ORDER 15G. GRAMINEJE. V77 



terruptea, 2 3' long, many-flowered ; glumes linear, \ the length of their awns ; 

 lower paleas mucrouate. if Bog meadows, also 011 rock/ mountains, N. Eng. to 

 Mo. Aug., Sept. (Polypogon raceinosus Nutt.) 



2 M. Mexicana Trin. Culm erect or ascending, with swelling nodes, much 

 branched and leafy above, often nearly leafless below, 1^ 3f high; Ivs. lanceolate, 

 scabrous, with half-clasping sheaths; panicles numerous, terminal and lateral, 

 spike-duattred, dense-flowered and purple-spotted, lateral ones partly enclosed in 

 the sheath ; glumes narrow acuminate, mostly shorter than the subequal, pubes- 

 cent pales. if Wet shades, N. Eng. to Wise., common. Aug. (Agrostis L.) 



3 M. sobolifera Gray. Culm erect, slender, producing shoots at base, branched, 

 18 30' high; branches erect and filiform; nodes not swelling ; Ivs. linear-lanceo- 

 late, with open sheaths ; panicle simple, filiform, with appressed branches, and 

 rather crowded spikeleta ; paleae equal, longer than the acute glumes. If Rodky 

 hills, N. Eng. to 111. and S. States, frequent Aug. (Agrostis Muhl.) 



4 M. sylvatica Torr. & Gr. Culm ascending, 2 3f long, much branched, diffuse, 

 smooth, with swelling nodes; Ivs. lanceolate, scabrous, veined, 4 6' long, with 

 smooth, open sheaths ; panicles slender, rather dense ; glumes nearly equal, acu- 

 minate, a little shorter than the palece ; awns several times longer than the spike- 

 let. If Rocky shades, K Y. to 111., N. J., Penn. Sept. (Agrostis Torr.) 



5 M. Willdenowii Trin. Culm erect, subsimple, pubescent at tho nodes, with 

 a few appressed branches; Ivs. 6 9' by 2 3'', lanceolate, veined, scabrous, 

 spreading, with pubescent sheaths; panicle contracted, very slender and long, 

 with remote, filiform branches ; glumes subequal, acuminate, half as long as the 

 palece; awn 3 4 times the length of the spikelet. 2f Rocky woods, Can. and 

 U. S. July, August. (Agr. tenuiflora Willd.) 



6 M. diffusa Schreb. Culm decumbent, diffuse, Iranching, slender, compressed ; 

 branches assurgent; Ivs. 2 3' by 2", linear-lanceolate, rough, with smooth, 

 striate, open sheaths; panicles terminal and lateral, with remote, appressed, 

 rough branches; spikelets 2" long, pedicellate, often purplo; awn about as lo'ng 

 as the paleas; glumes extremely minute. 2f Borders of woods and shady fields, 

 N. Eng. to Car. and Ky. Aug. 



7 M. aristata Pers. Culm erect, simple, retrorsety pubescent at the nodes, 1 3f 

 high; Ivs. lanceolate, scabrous, ciliate on tho margin, 4 6' long, 3'' or more 

 wide, with somewhat open sheaths; panicle terminal, simple, racemous, con- 

 tracted; spikelets 6" (16" including the awn) long, pedicellate; glumes minute, the 

 lower obsolete ; lower paleae half as long as its awn, upper paleae with a short 

 awn (abortive pedicel) at base lodged in the dorsal groove. if Rocky hills, Can. 

 and TJ. S., frequent. July. (Brachyelytrum Beauv. M. erecta Roth.) 



8 M. capillaris Kunth. Csespitous; culms erect, very slender and smooth, 18 

 24' high; Ivs erect, becoming filiform towards the end. 1 lf long; panicle 



. diffuse, with the branches 1 4' long, in pairs, and as fine as hairs; spikeleta 

 purple; lower paleaj produced into an awn 3 or 4 times its length. If Sandy 

 soils, N. Eng. to Ga. and Ky. An exceedingly delicate grass, with large, purple, 

 glossy and almost gossamer-like panicles, waving in the breeze. Jn., Jl. (Tri- 

 chochloa DC.) 



8. POLYPO'GON, Dcsf. POL YPO a GRASS. (Gr. TroK-f, many, 

 beard.) Spikelets 1 -flowered, densely panicled ; gls. 2, subequal, thin, 

 carinate, both similarly awned, much longer than the flower ; pales 

 thin, the lower usually awned near the tip, upper bicarinatc ; grain free, 

 oval, smooth. Leaves flat. Panicle spike-like. 



P. Monspellensis Desf. Culm simple, decumbent below, If or more high; Iva. 

 lance-linear, much shorter (2 to 5' by 2 to 3''), acute-pointed, minutely downy ; 

 panicle much-branched, spicate-lobed, 2 to 3', the branches very short and dense- 

 flowered, pale ; gls. hispidulous, 1" long, the awns a little longer. Fields, coast- 

 ward, N. Eng. ? common South. Eur. 



9. CALAMAGROS'TIS, Adatis. (Name compounded of Calamus and 

 Agrostis.) Spikelets 1-flowered ; glumes 2, subequal, acute or acuini- 



