FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



glume 2.4 mm., naviculate with a short cuspidate point, hispid on the 

 prominent, green-bordered keel; second glume 2 mm. (excluding 



point), broad, truncate or emarginate, 

 the hispid keel extended into a cuspi- 

 date point 1.3 mm. long; floral glume 

 3 mm., naviculate, the prominent 

 green-bordered, hispid keel extended 

 into a cuspidate point which in the 

 lower floret is inflexed at the tip, in 

 the second the point is usually straight; 

 palea 2.3 mm., broad acute, deeply 

 folded between the ciliate - winged 

 nerves. Grain light reddish brown, 

 broadly oblong, transversely wrinkled, 

 5-.8x.9 mm.; in section conoid, with 

 a concave ventrum. 

 Hab. Merida, Aug. 20 to Sept. 5, 1865, Schott 734; Progreso, 

 Gaumer 150^1 Izamal 2iji. 



LEPTOCHLOA Beauv. Agrost. 71, t. 15, f. 1. 



Spikelets several flowered, perfect, short-pediceled, in two rows 

 along one side of the slender numerous branches of a simple panicle,, 

 rachilla articulated above the empty glumes and between the florets. 

 Glumes compressed, keeled, thin, first and second empty. Grain 

 sub-trilateral, free. Stamens 3. 



Spikelets 3-3.5 mm., floral glume entire, awnless mucronata. 



Spikelets 8-9 mm., floral glume bidentate, awned fascicularis. 



Leptochloa mucronata (Michx. ) Kunth Gram. 1:91. 



Eleusine mucronata Michx. 



Inflorescence included at the base or finally exserted, 25-40 cm. 

 long, 5-10 cm. wide, comprising 25-40 very slender, racemed, ascend- 

 ing spikes, 6-15 cm. long, 2-3 mm. wide, of 

 30-50 alternate, spreading Spikelets; rachis 

 slightly zigzag, angled, hispidulous, inter- 

 nodes i. 5-2 mm. Spikelets 1.5x3.2 mm., 

 compressed, loosely 4-5-flowered, on short 

 scabrous pedicels, rachilla smooth, flexu- 

 ous, joints .5 mm. First and second 

 glumes subequal 1.8-2 mm., linear-lanceo- 

 late, acute, mucronate- tipped, hispid on 

 the keel; floral glume 1.3-1.5 mm., ovate, 

 obtuse or emarginate, 3-nerved, silky cili- 

 ate on the nerves; palea 1.3 mm., oblong, 

 obtuse silky ciliate ' on the nerves; the 

 rachilla produced in a short point at the 

 back of the terminal (staminate) floret. 

 Grain translucent reddish-brown, lanceolate, smooth, . 25--4X i.i mm.: 

 in section narrowly cordate. 



Hab. Environs of Merida, May, 1865, Schott 401; July, 1865, 

 590; Nov., 1865, 7Jp; common in old fields about Izamal, 3 feet high, 



