ORDER 155. GRAMINE^E. 



40U 



1 B. curtipendula (Mx.) (c) Culm ascending, 1 2f; leaves lance-linear ; ppikcp 



20-^tO, near J' long, deflexed ; spkl. (a) 2-flwd., abortive fl. 1-awned. if M., W. JL 



2 O. hirsfita Lag. Culms tufted, If; leaves at base lance-linear, flat; spikes 1 3; 



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

 Sandy soils, Wis., and S. 



3 B. ollgostacliya (N.) Culm filiform, 6 12'; Ivs. at base subulate-setaceous; gl. 



and lower pale downy, equaling the 3 awns of the villous ster. fl. 2 Wis., and W. 



67. CTENIUM, Fanner. TOOTH-ACHE G- 

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

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

 sterile. Upper gl. exterior, with an awned tubercle 

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

 silky-fringed below. Spike solitary, recurved. 



C. aroiniitlciim (Ell.) Culm rigidly erect, 3 5f; leaves? 



involute-setaceous above; scorpoid spike (a) 4 6', very dense, the short, stout, di- 

 var. awns arranged in 3 rows. 21 Sandy swamps, Va., and S. Curious. Herb. pnng. 



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

 below. Gl. coriaceous. S 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 

 side at base. 



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

 Hat ; spikes (5 8') 2 or 3 together at top, and solitary in the sheaths, 

 sometimes, in 



imiiirliifun, solitary at the top also. 2J Banks and shores, 



0. 



Penn. to 111. 



69. ZEA, L. INDIAN CORN. 8 Fls. awnless. 

 S Fls. in a terminal p;micle 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. @ Culm solid. 



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

 ample tin. -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 

 jS. JAP6NICA. Leaves variegated with 

 stripes of white and green. Gardens. 



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

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

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

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



hyaline. 



1 



24. Spikes pedunculate. Culm solid. 



I. cylindrical (Mx.) Pedicellate spkl. a minute rudiment; 

 acute, obscurely impressed-dotted in lines ; spikes cylindric, 



! glume ovriti 

 'lender, fiin,l<' 



