AGROSTIDEiE. 343 



toothed, the stout twisted awn starting below the middle and ex- 

 tending 0.5 mm. above the floret, hairs few and weak, half as long 

 as the floral glume, the hair}^ rudiment 0.5 mm. long. 



Pennsylvania (dry woods in Huntington County), Porter; New 

 York, Difdlej/. 



9. C. Macouniana Vasey, Coutrib. U. S. Nat. Herb. 3:81 

 (1892). Deyeuxia Macounia)ia Yasej, Coult. Bot. Gaz. 10:297 

 (1885). 



Culms from creeping rootstocks, slender, erect, branching 

 sparingly along the middle, 60-90 cm. high, internodes about 5 in 

 number, besides the very short ones below. Sheaths nearly smooth, 

 longer than the internodes; ligule lacerate, thin, 2 mm, long; blades 

 scabrous, flat or involute, apex attenuate, the blade 15-25 cm. long, 

 2-3 mm. wide. Panicle open, 10-12 cm. long, 2—4 cm. broad; 

 rays mostly in fives, erect, slender, clusters 1-1.5 cm. distant. 

 Spikelets purple below, mostly on the upper part of the branches, 

 oval-lanceolate, about 2 mm. long; first glume ovate-lanceolate, 1- 

 nerved, second a little shorter, 3-nerved, otherwise like the first; 

 floral glume ovate, oblong, 2-lobed, 1.5 mm. long, awn near the 

 middle of its glume, straight, reaching a little beyond its apex ; palea 

 oval, 1 mm. long, apex truncate-toothed, hairs as long as the floret, 

 hairy rudiment one-third mm. long. 



British America, Macoun for U. S. Dept. Agricul. 44. 



Borders of marshes. 



10. C, Scribneri. Deyeuxia diihia Scribn. Coult. Bot. Gaz. 

 11:174 (188G). Calamagrostis duUa Vasey, Contrib. U. S. Nat. 

 Herb. 3: (1892). 



Perennial; culms rather slender, erect, 60-90 cm. hio-h. 

 Sheaths scabrid, much shorter than the internodes; ligule 3 mm. 

 long, decurrent; blades scabrous, about 20 cm. long, 4 mm. wide. 

 Panicle lanceolate, about 15 cm. long; rays erect, 3-6, the longest 

 4-6 cm. long, flower-bearing on the outer three-fifths. Spikelets 

 subsessile or pedicellate, linear-lanceolate, 3-4 mm. long; empty 

 glumes equal, scabrid, second 3-nerved, bristle 0.5 mm. long, hairs 

 twice as long; floral glume oval, truncate, 4-toothed, 2-3 mm. 

 long, awn rather short, attached below the middle and extending 



