SRAMINES:. 434 CALAMAGROSTIS. 



9. CINNA. 



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

 upper one 3-nerved ; palcEc 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. arundina'cea. 



Stem simple, erect, smooth, 3 — 5 feet high ; leaves linear-lanceolale, 12 — 18 

 inches long, 3 — 5 lines wide, nerved, pale green, rough-edged, with smooth, 

 striate sheaths ; stipule long, lacerated ; panicle near a foot in length, rather 

 attenuated ahove and nodding, with the branches capillary and arranged 

 somewhat in 4s ; glumes linear-lanceolate ; loiocr palea with a short, straight 

 awn a little below the tip. A beautiful grass, sought by cattle, in rich, shady 

 soils. Aug. 



10. TRICHO'CHLOA. 

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

 glumes, naked at base, lower one convolute at base, terminat- 

 ing in a long, unarticulated awn. 



T. capilla'ris. Do. Hair Grass. 



Ceespitose; stems erect, very slender and smooth, 18 — 24 inches hio-h; 

 leaves erect, becoming filiform towards the end, 1 — H footlong ; panicle diffuse, 

 with the branches 1 — 4 inches long, in pairs, and as fine as hairs; spikdels 

 purple ; lou^'er palea produced into an awn 3 or 4 times its lenoth. An ex- 

 ceedingly delicate grass, with large, purple, glossy and almost gossamer-like 

 panicles, waving in the breeze. Sandy soils. Jn. JI. 



11. PSAMMA. 

 Panicle spicate ; glumes 2, awnless; palese 2, shorter than 

 the glumes, surrounded with hairs at base ; scales linear- 

 lanceolate, longer than caryopsis ; styles 3-parted ; stig. 3. 



P. arena'ria. p. de B. Mat Gi-ass. Arundo arenaria. L. 



Root creeping extensively ; stem erect, rigid, 2 — 4 feet high ; leaves involute, 

 a foot in length, -^ inch wide, smooth and glaucous, pungcntlj' acute ; sheaths 

 smooth ; stipule oblong ; panicle dense, with erect, appressed branches, C — 10 

 inches long, and an inch thick ; spikelets compressed, greenish white ; loicer 

 ^jaka. longer than the upper. On sandy .sea-coasts. At Dorchester, Mass., 

 this grass is extensively' manufactured into paper. Aug. 



12. CALAIMAGRO'STIS. 

 Panicle contracted ; glumes 2, subequal, acute or acuminate ; 

 palese 2. mostly shorter than the glumes, surrounded with 

 hairs at base, lower one mucronate, mostly awned below the 

 tip, the upper one often with a stipitate pappus at base. 



1. C. Canade'ksis. Beff««. Real Grass. C. Mesicana. jYi^/^ Arundo. .¥a;. 

 Siem smooth, erect, rigid, 3 — 5 feet high ; ?e>'a'cs linear-lanceolate, striate, 

 with smooth, nerved sheaths; /j«7it(;^e erect, rather loose, oblonor.the branches 

 capillary, aggregated in 4s and 5s; glumes very acute, smoothish, much 

 longer than the palece ; loicfr paha bifid at the apex, with an exserted awn 

 arising from below the middle of the back. Wet grounds. Common. Aug 



