594 CLXI. GR AMINES. 



Conspectus of the Genera, 



< with awns. . § 1 



( in panicles, \ without awns. § 2 



I Uvith awns. . §3 



fl-fruited, . . ( in spikes, ^ without awns. §4 



I \ with awns. . § 5 



\ \ in panicles, ( without awns. § 6 



Spikelets Is— 00-fruited, (in spikes §7 



^ Fr. white. Oryzopsis. 4 



( sessile, l Fr. hl3Lck.Piptatheru7n. 3 



f cartilaginous, I stipitate. Fr. black Stipa. 2 



{ naked. Stam. 1. Cinna. 10 



herbaceous, I hiiiry. Stana. 3. Calamagrostis. 13 



membranaceous, 1-keeled. . Agrostis. 5 



S Paiete 2, ^ the lower with 3 awns, often twisted. . . Aristida. 1 



(Glumes \ l-flowered. [ Pulea- 3, upper one with an awn. Flowers polygamous. Sorghum. 57 



large, >2-flowered (one tlower abortive), longer than the paleae. . . . Holcm. 25 



^unequal, one of them hardly perceptible Muhlenbergia. 9 



Glumesminute, ^subequal,oneol'themawned Tnchochloa. U 



. . Glumes 0. Aquatic grasses C Fr. coated &aX. 5 



<t Stig. 2. ( Fr. naked. Sporobohis. G 



< membran'ous. { Stigmas 3. . . Psanima. 12 



^Palea:- 2, ^coriaceous Milium. 19 



< Glumes 2. { PaleiE 1. Panicle mostly capillar}-. . . Trichodium. 8 



rSpikelets l-flowered. ^Glumes 0. Leaves retrorsely scabrous. . . , Leersia. 5S 



I \ Glumes 2, very unequal, resembhng the outer abortive paleae. Famcum. ^i 



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



6 2 lspikeleta3-flowered, 2 ofthe flowers staminate, the other perfect. . ,. . Hierochloa. .6 



^ ^ <,Pal.withawnsl— 3timestheirlength.X?opec?/ra5. 11 



( Involucre 0. I Palea; with awns 5 times their length. Hord^wm. 53 



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



( subsimple. ( Spikelets with a burr-like involucre. . . . Cenchrus. 2.3 



\ \ Both glumes and palei? awned. . . Pohjpogon. t 



(Spikesolitary.f paniculate or lobed. ^Glumes awnless, palea? avvned. . . Anthoxanthuvi. ^ 



^ Spikes 00, not bearded, unilateral, panicled. Paleae cartilasrmous. . . . Oplis.nenm. 2o 



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



^ ^ '^ '^ "= ( sohtarj', termuial. . . . Phlciim. 16 



' Spikes cylindrical, [ several, terminal and lateral. Cnjpsis. 15 



f 1—00; spikelets suborbicular. Paspa/um. 17 



j digitate or verticillate. linear. Digitaria. 18 



I pedunculate in a 2-sided panicle. Sparn'na. 49 



fFls rtprfpct or Dolveamous. L Spikes unilateral, [sessile in a unilateral panicle. Lepturus. 60 



iris, pcic V iB uUterminal, sterile above, fertile at base. . . Tripsacum. 61 



§ 4. ( Spikes monacious, . . I fertile ones lateral, sterile ones terminal, panicled. Zea. 6-2 



" ^ *^ ( Apex bifid. Awn bent. . Avena. 30 



fnear the base. (Apex multifid. . . . Aira. 28 



j ( which has two bristly teeth. Trisetum. 29 



1 < which is merely bifid. . Bromu-s. 34 



r Lower paJea awned on the back L near the apex (which is entire. . . • Gymnopogon. 43 



( which is entire. Fruit coated. . . . Festuca. cS 



< < with a cusp each side of it Uralepis. 32 



§ 5. I Lower palea awned at the apex ( between the two teeth : awn twisted. . Danthoma. 31 



f Paleae entire, not mucronate, bristly at base. . . Arundo. c.3 



Palea; bidentate, outer one mucronate. . . . Ceratochloa. 35 



I Palea; entire, outer one mucronate Fe-stitca. 36 



1 Palea* cartilasinous, outer cuspidate, coating rruit. Diarrhena. 37 



Outer palea bifid and tricuspidate Tricuspis. 39 



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



Palea; not mucronate, inner one bifid. . . . Poa. 41 



_ Outerpaleatruncatc-mucronate, inner bifid. . . Unioia. 43 



J perfect. ..( Spikelets cordate at base, tumi<l. pendulous. ... Bnza. 42 



, perieci. . v p Panicle contracted. . . . Koelena. 33 



5 6 L Terminal flower abortive or a mere pedicel. (Panicle large, diftuse. . . Melica. 44 



sc. k.iefuii oi lone (inthetopspikelet2). . . . Lolium. .54 



Glumes broad, . . ( two in each spikelet Triticiim. 51 



\ collateral : spikelets in 2s, &c. . . Elymus. 55 



r Spikes 2-ranked, (Glumes subulate, (opposite: spikelets solitar}'. . . . Seca!e. 52 



I ^ ( Spikelets in two rows. . . Eleimm. 46 



( digitate (rarely solitary). ( Spikelets in one row. . . . Cynodon. " 47 



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



.Spikes unilateral, (conglomerate or paniculate Dactyhs. 45 



FIG 56—1 Agrostis alba ; a l-flowered spikelet ; a, the two glumes. 2. Aflower, with the two palese, 

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

 showingTs 2 hypoirynous scales, three stamens and ovarj- with the two stignias. 4. Phleum pra ense ; 

 a 1 flowe ed spikelet; a. glumes ; b. truncate palea;; &c. 5. Polypoeon ; a l-flowered sp.kclet ; glumes 

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



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

 twopdes &" 8 Festuca duriuscula: a 5-flowered spikelet : a, two glumes; 6, a single flower. 9. The 

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



