Or.DEu 158. GRAMINE^E. 



411 



a K 



5 Hair* copious silky, longer than the gl. Sta. 1 Noa. 1 3 



Hairs shot-tor than the glumes. Sta. 3 (1 in No. 4). ..(a) 



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



a Spikes single, one at the top of each branch Nos. 68 



a Spikes clustered, paniculate; awns very long No. 9 



J A. macrourna MX. Culmerect,2 3f, much branched ; 

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

 forming a dense leafy, silky panicle ; sterile spikelet only 

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

 grounds, N. Y., and S. Sept. + 



2 A. VIrgiiilcus L. Culm triangular, tall (3 5f ), thes 



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. arg^nteus Ell. Culm purplish, slender, 1 3f ; branches 1 or 2 at each upper 



node, each with a pair of spikes 12 15" long at top : fls. concealed by the silvery- 

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



4 A. tetrastyclius 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 awnlikr 

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

 J> A. ftiroiit n* Mnhl. Forked spike. Culm erect, 4 7f; Ivs. and sheaths glabrous: 

 spikes purplish, digitate, in 2's 5V. 35' long; spkl. appressed, the stalked one t : 

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



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



slender: spkl. appressed ; pedicellate fl. neuter; 9 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 stalked one <5 .' Damp. S. 



8 A. ctroyarlus 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 

 flowered, hairs spreading nearly as long as the fls. ; s awns ti" long, twisted ; stalked 

 flower (6) neuter, or (in /3. Haiti) (d) staminate. In dry fields, forming tuft.*. 



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



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

 glnir.e-like 9 awn 3 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 Andropogon. Culms simple. 



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



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

 all bristly ciliate ; awn contorted, longer than the flower. 11 Dry: common. 



2 S. SACCHAUATUM. Broom Corn. Culm thick, solid, 6 lOf ; leaves broad, downy nt 



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

 persistent. ( E- Indies. 



3 S. VULGARB. Indian Millet. Culm erect, 6 12f. round, solid ; leaves 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 2f, solid, with erect 

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

 hort spikes, awnless, the lowest enclosed in an involucre which becomes ovoid, bony 

 polished, and bluish-white, likened to a falling tear. (I) Gardens. From B. Indi= 



