eoo CLXI. GR AMINES. Psamma. 



long ; palea 5-vemed, a little shorter than the upper glume ; sta. 3 ; stig. plu- 

 mose. — % N. J. to Car. Aug. 

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



5. T. coNciNNA. Wood. (Agrostis concinna. Tuckm.) 



St. low, erect ; Ivs. filiform-setaceous ; pa7i. ovate, spreading, glabrous ; 

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

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

 flower, with a few hairs at its base. — White Mts. Tiickerman. — The species are 

 not valuable in agriculture. 



9. M UHLENBERGIA. Schreb. 



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



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



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

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



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



St. decumbent, diffuse, branching, 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 

 pedicellate, often purple ; aioi about as long as the paleae. — % 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 — 3i high ; Ivs. lanceo- 

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

 what open sheaths ; panicle terminal, simple racemose, contracted ; spikelets 

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

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

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



10. CINNA. 

 Glumes 2, subequal, compressed, without involucre or awns, upper 

 one 3-veined ; paleae 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. monandra. Hornem.) 

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

 pale green, rough-edged, with smooth, striate sheaths ; slip, long, lacerated ; 

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

 branches capillary, di'ooping, and arranged somewhat in 4s ; glumes linear-lan- 

 ceolate ; lower palece 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. TRICHOCHLOA. DC. 



Gr. rpi^, Tpi^oi, hair, X^°'^> grass ; from the capillary inflorescence. 



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

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

 a long, unarticulated awn. 



T. CAPiLLARis. DC. (Stipa. Lam. Agrostis. Muhl. Muhlenbergia. Lindl.) 

 Caespitose ; sts. erect, very slender and smooth, 18 — 24' high ; Its. erect, 

 becoming filiform towards the end. 1 — l^f long; panicle diffuse, with the 

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

 produced into an awn 3 or 4 times its length. — % An exceedingly delicate grass, 

 with large, purple, glossy and almost gossamer-like panicles, waving in the 

 breeze. Sandy soils. Jn. Jl. 



12. PSAMMA. Palis. 

 Gr. i//a/^//oj, sand ; in which this grass grows on the sea shore. 



Panicle spicate ; glumes 2, awnless; paleae 2, shorter than the 



