OBDER 156. GK AMINES. 793 



nodes, 10 18' ; Ivs. subulate, the upper ones shorter than the sheaths, hairy be- 

 neath ; pan. simple, racemous, terminal and lateral, concealed in the sheaths of 

 the leaves, the upper one partly exsert ; spikelet 3-flowered ; awn of thepale about 

 as long as the lateral, obtuse segments. Sea coast, among the drifting sands, Mass, 

 to Ga. Taste of the plant bitter. Aug. (U. aristulata Nutt.) 

 2 U. cornuta Ell. Culm 2f high, and with the narrow (1") leaves and sheaths 

 hairy; pan. slender, composed of a few small, few-flowered branches; glumes 2, 

 subequal, very acute, purple as well as the 2 pales ; upper pale longer than the 

 glume, the midvein prolonged in an elongated, at length 'recurved awn beyond the 

 segments. S. States. (Triplasis Americana Beauv.) 



33. DAC'TYLIS, L. ORCHARD GRASS. (Gr. dditrvXo^ a finger; 

 from the form of the spikes.) Spikelets aggregated, compressed, 3 5- 

 flowered ; glumes unequal, herbaceous, the larger one carinate, shorter 

 than the flowers ; palese subequal, lanceolate, acuminate, the lower one 

 emarginate, carinate, mucronate, upper bifid at apex ; scales dentate. 

 Lvs. carinate. Pan. composed of dense clusters. 



D. glomerata L. Culm roundish, 2 4f ; Ivs. linear-lanceolate, carinate, a little 

 scabrous, glaucous; sheaths striate; stip. lacerate; pan. remotely branched, 

 rather secund*; spikelets about 4-flowered, in dense, glomerate, unilateral, termi- 

 nal clusters ; glumes very unequal , anth. large, yellow. U A fine, well-known 

 grass, of rapid growth, introduced in shady fields, as orchards, &c. June. Eur. 



34. KCELE'RIA, Pers. (In honor of M. Koeler, a German botanist.) 

 Spikelets compressed, 2 to 7 -flowered ; glumes 2, subequal, acute or 

 acuminate, shorter than the flowers ; upper flower pedicellate ; pales 2, 

 the lower often acuminate-mucronate. 2 Grasses casspitous, erect, 

 simple, with dense panicles. 



K. cristata Smith. Culm 20 30' high, smooth, leafy to one-half its height, 

 rigidly erect; Ivs. flat, erect, pubescent, 2 3" by 1 2", shorter than their pu- 

 bescent sheaths ; stip. short, lacerate ; panicle spicate, narrow, 3 5' long, 6 8" 

 diam., branches very short ; spikelets 2" long, silvery and shining, compressed, 

 about 2-flowered, with an abortive pedicel ; glume linear-oblong, acute, serrulato 

 on the keel, upper one longer. Mid., "W. States and Can. A variety (K. nitida 

 Nutt.), is smaller and more delicate. 



35. DIARRHE V NA, Raf. (Gr. &V, two, dpprprig, rough ; from the 

 two scabrous keels of the upper paleae.) Panicle racemous or simple ; 

 glumes 2, very unequal, 2 5-flowered, rigid, acuminate, mucronate ; 

 palea) cartilaginous, lower cuspidate, upper much smaller, emarginate ; 

 caryopsis coated, as long as the upper pale ; scales ovate, ciliate. 



D. diandra. Culm erect, nearly leafless, slender, rigid, 1530' ; Ivs. few, sub- 

 radical, broadly linear, flat, rough-edged, 10 16' by 5 7", nearly glabrous; 

 sheaths close ; stip. obsolete ; panicle very simple and slender, branches erect, few , 

 spikelets 2-flowered; glumes broad-ovate, upper twice larger, 5-veined; pales 

 much longer than the glumes, the upper with 2 roughish, green keels, and con- 

 spicuously mucronate ; sta. 2 ? Eiver banks, Ohio to 111. (D. Americana Beauv. 

 Festuca MX.) 



36. FESTITCA, L. FESCUE GRASS. (The ancient Latin name.) 

 Spikelets 3 to oo-flowered ; glumes 2, unequal, mostly carinate ; pales 

 firm, naked, the lower rounded (not carinate) on the back, obscurely 

 veined, acute, or mucronate, or awned ; stamens 3, rarely 1 or 2 ; stig- 

 mas plumous ; caryopsis linear-oblong, mostly adherent to the upper 

 pale. Spikelets in racemes or panicles, the fls. remote, not webbed at 

 base. 



