Dec. 1896. Flora of Yucatan — Mili.spaugh. 289 



than the others, 5- to 7-nerved; second glume a Httle shorter 

 than the third, 11- to 13-nerved, ver}' broadly ovate, cordate or 

 auriculate at the base, obtuse ; third glume narrower and a little 

 longer than the second, ii-nerved, somewhat lyreshaped at the 

 base, the margins becoming somewhat coriaceous at maturity, 

 palea short, hj'aline; fourth or uppermost glume ovate, apiculate 

 or short mucronate pointed, striate or transversely rugose; palea 

 similar in texture to the glume. Stamens three; stigmas plu- 

 mose. — Annuals with rather slender, branching culms, flat 

 leaves. Primar}' and secondary branches of the narrow sub- 

 spicate terminal panicles prolonged be)'Ond the spikelets into 

 slender awn -like bristles. Species 2, Mexico and Central 

 America. 



The awn-like prolongation of the branches in this genus is a 

 character which is not uncommon in the genus Panicuin, particu- 

 larly in the section Ptychophyllum, and the conformation of the 

 glumes suggests a relationship with P. gibbinn Ell. From Setaria 

 this genus is distinguished by the awns which subtend the spike- 

 lets being only prolongations of the supporting branches, the 

 many-nerved outer glumes, the peculiar formation or shape of 

 the third glume and the distinctly apiculate or mucronate-pointed 

 fourth glume. 



Setariopsis auriculata (Fourn.) Scribn. nom. nov. 



Setaria auriculata Fourn. iMex. Plant. Enum., Gram. 43. 

 Setaria pauciseta \'asey Bull. Torr. Bot. Club, XIII, p. 230. 



Culms slender. i to 2 feet high, branching below, slightly 

 compressed, pubescent at the nodes with appressed hairs, other- 

 wise smooth ; sheaths striate compressed, smooth or minutely 

 strigose-pubescent, ciliate on the margins and pubescent at the 

 apex; ligule a short string of hairs, leaf. blade lanceolate, 5 to 7 

 inches long, 2 to 6 lines wide, long-acuminate-pointed and 

 tapering towards the base, minutely pubescent on both surfaces, 

 becoming smooth with age. Panicle 3 to 5 inches long, the 

 primary branches .25 to i inch long, scabrous as are the main 

 axis and pedicels, the awn-like continuations of the branches 3 

 to 6 lines long. Spikelets 1.5 line long, very short pedicelled, 

 fruiting glume nearl}^ one-fourth shorter than the second and 

 third glumes, transversely rugose. Common on old fields about 

 Izamal, Sept. (849). A-o. ^92 A. Schott (1865); Alamosa, Mexico 

 (684 E. Palmer, 1880); Southwestern Chihuahua, Mexico (jS E. 

 Palmer, 1885); Oaxaca, Mexico, vicinity of Cuicatlan, alt. 1,800 

 to 2,500 feet {Nos. 1601, lyoi E. W. Nelson, 1894). The num- 

 bers here cited are in the National Herbarium. 



[Setariopsis latiglumis (Vase}') Scribn. nom. nov. (Plate XI). 



Setaria /(i'//X'-///w/j-\"asey Bull. Torr. Bot. Club, XIII, 229(1886). 



Similar in habit to S. auriculata, but more slender, with smooth 

 or very minutely scabrous leaves, narrower and more densel}?- 

 flowered panicles, whose main axis and branches are rather 

 densely papillate-pilose. The spikelets are larger (2 lines long), 



