ORDER 155. GRAMINE^E. 



409 



1 B. curtlpendula (Mx.) (c) Calm ascending, l2f; leaves lance-linear; epikefl 



2040, near $' long, deflexed ; ppkl. (a) 2-flwd., abortive fl. 1-awned. 2( M., W. Jl. 



2 B. hirsuta Lag. Culms tufted, If; leaves at base lance-linear, flat; spikes 13; 



glumes (6) glandular-hispid, shorter than the 3 awns of the smooth (d) sterile flower. 

 (D Sandy soils, Wis., and S. 



3 B. ollgostacltya (N.) Culm filiform, 612' ; Ivs. at base subulate-setaceous ; gl. 



and lower pale downy, equaling the 3 awns of the villous ster. fl. y. Wis., and W. 



67. CTENIUM, Fanner. TOOTH-ACHE G- 



Spkl. (b) 4^5-fiwd., closely imbricated on one side 



of a flat rachis, middle fl. 5? , the upper and lower 



sterile. Upper gl. exterior, with an awnecl tubercle 



on the back. Lower 2 pale awned near the apex, 



silky-fringed below. Spike solitary, recurved. 



C. aromatic um (Ell.) Culm rigidly erect, 3 5f ; leaves' 



involute-setaceous above ; scorpoid spike (a) 46', very dense, the short, stout, di 

 var. awns arranged in 3 rows, it Sandy swamps, Va., and S. Curious. Herb. pung. 



68. TRIPSACUM, L. SESAME G. Spikes $ above, 5 

 below. Gl. coriaceous. $ Spkl. 2-flwd., inner fl. neuter. ? 

 Spkl. 2-flwd., the lower abortive. Outer gl. covering the fls. 

 in a cavity of the thick-jointed rachis, with an aperture each 1 

 side at base. 



T. dactyloides L. Culm solid with pith, 4 6f, stout; Ivs. broad and 

 flat; spikes (58') 2 or 3 together at top, and solitary in the sheaths, 

 sometimes, in 



ft. monost&chyon, solitary at the top also, il Banks and shores, 

 Penn. to 111. 



69. ZEA, L. INDIAN CORN. <? Fls. awnless. 

 $ Fls. in a terminal panicle of racemes ; spkl. (a) 

 2-flwd. $ Fls. embedded in the thick axillary 

 spadix (cob), which is enveloped in many bracts 

 (husks) ; spikelets (b) 2-flowered, 1 fertile. Glumes 

 roundish. Pistil thread-form (silk), very long, 

 green. (T) Culm solid. 



Z. Mays L. Culm stout, erect, 5 15f, smooth, with many 

 ample lin. -lanceolate Ivs. Native of S. Am. Cultivated 

 in many varieties. Grain always in even 8 24 rows in 

 the ear, golden yellow, varying to br. -purple or pearl- wh. 

 ft. JATONICA. Leaves variegated with 

 stripes of white and green. Gardens. 



70. ROTTBGBLLIA, Br. RAT-TAIL G. Spkl. in pairs at I 

 each joint of a terete spike, one sessile in a cavity of the rachis, Kill 

 2 ihvd., the other pedicelled, abortive. Lower fl. of the sessile 

 spkl. abortive. Gl. 2, subequal, the outer concave, coriaceous. Pales 

 hyaline. 24. Spikes pedunculate. Culm solid. 



1 R. cyliiidrica (Mx.) Porlicellate ppkl. a minute rudiment; 5 glume ovate 

 acute, obscurely impresfcd-tlottcd in linen ; fpike? cylimiric, cltndcr, finale 



