411 

 OBAMHTEAE. 



Ann or per herbs of various habit, 



rarely shrubs or trees. Sts [culms] 



com hollow or sometimes solid, the 



nodes closed. Lvs sheathing, the 



sheaths com split to base on side opp 



blade, a scarious or cartilaginous 



ring [ligulc] borne at base of leaf- 



blade. Infl spicate, racemose or 



paniculate, consisting of spikelets of 



2-many 2-ranked imbricated bracts 



[glumes], the 2 lowest in the com- 



plete spikelet always empty, one or 



both sometimes 0:^1 or more of the 



upper glumes com contains in axil a 



fl, which is com inclosed by a bract- 



like awnless organ called the palea, 



placed opp the glume with its back 



eto th axis [racnilla] of the spikelet, 



com 2-keeled : fls perfect or stam, 



sometimes mon or dioe, subtended 



by 1-3. c >m; "2, minute hyaline scales 



[lodicules] placed nt base of ova opp 



palea: sta 1-0, C"in o: auth 2-celled, 



versatile longitudinally dehiscent. 



Ova 1 -celled. 1-ovuled: sty 1-3, com 



2 & Interal; stig hairy or plumose: 



ifr a sd-Kke grain [c >ryopsis]; endo- 



spermstan-ny. urass Family. 



cu=:culms, the stem of grasses or 



sedges. 



dioe=:dioecious, fls of different sexes 



borne by separate plants, unisexual. 



gm=glTunes ? floral bracts in grasses. 



monrrmonoecious, having sta or pistils 



only. 



nar=narrow. 



rach=racliilla. 



spkrr spike, resembling a raceme, but fls 



sessile or nearly so. 



spkt = spikelet, a secondary spike; in 



grasses, the fls subtended by a common 



pair of glumes. 



c rrfeet. '^inches. "=lines. 



Tribe MAYDEAE. Infl mon. spicate, 



stam and pist spks distinct on different 



part of plant or connected; when con- 



nected stam fls occupying upper portion 



of spk or spks, pist fls the lower part. 



COIX L, Gen, ed 1, 280 (1737). 



Jobs' tears; cult. China, India. 

 ZZA L, Gen, ed 1,279 (1737). 

 Z. MATS L sp pi 971. Paraguay. Maize 

 or Indian Corn; cult. 

 TRIPSACUM L, syst, ed 10, 1261 (1759). 



Fls in jointed spks, upper part stam, 

 lower pist; upper sessile, in pairs at 

 each joint of the triangular rachis; each 



412 



spkt with 2 membraneceous male fls, 

 outer gm conaceous or rigid: pist spkt 

 single, embedded in joints of the thick- 

 ened cartilaginous rachis, 2-fld, upper fl 

 fertile, lower neutral; outer empty gm 

 thickened and cartilaginous, inner much 

 thinner and pointed; flg gm and palets 

 thin and scarious. 

 T. Z.EMMON1 Vasey, CNH 3:6. Ar. 



Tribe ANDROPOGONE^E. Spkt 

 in spike-like racemes, 2 at each joint 

 of the rachis, 1 pedicellote & herm- 

 aphrodite, stam or rudimentary: gm 

 com 4, 1st *2d empty or with a stam 

 fl in its axil, rarely awned, 4th or flg 

 gm hyaline, com awued, awn com 

 twisted or geniculate. 



Inft composed of spike-like silky 



racemes. Andropogon. 

 Infl paniculate; spkt somewhat silky 



pubescent. Sorghum. 

 ANDROPOGON MACROURUS Mich. 



McClatchie. Erythea 2:77. Gabriel mta. 



Cantilles (Or 1144, 1163). 

 ANDROPOGON SACCHAROIDES Swtz. 



Baja (Or 514); Colo; Kansas. 

 ANDROPOGOX DISSITIFLORUS Mlchx 

 ANDROPOGON" CIRRHATUS Hackel. 

 ANDROPOGON HIRTIFLORUS Kth. 

 ANDROPOGON WRIGHTII Hackel. 

 Genus SOBGHTJM Pers. 



Ann or per grasses with Ig broad flat 

 Ivs and terminal ample panicles: spkt 

 in pairs at nodes, or in 3's at ends of 

 branches, 1 sessile and perfect, the lat- 

 eral pedicelled, stam or empty: sessile 

 spkt consisting of 4 gm outer indurated 

 and shining, obscurely nerved, inner 

 hyaline, 4th awned and subtending a 

 sm palea and perfect fi, or palea 0; sta 

 3: sty distinct: grain free. 

 SORGHUM HALAPENSE Pers. 

 Pers, Syn 1:101. Ab 21. 



Johnson-grass. Cu erect, 9-15 dm hi, 

 simple or sometimes much branched, 

 smooth; sheaths smooth; Ivs 2 dm Ig or 

 more, 7-25 mm wide, Ig-acuminate; pan- 

 icle open, 15-45 cm Ig; branches com 

 whorled, spreading, naked towards base; 

 outer gms of sesile spkt 4-6 mm Ig, 

 ovate-lanceolate, com p'ish, pubescent 

 with Ig, appressed hairs; awn 8-16 mm 

 Ig. more or less bent, sometimes 0; pedi- 

 celled spkts of 4 gm, the outer 2 about 

 6 mm Ig, membranous, the inner 2 sh er 

 and nar'er, sometimes with stam fls. 



Tribe PANICE.E. Spkt herm- 

 aphrodite, terete or flattened on the 

 back: gm 3-4, rare 2, when 4 the 3d 

 com includes a si-am fl in axil; flg 

 gm firmer in texture than outer 

 ones: axis of iufl not articulated, the 

 rach being articulated below empty 

 gm & spkt deci^i singly from pedicels. 



A. spkt not surrounded by a bristly or 



