1062 APPENDIX. 



tinum L., in the softer pubescence, naked leaf-margins, and smaller 

 spikelets. 



P. 90, before Chaetochloa occidentals Nash, insert: 



2a. Chaetochloa imberbis (Poir.) Scribn. Perennial Foxtail-grass. 

 Perennial. Culms tufted, 3-7 dm. tall, from rootstocks, slender, com- 

 pressed, rough below the raceme; sheaths glabrous, compressed; leaves 

 1-3 dm. long, 3-7 mm. wide, the upper surface often with a few long hairs 

 at the base; racemes dense, spikelike, 2-5 cm. long, nearly 1 cm. in diam- 

 eter, exclusive of the bristles, the rachis pubescent; bristles 5-10 mm. long; 

 spikelets ovoid, acute, 2-2.5 mm - long, the flowering scale acute, striate, 

 finely transverse-rugose. In moist soil, N. J. to Fla. and Tex. ; and in Kans. 

 and Mo. Also in Tropical America. June-Aug. Differs from C. glauca in 

 having the bristles green or purplish instead of tawny yellow, and in being 

 perennial instead of annual. From C. versicolor Bicknell it is distinguished 

 by the 5-7-nerved second scale of the spikelet. 



P. 90, after Cenchrus tribuloides L., insert: 



ia. Cenchrus macrocephalus (Doell) Scribn. Large Bur-grass. Culms 

 at first erect or ascending, finally falling prostrate, becoming branched 

 and forming mats, 3-6 dm. long; sheaths very loose, glabrous, com- 

 pressed; leaves flat or complanate, smooth and glabrous, 1 dm. long or less, 

 4-8 mm. wide; spikes stout, 3-5 cm. long; involucres 5-12, 6-8 mm. 

 broad, enclosing 2 spikelets, pubescent, the spines usually 5-8 mm. long, 

 the spikelets not exserted beyond the involucre. Along the seashore, 

 N. J. to Miss. July-Sept. Differs from C. tribuloides L. in having the in- 

 volucres much larger; in that species they are usually less than 5 mm. 

 broad. 



P. 95, after Aristida gracilis Ell., insert: 



10a. Aristida intermedia Scribn. & Ball. Intermediate Aristida. 

 Culms slender, finally branching, 3-8 dm. tall; sheaths glabrous or sparsely 

 hirsute; leaves 5-15 cm. long, 2 mm. wide or less, erect, involute; panicle 

 2-4 dm. long, slender, its branches appressed; spikelets 8-10 mm. long, 

 the empty scales manifestly awned, about equal, the flowering scale 

 strongly hispidulous above the middle, equalling or exceeding the empty 

 scales, the awns spreading, the middle one 15-25 mm. long, the lateral ones 

 shorter. In sandy soil, Ia. to Miss, and Tex. July-Sept. Intermediate be- 

 tween A. gracilis and A. purpiirascens, having the large spikelets of the 

 latter, and more the habit of the former. 



P. 105, before Sporobolus longifolius (Torr.) Wood, insert: 

 ia. Sporobolus canovirens Nash. Southern Rush-grass. Culms erect, 

 3-10 dm. tall; leaves 2.5 dm. long, or less, 1-3 mm. wide, attenuate and 

 filiform above; panicle 5-13 cm. long; spikelets 5-6 mm. long, the scales 

 acuminate, the empty ones unequal, the flowering scale appressed-pubes- 

 ccnt below with long hairs, about equalling or a little exceeded by the 

 acute palet. In dry sandy soil, Tenn. to Mo., Kans., Miss, and Tex. 

 July-Sept. Resembles S. asper, but the spikelets are smaller, and the 

 palet much shorter relatively, equalling or but little exceeding the flower- 

 ing scale. 



P. 130, after Eragrostis capillaris (L.) Nees, insert: 



ia. Eragrostis hirsuta (Michx.) Nash. Hairy Eragrostis. Culms 

 densely tufted, rather stout, 7-13 dm. tall; sheaths, at least the lower ones, 

 strongly papillose-hispid, each with a tuft of hairs at the apex; leaves flat, 

 the lower ones 4-6 dm. long, less than 1 cm. wide; panicle 5-8 dm. long, 

 diffuse, its branches finally widely spreading; spikelets 3-5-flowered, 3-4 

 mm. long, the flowering scales 2-2.5 rnm. long. In dry fields, thickets 



