ORAMINEiE. 44S DACTYLIS. 



19. P. Eragro'stis. Quake Grass. 



Stc7n ohVique or decuiiibenl, geniculate, 1 — 2 feet long; leaves lanceolate, 

 attenuate at end, scabrous on the margin and above; s/(cat/;s pilose at the 

 throat ; stipule short, bearded ; piniide expanding, branches subdivided, flexu- 

 ous, subpilose in the axils ; spiketets ovate-oblong, 1:2 — 20-fio\vered ; glumes 

 nearly equal. A beautiful grass, introduced into fields and roadsides. Aug. 



37. BRIZA. 

 Spikelels cordate ovate, 6 — 9-flowered ; glumes 2, shorter 

 than the lower flowers; paleae venlricose, lower one cordate 

 at base, embracing the upper which is suborbicular and much 

 shorter; carjopsis beaked. 



B. me'dia. 



Stem nalied above, 1 — 2 feet high ; leaves flat, sn>oolh, lance-linear ; stipules 

 short, obtuse ; panicle erect, few-tiowered, branches wide-spreading, capillary, 

 purplish, bearing the ovate or cordate, tumid, pendant and tremulous spikelels 

 at the ends, these are about 7-tio\vered, greenish purple; palea nerveless. 

 Naturalized in the vicinity of Boston. Bw. May. 



38. UN I' OLA. 



Spikelets compressed, 3 — 20-flowered ; lower flower abor- 

 tive; gh}mes 2, shorter than the lower flower; lower paleae 

 boat-shaped at the end, truncate and mucronate between the 

 lobes, upper subulate, somewhat bifid; scales emarginate; 

 carjopsis with 2 horns. 



1. U. spica'ta. 



Stan smooth, round, branched at base, 1 — 2 feet high ; cauJine hazes numer-^ 

 ous, 3 — 6 inches long, involute, rigid and acute; sheaths longer than the 

 joints, close, upper ones hairy at throat; stipule inconspicuous; panicle 

 densely spicate, consisting of short, fasciculate branches v/ith sessile spikelets ; 

 spikelets oblong, 5 — 9-flovvered ; jlowers triandrous. Salt marshes. July. 



2. U. gka'cilis. Mx. 



Stem slender, leafy, '^ — 4 feet high ; leaves broad-linear, tapering to a slender 

 point, flat, 12 — 18 inches long ; sheaths sliorter than the joints ; panic' e long, 

 racemose, branches solitary, short, remote, erect ; spikelets 3-flowered ; floioers 

 spreading, straight, monandrous; ^itt7jjes rigid, acute. Sea coasts. N. Y. Aug. 



39. DA'CTYLIS. 



Spikelets aggregated, compressed, 3 — 5-flowered ; glumes 

 unequal, the larger one carinate, shorter than the flowers; 

 paleai subequal, lanceolaie, acuminate, the lower one emargi- 

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



D. glomera'ta. Orchard Grass. 



Stem roughish, 2 — 4 feet high; ?cfft>«s linear-lanceolate, carinate, a little 

 scabrous, glaucous; sheaths striate; stipule lacerate; panicle remotely 

 branched, rather secund ; spikelets about 4-flowered, in dense, glomerate, 

 unilateral, terminal clusters; glumes very unequal ; on/Acrs large, yellow. 

 A fine, well known grass, of rapid growth, introduced in shady fields, as 

 orchards, &c. June. 



