~ 
594 ‘ CLXI. GRAMINEZ. 
Conspectus of the Genera, 
: ; with awns. . § 
in panicles, {withoutawns. § 
: 3 , with awns. . § 
1-fruited, . . Cin spikes, without awns. § 
: r with awns. . § 
f : fin panicles, (without awns. § 
Spikelets (\2—00-fruited,?@inspikes. . . . . § 
i Fr. white. Oryzopsis. 4 
eieiD sessile. } Fr. black.Piptatherum. 3 
cartilaginous, me gad Fr. black. Stipa. 2 
naked. Stam. 1. Cinna. 10 
, herbaceous, igen Stam. 3. Calamagrostis. 13 
Dey lawn, \membranaceous, 1-keeled. . Agrostis. 5 
Phe 2, (the lower with 3 awns, often twisted. . Aristida. 1 
Glumes § 1-flowered. ¢ Palez 3, upper one with an awn. Flowers polygamous. Sorghum. 57 
large, 22-flowered (one flower abortive), longer than the palee. . . . Holcus. 25 
( unequal, one of them hardly percene A - « «. Muhienbergia. 9 
Glumes minute, (subequal,one ofthemawned.. . . . .« «© «© t 11 
§1, \Glumes0. Aquaticgrasses. . .. . «© « «© “© «© ,s «6 «, AteGnig. 59 
: ; Fr. coated. Agrostis. 5 
5 Ste. 2. (Fr. naked. Sporobolus. 6 
§membran’ous. @Stigmas3.. . Psamma. 12 
Palee2,?coriaceous. . . . . « Miliwm. 19 
Glumes2. ?Palew 1. Panicle mostly capillary. . . Trichodium. 8 
Spikelets 1-flowered. {Glumes 0. Leaves retrorsely scabrous... . . .. Leersia. 58 
Glumes 2, very unequal, resembling the outer abortive palee. Panicum. 21 
Spikelets 2-flowered. ? Glumes 2, equal, longer than the palez. 5. Pe aeneuarim 24 
§ 2. Spikelets 3-flowered, 2 of the flowers staminate, the other perfect. . _.  . Hierochioa. 26 
Pal. with awns 1—3 times their length. Alopecurus. 14 
Involucre 0. ? Palee with awns 5 times their length. Hordewm. 53 
Spikelets with an involucre of 2 or more bristles. taria. 22 
subsimple. ( Spikelets with a burr-like involucre. -  . Cenchrus. 23 
x ; x ; Both glumes and palee awned. . . Polypogon. 7 
Spike solitary, ( paniculate or lobed. ¢ Glumes awnless, palee awned. . . Anthoxzanthum. 27 
Spikes 00, not bearded, unilateral, panicled. Palew cartilaginous. . - «+ Oplismenus. 20 
§ 3. ( Spikes 2—09, polygamous. Sterile flowers plumosely bearded. - «+  « Andropogon. 56 
! ee: solitary, terminal. .. . _. Phleum. 16 
Spikes cylindrical, ? several, terminal and lateral. Crypsis. 15 
1—00; spikelets suborbicular. Paspalum. 17 
digitate or verticillate, linear. Digitaria. 18 
: , pedunculate in a 2-sided panicle. Spartina. 49 
Fls. perfect or polygamous. | Spikes unilateral, (sessile in a unilateral panicle. Lepturus. 60 
. all terminal, sterile above, fertileat base. . . Tvripsacum. 61 
§ 4.( Spikes monecious, . . ¢ fertile ones lateral, sterile ones terminal, panicled. hy 62 
Apex bifid. Awnbent. . Avena. 30 
{near the base. (Apex multifid. , =. . Aira. 28 
which has two bristly teeth. Trisetwm. 29 
} ; which is merely bifi - Bromus. - 84 
Lower palea awnec onthe back (near the apex ( which is entire. . . . Gymmnopogon. 48 
whichis entire. Fruitcoated. . . . Festuca. 36 
with a cusp each side ofit. . .. . . Uralepis. 32 
§ 5. \Lower palea awned at the apex ( between the two teeth: awn twisted. 
Palez entire, not mucronate, bristly at base. . 
Palee bidentate, outer one mucronate... 
Palew entire, outerone mucronate... . . | 
Palee cartilaginous, outer cuspidate, coating rruit. Diarrhena. 37 
oF 
Outer palea bifid and tricuspidate. . : 39 
: Outer palea erose-denticulate. Spikelets terete. . Glyceria. 40 
Spikelets | Palez not mucronate, inner one bifid. .  . . Poa. 41 
Terminal fl. ; not cordate. ( Outer palea truncate-mucronate, inner bifid. . . Uniola. 43 
perfect. . . ( Spikelets cordate at base, tumid, pendulous. E ‘ . Briza. 42 
3 ‘ Panicle contracted. . . .. Koeleria. 38 
§ 6. (Terminal flower abortive or a mere pedicel. ? Panicle large, diffuse. - « Melica. 44 
one (in the top spikelet2). .  . Lolium. 54 
Glumes broad,. . ¢@twoineachspikelet. .  . . . Triticum. 51 
collateral: spikelets in 2s,&c. . Elymus 55 
Spikes 2-ranked, ( Glumes subulate, ? opposite: spikelets solitary... . ~. Secale. 52 
ae . Spikelets in two rows. - «+ Eleusine, 46 
digitate (rarely solitary). ? Spikelets in one row. . - « Cynodon. 47 
remote, short, forming a long, slender raceme. - « Atheropogon. 50 
§ 7. \Spikes unilateral, (conglomevate or paniculate. . . . . . «. « Dactylis. 45 
FIG. 56.—1. Agrostis alba ; a 1-flowered spikelet; a, the two glumes 2. A flower, with the twopalee, 
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; a, glumes; 3, truncate palew; &c. 5. Polyparosy a 1-flowered spikelet ; glumes 
and lower palea awned. 6. Holcus Janatus; a two-flowered spikelet; a, glumes; b, the two flowers 
(upper staminate). 7. Poa pratensis; a 4-flowered spikelet ; a, the two glumes; 4, a single flower, with 
two palew, &c. 8. Festuca duriuscula; a 5-flowered spikelet: a, two glumes; b,asingleflower. 9. The 
caryopsis of Hordeum, showing the embryo at the base of the copious albumen. 
