334 



2. Ifacemcs disitato or paniilcd. all podii-ellate. Rhachis 

 joints and pedicels with a median longitudinal trans- 

 lucent line. Flowering glume pedicel-like, tapering 

 into an awn. (Subgenus AmpiiIi/jpiiis.) 



3. Spikes with many pairs of spikelets •. (4) .1. i)tlcrmc(liHS 



:?. Spikes one to three, rarely four pairs of spike- 

 lets, the rhachis and branches capillary (5) .1. mirnuilh us 



2. Racemes in panicles, frequently with few fertile spike- 

 lets. Rhachis joints without a translucent line. 

 Empty glume usually broadly lanceolate, finally in- 

 durated and shining ; second glume awnless ; third 

 glume hyaline, 2-nerved ; fourth entire or 2-fid, 

 awned, rarely unawned. (Subgenus Sokciuim.) 

 3. Very coarse erect grasses. 



4. Annual ; spikelets awned or awnless; 



cultivated only (7) .1. s<>r(jlnu)i 



4. Perennial ; spikelets awnless ((>) .1. halepcnsis 



3. Slender grasses. 



4. Awns 2.5 to 3 cm. long (9).l. hdilci/i 



4. Awns 1.5 cm. long or less, or wanting. 



5. Spikelets awnless (S)^4. ficrraliin iiiliilns 



5. Spikelets awned. 



6. Spikelets 4 to 5 mm. long, 

 brown, shining, clothed 



with brown hairs (S) .4. scrratiis (/cniiiiius 



G. Spikelets about 2 mm. long, 

 pale or green ; panicles 



very delicate (10) .4. Icplos 



2. Racemes very many, in whorls upon slender pedicels ; ^ 



these are arranged above one another, forming a 

 panicle. Sessile spikelets laterally or dorsally com- 

 pressed, awned or not distinguished from the next 

 (Chrysopogon) by the absence of a beard or rigid 

 hairs on the tips of the branchlets. (Subgenu.s 

 Vktiveria. ) 



3. A stout erect tufted grass with aromatic roots, 

 with many-jointed spikes and muricate 



glumes (11) ^4. .<i(/iiarn)sits 



2. Racemes whorled, pedicellate on the capillary branches 

 of an erect panicle, usually reduced to one or two 

 terminal joints. Spikelets somewhat laterally com- 

 pressed. (Subgenus Chrysopocon. ) 



3. Stem creeping, the flowering branches erect, the 



callus long, acicular (12). 4. ticifiilal iifi 



1. Sessile spikelet of the lowest pair or of several of the lower 

 pairs in each raceme, differing from the upper pairs in sox 

 or awns, or empty. (Series B. Hctcrozi/fji.) 



2. Racemes usually three to many, digitate, all pedicel- 

 late or all sessile, not subtended by a leaf-sheath. 

 Flowering glume usually stalk-like. (Subgenus 



DlCIIANTHIUM.) 



3. A slender erect grass with digitate, dens(>ly 



villous racemes (13) /I. srrii-cus 



2. Racemes solitary or terminal ui)on the culm or its 

 branches. Spikelets imbricated, the first tn (ifth 

 pairs homogamous, Awns large, those of all the 

 spikelets with a jiDinlcd callus. (Subgenus I1i:ti;- 



!!OPf)C!ON.) 



3. First glume flat dorsally (15), 4. conlorliin 



3. First glume deeply channeled dorsally (14), 4. Iriticciift 



2. Racemes In pairs, terminal upon the culm or its 



branches, one sessile, always with 1 to 2 basal 



liomoganious pairs of stamlnate spikelets, the other 



short pcdicclled, with or without liomoganious pairs, 



both together subtended by a sheathing leaf, fro 



(luently arranged in a false panicle inlenii|il( d by 



leaves. (Subgenus CVMP.oPoco.N. ) 



