gl6 CLXI. GRAMINEiE. Uniola. 



spikelets terete, linear, purplish, about 5-flowered; /5. obtuse, indistinctly 5- 

 veined. — % Salt marshes, Ms., Blgeloic. June. 



18. P. AQUATicA. p. Americana. Torr. (P. aquatica. PA.) 

 Smooth ; st. stout, leafy, 4 — 5f high ; Ivs. broad-linear, flat, thin ; particle 

 erect, diffuse, branches at length spreading, flexuous, 3 — 5 together, in half 

 whorls ; spikelets linear, purple", with 6 — 8 ovate-obtuse flowers. — %. Wet.mea- 

 dows, Free States and Can. A very large, handsome poa. Aug. 



\9. P. DENTATA. Torr. 



Smooth ; st. erect, round, 3f high ; Ivs. flat, linear, 10 — 16' long, glaucotis 

 heneath ; stip. elongated ; panicle large, Ifiose, few-flowered, branches capillary, 

 spreading; .<:/)/Me^i- lanceolate, about 5-flowered ; loiver glume 3-veined ; lovx-^ 

 palea 5-veined, 5-toothed at the apex when old. — % Swamps, Mass., N. H. ! to 

 Penn. Not very common. Jiine, July. 



20. P. FAscicuLATA. Torr. 



Very smooth ; st. firm and leafy, oblique, round, branched at base, 1 — 2f 

 high ; Ivs. flat, lance-linear ; panicle spreading, branches fasciculate, ci'owded, 

 straight ; spikelets oblong, somewhat racemed, sessile, crowded, about 3-flow- 

 ered; glumes minute, unequal. — % Salt marshes, N. Y. 



21. P. PECTiNACEA. Michx. (P. pilosE. MiM. P. tenella. PA.) 



St. csespitose, oblique, geniculate at base, 8 — 12' high ; Ivs. flat, smooth,. 

 pilose at base, 5-veined, 2 — 4' long; sheaths bearded at the throat; panicle large^ 

 loose, capillary, purplish, hairy in the axils, branches subverticillate ; spikelets 

 linear, with 5—9 acute flowers ; upper 2Mlea persistent on the rachis which thus 

 is made finally to appear pectinate. — (i) In sandy fields, Mid. and S. States.. 

 July, Aug. 



22. P. REPTANS. 



(^9; st. branched, creeping, rooting at the joints, 6 — 12' long; Ivs. subu- 

 late, flat, 2 — 3' long ; sheaths open, pilose on the margin and throat ; panicle 

 I — 2' long, branches short, simple, in fascicles, few-flowered; spikelets linear- 

 lanceolate, with 12 — 20 acuminate flowers. — (I) Swamps, N. Y. to Ky. ! JL, Aug. 



23. P. Ekagrostis. (P. obtusa. Null. Briza eragrostis. Muhl.) 



St. oblique or decumbent, geniculate, 1 — 2f long; Ivs. lanceolate, attenu- 

 ate at end, scabrous on the margin and above ; sheaths pilose at the throat ; slip. 

 short, bearded ; panicle expanding, branches subdivided, flexuous, subpilose in 

 the axils; x/wMc/s ovate-oblong, 12 — 20-flowered ; glumes nearly equal. — (I) A 

 beautiful grass, introduced into fields and roadsides, N. Eng. to 111. 1 It has a 

 strong, peculiar odor. Aug. ^ 



42. BRIZA. 

 Gr. ppi^co, to nod, or hang down ; alluding to the pendulous spikelets. 



Spikelets cordate-ovate. 6 — 9-flowered ; glumes 2, shorter than the 

 lower flowers ; palea3 ventricose, lower one cordate at base, embracing 

 the upper which is suborbicular and much shorter ; caryopsis beaked. 



B. media. 



iS/. naked above, 1 — 2f high; Ivs. flat, smooth, lance-linear; stip. short, 

 obtuse ; panicle erect, few-flowered, branches wide-spreading, capillary, pur- 

 plish, bearing the ovate or cordate, tumid, pendant and tremulous spikelets at 

 the ends, these are about 7-flowered, greenish-purple ; palcce v^inless. — '2|.Natu- 

 ralized in the vicinity of Boston, Bigehw. May. 



43. UNI Ola. 



Lat. itmi^, one ; on account of the aggregation of many flowers into one spikelet. 



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

 glumes 2, shorter than the lower flower ; lower palea3 boat-shaped at 

 the end, truncate and muerouate between the lobes, upper subulate, 

 somewhat bifid; scales emarginate ; caryopsis with 2 horns. 



i. U. latifolia. Michx. Broad-leaved Uniola. 



St. 2 — 4f high, smooth, subsimple; Ivs. 8 — 18' by 6 — 12", lance-linear, 



