&94 



CLXI. GRAMINEiE. 



Conspectus of the Genera, 



f l-fruited, . . 

 Spikelets I2— oo-fruited, 



^ with awns. . § 1 



in panicles, I without awns. § 2 



I with awns. . | 3 



in spikes, ? without awns. § 4 



\ with awns. . § 5 



i in panicles, ( without awns. § 6 



I in spikes § 7 



\ Ft. white. Oryzopsis. 

 \ sessile, i Ft. hlaLck.Piplatherum. 



{cartilaginous, {stipitate. FT.hlaick-Stipa. 

 t naked. Stam. 1. Cinna. 

 herbaceous, ( hairy. Stam. 3. Calamagrostis. 

 membranaceous, l-keeled. . Agrostis. 

 C Palece 2, Uhe lower with 3 awns, often twisted. . . Aristida. 

 C Glumes \ 1-flowered. \ Paleae 3, upper one with an awn. Flowers polygamous. Sorghum. 

 1 large, ?2-flowered (one flower aoortive), longer than the paleae. . . . Holcus. 



i ^ unequal, one of them hardly perceptible Muhlenbergia. 



1 Glumes minute, {subequaJ, one of them awned TricJwchloii. 



§ 1, L Gliunes 0. Aquatic grasses Zizania. 



\ Ft. coated. Agrostis. 

 < Stig. 2. I Ft. naked. Sporobolvs. 

 < membran'ous. X Stigmas 3. . . Psamma. 



< PaleaB 2, 1 coriaceous Milium. 



t Glumes 2. ^ Paleae 1. Panicle mostly capillary. . . Trichodium. 



f Spikelets Irflowered. ^Glumes 0. Leaves retrorsely scabrous Leersia. 



1 4 Glumes 2, very unequal, resembling the outer abortive paleae. Panicum. 



I Spikelets 2-flowered. I Glumes 2, equal, longer than the paleae. . . . Phalaris. 

 I 2. I Spikelets 3-flowered, 2 of the flowers staminate, the other perfect. . . . Hierochloa. 



t Pal. with awns 1—3 times their length. Alopecurus. 

 Involucre 0. ( Paleae with awns 5 times their length.HordeMTw. 

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

 ( subsimple. ( Spikelets with a burr-like involucre. . . . Cenchrus. 

 I t Both glumes and paleee awned. . . Polypogo7i. 



C Spike solitary, ( paniculate or lobed. I Glumes awnless, paleae awned. . . Anthoxanthum. 

 < Spikes 00, not bearded, unilateral, panicled. Paleas cartilaginous. . . . Oplismenus. 

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



< solitary, terminal. . . . Phleum. 

 ' Spikes cylindrical, I several, terminal and lateral. Crypsis. 



ri— 00; spikelets suborbicular. Paspalum. 



I digitate or verticillate, linear. Digitaria. 



1 pedunculate in a 2-sided panicle. Spartina. 



L Spikes imilateral, L sessile in a unilateral panicle. Lepturus. 



^ all terminal, sterile above, fertile at base. . . Ti-ipsacum. 



< fertile ones lateral, sterile ones terminal, panicled. Zea. 



Avena. 



Aim. 



Trisetum. 



Brcmius. 



Gymnopogon. 



Festuca. 



Uralepis. 



Danthonia. 



Arundo. 



Ceratochloa. 



Festuca. 



Diai-rMna. 



i Fls. perfect or polygamous. 

 § 4. ( Spikes monoecious, 



\ Apex bifid. Awn bent, 

 ("near the base. ( Apex multifid. 

 ' < which has two bristly teeth. 



which is merely bifid, 

 f Lower palea awned on the back Lnear the apex ( which is entire. . 

 J ( which is entire. Fruit coated. 



\ I with a cusp each side of it. . 



§ 5. 1 Lower palea awned at the apex ( between the two teeth : awn twisted. 

 'Paleae entire, not mucronate, bristly at base. . 

 Paleae bidentate, outer one mucronate. . 

 PaletB entire, outer one mucronate. . 

 Palea? cartilaginous, outer cuspidate, coating rruit. 



Outer palea bifid and tricuspidate Tricuspis. 



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



r Terminal fl 

 J perfect. . . 



( Spikelets 

 < not cordate. 



40 

 41 

 43 

 42 



44 

 54 

 51 

 55 

 52 

 46 

 47 

 50 

 45 



FIG. 56.— 1. Agrostis alba ; a 1-flowered .=ipikelet ; 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 1-flowered spikelet; c, glumes ; &, truncate pales ; (fee. 5. Polypogon; a 1-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 ; 6, a single flower, with 

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

 caryopsis ofHordeum, showing the embryo at the base of the copious albumen. 



Paleae not mucronate, inner one bifid. . . . Poa. 



.Outerpaleatruncate-mucronate, inner bifid. . . Uniola. 



( Spikelets cordate at base, tumiil, pendulous. .... Briza. 



\ Panicle contracted. . . . Koeleria. 



§6. I Terminal flower abortive or a mere pedicel. (Panicle large, diff'use. . . Melica. 



J one (in the top spikelet 2). . . . Lolium. 



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



< 5 collateral : spikelets in 2s, &c. . . Elymus. 

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



< Spikelets in two rows. . . Eleusine. 



{ i digitate (rarely aolitarj*). \ Spikelets in one row. . . . Cynodon. 



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



\ renioie, .snori, 

 § 7. I Spikes unilateral, ( conglomerate 



or paniculate Dactylis. 



