ORDER 155. GRAMINE^E. 



409 



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



2040, near *' long, deflexed ; spkl. (a) 2-flwd., abortive fl. 1-awned. U M., W. 31. 



2 B. liirsuta 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. 

 Sandy soils, Wis., and S. 



3 B. oligostaeliya. (N.) Cnlm filiform, 6 12'; IVP. at base subulate-setaceous ; gl. 



and lower pale downy, equaling the 3 awns of the villous ster. fl. u 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. $ , 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. aromaticum (Ell.) Culm rigidly erect, 3 5f; leaves 



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

 var. awn? arranged in 3 rows. 71 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 

 side at base. 



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

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

 sometimes, in 



/3. mono*tach>jon, solitary at the top also. U Banks and shores, 

 Penn. to 111. 



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

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

 2-flwd. 2 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-forhi (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 824 rows in 

 the ear, goldeii yellow, varying to br.-pnrple or pearl-wh. 

 B. JAPONICA. Leaves variegated with 



stripes of white and green. Gardens. 



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

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

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

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

 hyaline, u Spikes pedunculate. Culm solid. ( 



1 R* cyliiidrlca (Mx.) Pedicellate spkl. a minute rudiment; 5 glume ovate. 

 acnU:, obscurely irnpressed-dotted in lines ; spikes cylindric, slender, single : 



