ORDER 155. GHAMIXE^E. 



Hairs? copious silky, longer than the gl. Sta. 1 Nos. 13 



Haw-? shorter than the glumes. Sta. 3 (1 in No. 4). . . (a) 



a Spikes digitate. 2 4 together at summits Nos. 4, 5 



a Spikes single, one at the top of each branch.. Nos. 6 8 



a Spikes clustered, paniculate ; awns very long ffo, 9 



1 A. macrourua MX. Culm erect, 2 3f, much branched ; 



ppkl. very delicate, in pairs, with a spathe, very many, 

 forming a dense leafy, silky panicle ; sterile spikelet only 

 a pedicel ; 9 awn a straight bristle, 8", hairs 4". Wet 

 grounds, N. Y., and S. Sept. -f 



2 A. Virginiciis L. Culm triangular, tall (3 5f), the| 



upper half loosely paniculate and nodding; spikes (like 

 No. 1, light and feathery, 1', two from each spathe) scat- 

 tered ; sterile spikelet a mere pedicel ; awns 9" ; spathe 2'. Dry soils. Sept., Oct. 



3 A. argeiiteus Ell. Culm purplish, slender, 1 3f; branches 1 or 2 at each upper 



node, each with a pair of spikes 1215" long at top : fls. concealed by the silvery- 

 white hairs ; awn 7 8". No spathe. Dry soils, Va., and S. Sept., Oct. 



4 A. tetrastychus Ell. Culm erect, 2 3f; leaves and sheaths very hairy; branches 



1 or 2 at each node, each with 4 (rarely 2) spikes at top ; sterile spikelet an awnliko 

 glume only ; glume serrulate ; awn 4 times its length. Low lands, S. Sept. 



5 A. fnrcat us Muhl. Forked spike. Culm erect, 4 7f; Ivs. and sheaths glabrous; 



spikes purplish, digitate, in 2"s 5'c, 35' long: spkl. appressed, the stalked one i; 

 awn of the 5 flower bent, 8 10" long. Meadows and prairies : common. August. 



6 A. tener (Xees). Culms 2 3f, slender, rigid ; leaves narrow, rigid ; spikes erect, 2, 



slender; spkl. appressed ; pedicellate fl. neuter: 5 awn bent. 4 6". Dry barrens. 



7 A. cillatus (Nutt.) Culms 3--4f, with long linear Ivs. ; spikes 3 6', on long ped 



icels ; hairs close-pressed, white; spkl. awnless, the Ptalked one <J , Damp, S. 



8 A. scoparius MX. Broom G. (a) Culm 3f, erect, with erect, often fascicled 



branches; Ivs. more or less hairy; spikes sii-gle on the filiform pedicels, loose, 6-12- 

 flowc-red, hairs spreading nearly as long as the fls. ; 5 awn? (\" long, twisted ; stalked 

 flower (b) neuter, or (in ft. Halel) (d) staminate. In dry fields, forming tufts. 



9 A. inelanocarpns (Muhl.) Culms 4 8f; Ivs. glabrous; spikes numerous, clus- 



tered ; spkl. many, large, each from a subulate spathe, the 2 lower spathes longest, 

 glumo-like 5 awn a 4' long, twisted. Fields, Ga., Fl. Sept. + 



75. SORGHUM, Pers. BROOM CORN*. Spkl. in 2's and 3's, pauicled , 

 the middle spkl. complete, 2-flwd., lower fl. abortive. Lateral or lower 

 spkl. sterile. Glumes coriaceous, pales membranous. Sta. 3. Otherwise 

 like Audropogon. Culms simple. 



1 S. nutaiis (L.) Indian G. Wood G. Culm 2 4f; pan. elongated, 10 20', narrow, 



nodding; spkl. all tawny, the sterile reduced to mere pedicels in contact with the c . 

 all bristly ciliate ; awn contorted, longer than the flower, it Dry: common. 



2 S. 8ACCHARATUM. flroom Corn. Culm thick, solid, 6 lOf; leaves broad, downy at 



base; panicle large, diffuse, with the slender branches whorled ; 9 glumes hairy, 

 persistent. ^ E - Indies. 



3 S. VULOABE. Indian, Millet. Culm erect, 15 12f. round, solid ; leave? broad, keeled 



pan. compact, erect, oval ; glumes and pales caducous, fruit naked. E. Ind. The 

 Sugar Sorghum is regarded as a variety of this species. 



76. COIX LACRYMA. JOB'S TEARS. Culm 1 3f, solid, with erect, 

 fleuder branches clustered in the upper sheaths ; leaves lanceolate. Spikelets few in the 

 *ho:t spikes, awnless, the lowest enclosed in an involucre which becomes ovoid, bony, 



, and bluish-white, likened to a falling tear. Oardeus. From E. Indies. 



