate. Fr.black Sripa. 2 



I C naked. Stam. 1. Cinna. 10 



) herbaceous, ( hairy. Stam. 3. Calamagrostis. 13 



$ with lawn, L membranaceous, Ikeeled. . Agroslis. 5 



< PaleiB 2, { the lower with 3 awns, often twisted. . . Aristida. r, 1 



Glumes ( l-flowered. { Palese 3, upper one with an awn. Flowers polygamous. Sorghum. 57 



large, (2-flowered (one Hower abortive), longer than the pales. . . . Holcus. 25 



i unequal, one of them hardly perceptible Muhlenhergia. 9 



Glumes minute, <subequal, one of them awned Tricliodiloa. U 



Glumes 0. Aquatic grasses Zizania. 59 



S Fr. coated. Agrostis. 5 



< Stig. 2. 1 Fr. naked. Sporoboliia. 6 



J membran'ous. t Stigmas 3. . . Psarmna. 12 



< Paleae 2, i coriaceous Miliwm. 19 



< Glumes 2. ( Paleae 1. Panicle mostly capillary. . . Trichodium. 8 



rSpikeletsl-fiowered. (Glumes 0. Leaves retrorsely scabrous Leersia. 58 



J 5Glumes2, very unequal, resembling the outer abortive paleae. Pam'Mwn. 21 



1 Spikelets 2-flowered. { Glumes 2, equal, longer than the palcEB. . . . Phalaris. 24 



LSpikelets 3-flowered, 2 of the flowers staminate, the other perfect. . . . Hierochloa. 26 



4 Pal. with awns 1 — 3 times their length. Alopecurus. 14 



f Involucre 0. < Paleie with awns 5 times their length. HordeMira. 53 



< Spikelets with an involucre of 2 or more bristles. Setaria. 22 



I subsimple. ( Spikelets with a burrlike involucre. . . . Cenchrus. 23 



< S Both glumes and paleae awned. . . Polypogan. 7 



( Spike solitary, ( paniculate or lobed. ; Glumes awnless, paleae awned. . . Anthoxanthv/m. VI 



< Spikes 00, not bearded, unilateral, panicled. Palese cartilaginous. . . . Oplis'mRnus. 20 

 ( Spikes 2 — 00, polygamous. Sterile flowers plumosely bearded. . . . Andropogon. 56 



I solitary, terminal. . . , Phleum. 16 



fSpikes cylindrical, ( severaJ, terminal and lateral. Crypsis. 15 



I (\ — 00 ; spikelets suborbicular. Paspatum. 17 



< ! digitate or verticillate, linear. Digilaria. 18 



I 1 pedunculate in a 2-sided panicle. Spor;?'na. 49 

 ( Fls. perfect or polygamous. L Spikes unilateral, L sessile in a unilateral panicle. Lepturus. 



< < all terminal, sterde above, fertile at base. 

 ( Spikes moncEcious, . . (fertile ones lateral, sterile ones terminal, panicled. 



5 Apex bifid. Awn bent, 

 ("near the base. ( Apex multifid. 

 J ( which has two bristly teeth. 



1 < which is merely bifid. 



fLower pa]ea awned onthe back Lnearthe apex ( which is entire. . 

 J ( which is entire. Fruit coated. 



J <. with a cusp each side of it 



ILower palea awned at the apex ' between the two teeth : awn twisted. 

 fPalea; entire, not mucronate, bristly at base. . 

 Paleae bidentate, outer one mucronate. . 



PalecE entire, outer one mucronate 



PalezB cartilaginous, outer cuspidate, coating imit. 



Outer palea bifid and tricuspidate Tricuspis. 



Outer palea erose-denticulate. Spikelets terete. . Glyceria. 40 



( Spikelets Paleae not mucronate, inner one bifid. . . . Poa. 41 



CTerminalfl.< notcordate. LOuter palea truncate-mucronate, inner bifid. . . Uniola. 43 



) perfect. . . ( Spikelets cordate at base, tumid, pendulous. .... Briza. 42 



) S Panicle contracted. . . . Koeleria. 38 



LTenninalflower abortive or a mere pedicel. ( Panicle large, diffuse. . . Melica. 44 



ft one (in the top spikelet 2). . . . Loliimi. 54 



f Glumes broad, . . ( two in each spikelet Triticum. 51 



< ( collateral : spikelets in 2s, &c. . . Elymtia. 55 



Spikes 2-ranked, ( Glumes subulate, I opposite : spikelets solitary. . . . Secale. 52 



J Spikelets in two rows. . . Elevsine. 48 



(digitate (rarely solitarj'). ? Spikelets in one row. . . . Cynodon. 47 



< remote, short, forming a long, slender raceme. . . . Atheropogon. 50 



Spikes unilateral, ( conglomerate or paniculate Dactylis. 45 



FIG. 56.— 1. Agrostis alba ; a l-flowered spikelet ; a, the two glumes. 2. A flower, with the two paleae, 

 three stamens and two plumose stigmas. 3. Leersia oryzoides ; a flower removed from its glumes, 

 showing its 2 hypogynous scales, three stamens and ovary with the two stigmas. 4. Phleum pratense ; 

 a l-flowered spikelet; a, glumes -, 6, truncate palea; ; (&c. 5. Polypogon ; i^-flowered spikelet ; glumes 

 and lower palea awned. 6. Holcus lanatus; a two-flowered spikelet; a, glumes; b, the two flowers 

 (upper staminate). 7. Poa pratensis ; a 4-flowered spikelet ; a, the two glumes ; J, a single flower, with 

 two paleiB, &c. 8. Festuca duriuscula ; a 5-flowered spikelet : a, two glumes; *, a single flower. 9. The 

 caryopsis of Hordeum, showing the embryo at Xhe base of the copious albumen. 



S3. 



S4. 



S5 



Tripsacum. 



Zea. 



Avena. 



Aira. 



Trisetum. 



Bromns. 



Gymnopogon. 



Festuca. 



Uralepis. 



Danthonia. 



Arundo. 



Ceratochloa. 



Pestuca. 



Dmrrhena. 



S6. 



