603 CLXl. GRAMINEiE. Paspalum 



1, A. PRATENsis, Fox-tail Grass. 



St. erect, smooth, leafy, about 2f high, bearing an erect, dense, many- 

 flowered, cylindric, obtuse, compound spike, about 2' long ; Ivs. flat, smooth, 

 with swelling sheaths and ovate stipules ; glumes ciliate, connate below the 

 middle, as long as the palese ; aicji twisted, scabrous, twice the length of the 

 flower. — 1\- Fields and pastures. Northern States. An excellent grass. Jn., Jl. ^ 



2. A. GENicuLATUS. Be?it Fox-tail Grass. 



St. ascending, geniculate, rooting below, sparingly branched, 1 — 2f high; 

 spike cylindrical, about 2' long; Irs. linear-lanceolate, smooth, flat, acute, a few 

 inches in length, with slightly inflated sheaths, and long, entire stipules ; glumes 

 slightly connate at base, hairy outside ; palccB truncate, smooth, half as long as 

 the geniculate awn. — ^l- Wet meadows, N. Eng. ! Mid. States and Brit. Am. Jn. 

 /?. aristulatus. Torr. (A. aristulatus. Mx.) Awns very short. 



15. CRYPSIS. Ait. 



Gr. Kfvnjis, concealment ; from the flowers being concealed in the sheatlis. 



Inflorescence an oblong spike ; glumes 2, unequal, compressed, 1- 

 flowered ; paleas 2, unequal, longer than the glumes ; sta. 2 — 3 ; ca- 

 ryopsis loose, covered by the paleas. 



C. VlRGINlCA. Nutt. 



St. procumbent and geniculate, 6 — 12' long, much branched from the base; 

 Its. finally involute, divaricate, short, rigid and pungent, subpilose above; spi/:cs 

 oblong-cylindrical, thick and lobed, more or less enclosed in the inflated ."^heaths 

 of the leaves, the terminal one about 1' long, lateral shorter and subcapitate; 

 glumes roughened on the keel, the upper a little longer. — About Philadelphia, 

 Barton. Sept., Oct. 



16. PHLEUM. 



Gr. <p\eoi ; used by the ancients probably for a different plant. 



Glumes 2, equal, carinate, much longer than the palese, rostrate or 

 mucronate ; paleoe 2, included in the glumes, truncate, awnless. 



1. P. PRATENSE. Timothy or Herd's Grass. 



St. erect, simple, terete, smooth, 2 — 4f high ; Ivs. linear-lanceolate, fiat, 

 glaucous, roughish ; shcalhs striate, smooth ; slip, obtuse, lacerated ; glumes ap- 

 parently bicuspidate, in a dense, long, cylindric, green spike; anth. purple; 

 slig. white. — This is probably the most valuable of all grasses. It is extensively 

 cultivated, N. Eng., Mid. and W. States, and is probably native. 



2. P. ALPiNUM. Mountai?i Herd's Grass. 



St. about If high, simple, erect ; Ivs. shorter than the sheaths, broad and 

 clasping at base, acute at apex, smooth ; sheaths inflated ; spicate panicle oblong- 

 ovate, very short (4 — b" long) ; glumes truncate, mucronate, with a fringed keel; 

 avms as long as the glumes. — % Alpine regions of the White Mts., N. H. 

 Also native of Arc. Am. 



Tribe 4. PANICEJE. — Inflorescence spiked or panicled. Spikelets 1 or 

 (more usually) 2-flowered, one of the flowers being sterile or imperfect. 

 Glumes usually (membranaceous) of a thinner texture than the paleae, which 

 are more or less cartilaginous, the lower palea half enfolding the upper, 

 sometimes awned, 



17. p ASP Alum. 



Gr. 7ra(Tva\os, millet; from the resemblance of the seeds. 



Flowers in unilateral spikes ; glumes 2, membranaceous, equal, 

 suborbicular, closely pressed to the 2 paleae ; stigmas plumose, colored ; 

 caryopsis coated with the smooth, plano-convex paleae. 



1. P. SETACELM. Michx. (P. ciUalifolium. Torr., cf-c, not of Michx.) 

 St. erect, very slender, 1 — 2f high, simple or branched from the base, with 



