Obdeb 156.— GRAMINE^E. 793 



nodes, 10 — 18'; lvs. subulate, the upper ones shortor than the sheaths, hairy be- 

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

 the leaves, the upper one partly exserl; spikelet 3-nowered; awn of the pale about 

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

 to l!a. Taste of the plant bitter. Aug. (U. aristulata Nutt.) 

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

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

 subuqual, 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. oYkrvAoc, a finger ; 

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

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

 than the flowers ; paleee 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; lvs. 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. — 1£ A fine, well-known 

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



34. KdLE'RIA, Pers. (In honor of M. Kceler, 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 eeespitous, erect, 

 simple, with dense panicles. 



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

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

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

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

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

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

 Nutt.), is smaller and more delicate. 



35. DIARRHE^NA, Raf. (Gr. dig, two, dpprjvr]^, rough ; from the 

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

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

 palese cartilaginous, lower cuspidate, upper much smaller, emarginate ; 

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



D. diandra. Culm erect, nearly leafless, slender, rigid, 15 — 30'; lvs. few, sub- 

 radical, broadly linear, flat, rough-edged, 10 — 1G' by 5 — 7", nearly glabrous; 

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

 Bpikelets 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 ? — River banks, Ohio to 111. (D. Americana Beauv. 

 Festuca Mx.) 



36. FESTITCA, L. Fescue Grass. (The ancient Latin name.) 

 Spikelets 3 to co-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 ; earyopsis linear-oblong, mostly adherent to the upper 

 pale. — Spikelets in racemes or panicles, the fis. remote, not "webbed at 

 base. 



