§(^ CLXI. GRAMINEiE. PSamm*. 



long; palecE •b-veined, a little shorter than the upper glume; sta. 3; stig. plu» 

 mose. — 71. N. J. to Car. Aug. 



/?. laxa. Panicle more loose, with long, green branches. — White Mts. 



5. T. coNciNNA. "Wood. (Agrostis ccncinna. Tuckm.') 



St. low, erect ; Ivs. filiform-setaceous ; pan. ovate, spreading, glabrous ;; 

 gl. unequal, lower acute-mucronate, roughish above, upper acute, glabrous ;. 

 palea glabrous, awn from below the middle, contorted, scabrous, exceeding the 

 flower, with a few haire at its base. — White Mts. Tuckerman. — The species are 

 aot valuable in agriculture. 



; 9. MUHLENBERGIA. Schreb. 



In honor of the late Henry Miihlenberg, D.D., a well known, eminent botanist. 



Panicle nearly simple ; glumes 2, very minute, unequal, fringed \ 

 paleae many times longer than the glumes, linear-lanceolate, veined,, 

 hairy at base ; the lower one terminating in a long awn. 



1. M. DIFFUSA. Schreb. Dorp-seed Grass. 



St. decumbent, diffuse, brandling, slender, compressed ; bra^ichesassmgent -^ 

 Ivs. 2 — 3' by 2", linear-lanceolate, rough, with smooth, striate, open sheaths;; 

 panicles terminal and lateral, v/ith remote, appressed, rough branches; spikelcLs 

 pedicellate, often purple ; aiun about as long as the palese. — % Borders of woods- 

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



2. M. ERECTA. Roth. (Brachyelytrum aristatum. Palis.) 



St. erect, simple, retrorsely pubescent at the nodes, 2 — 3f high ; Ivs. lanceo^ 

 late, scabrous, ciliate on the margin, 4 — 6' long, 3" or more wide, with some* 

 what open sheaihs; pa7iicls terminal, simple racemose, contracted; spikelcti 

 pedicellate, large ; glumes very unequal, upper one subulate ; lower palem half as 

 long as its awn, upper palece with a short awn at base lodged in the dorsai 

 groove. — %. Rocky hills. Can. and U. S., frequent. July. 



10. CINNA. 

 Glumes 2. subequal, compressed, without involucre or awns, tipper 

 one 3-veined ; palese 2, naked at base, on short stipes, lower one 

 larger, enclosing the upper, with a short awn a little below the tip ■ 

 stamen 1. 



C. ARUNDiNACEA. Willd. (Agrostis Cinna. Lam. A. mcnandra. Homem,.) 

 St. simple, erect, smooth, 3 — 5f high ; Ivs. linear-lanceolate, 12 — 18' by 3 — 5" 

 pale green, rough-edged, v/ith smooth, striate sheaths ; slip, long, lacerated j, 

 panicle near a foot in length, rather attenuated above and nodding, with the 

 branches capillary, drooping, and arranged somewhat in 4s ; glumes linear-lan- 

 eeolate ; loioer palea with a short, straight awn a little below the tip. — % A 

 beautiful grass, sought by cattle, in rich, shady soils, U. S. and Can. Aug. 



11. TRICHOCifLOA. DC. 



Gr. rpt^, Tft^os, hair, ^\oa., grass ; from the capillary inflorescence. 



Glumes 2, yery minute ; paleae many times longer than the 

 glumes ; naked at base, lower one convolute at base, terminating in; 

 a long, unartieulated awn. 



T. CAPiLLARis. DC. (,Stipa.Z,(i7«. Agrostis. Miihl. Miihlenhevgia. LiTidl.} 

 Csespitose ; sts. erect, very slender and smooth, 18 — 24' high ; Ivs. erect, 

 becoming filiform towards the end. 1 — IJf long; panicle diffuse, with the 

 branches 1 — 4' long, in pairs, and as fine as hairs ; spikekts purple ; lower palcce 

 produced into an awn 3 or 4 times its length. — 1\. An exceedingl}' delicate grass, 

 with large, purple^ glossy and almost gossamer-like panicles, v/aving in the 

 breeze. Sandy soils. Jn. Jl. . • 



12. PSAMMA. Palis. 

 Gr. xpanjzoi., sand; in which this grass grows cm the sea shore. 



Panicle spicate ; glum.es 2, awnless ; paleae 2, shorter than tha 



