IO42 APPENDIX. 



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

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



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, i 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: 



loa. 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, la. to Miss, and Tex. July-Sept. Intermediate be- 

 tween A. gracilis and A. purpurascens, 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- 

 cent 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 5\ 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 i 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 mm- long. In dry fields, thickets 

 and woodlands, Va. (according to T. H. Kearney, Jr.) to Fla., the Ind. 

 Terr, and Tex. Aug. and Sept. Differs from E. capillaris in its stouter 

 and taller culms, strongly papillose-hispid sheaths, and elongated leaves. 



P. 131, after Eragrostis secundiflora Presl, insert: 



i2a. Eragrostis capitata (Nutt.) Nash. Culms branching and creeping, 

 rooting at the nodes, which send up branches 6-10 cm. long; sheaths, at least 

 those on the branches, pubescent; leaves spreading or ascending, 1-3 cm. 

 long, 1.5-3 mm. wide, flat, lanceolate, pubescent; panicle 2-3 cm. long, 

 nearly or quite as broad, oval; spikelets crowded, clustered, 12-30- 

 flowered, 6-14 mm. long. (Poa capitata Nutt.) In sandy, usually wet soil, 

 Ark. and La. to Neb., N. Mex. and Tex. Also in Mexico. June-Aug. 

 Differs most prominently from E. hypnoides (Lam.) B.S.P. by its longer 

 pubescent flowering scales. 



P. 132, in Eatonia obtusata (Michx.) A. Gray, third line, omit the 

 jvords "sometimes pubescent"; add: 



