20 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



at the base, otherwise glabrous. Neuter spikelet reduced to a 



5 nerved, scabrous, awned glume on a broad ciliate pedicel shorter 



than the sessile spikelet. 

 Perfect spikelet lanceolate, 8 mm. 

 long, with a ring of short white 

 hairs at its base. First glume 

 brown, bidentate, 2-nerved, sca- 

 brous, nerves hispid above; sec- 

 ond equal in length, brown, acute, 

 keeled, scabrous, ciliate; third 

 white, hyaline, 2-nerved, ciliate; 

 floral glume ^ the length of 

 first, cleft 2 /$ its length, bear- 

 ing a scabrous geniculate awn, 

 15-18 mm. long; palea wanting. 

 Grain light brown, translucent, 

 lanceolate-ellipsoid, .7x3.9 mm. ; 

 in section compressed sub-orbic- 

 ular. 



Hab. "Abundant on stone 



walls, house roofs and on the ancient ruins about Izamal, rare in 



fields, 2 feet high," Nov., Gaunter 1037. 



Andropogon Nardus L. Sp. PI. 1482. 



Racemes 1-1.5 cm - m pairs, terminal upon the culm or its 

 branches, one sessile, with one or two basal homogamous pairs (of 2 

 staminate spikelets), the other short pediceled, both subtended by a 

 red-brown sheathing leaf 1.5-2 cm. long, arranged in a false panicle 

 interrupted by leaves. Internodes of 

 rachis 2 mm., clavate, with a toothed 

 cup-like summit, densely pilose with 

 rather stiff white hairs, 1-2 mm. long. 

 Staminate spikelet 4.5 mm., russet 

 brown, lanceolate; first glume, sca- 

 brous, g-nerved; second glume nearly 

 equal, 3-nerved; -floral glume 3.5 mm., 

 linear lanceolate, hyaline, subtend- 

 ing a staminate flower without palea. 

 Perfect spikelet 5-5.3 mm., light 

 brown, lanceolate; first glume acute, 



scabrous, the 2 nerves winged; second equal, acute, i-nerved; third 

 3.5 mm., white, hyaline, i-nerved, scabrous; floral glume 3 mm., linear, 

 hyaline, awnless; palea wanting. Grain not seen. 



Hab. Cultivated, Hacienda San Rafael Xteppen, Aug. 7, 1865 

 (lacking inflorescence), Schott 547 ; " Cultivated at Merida on account 

 of its pleasant odor, and used in Yucatec domestic medicine as a tea 

 for stomachic colic," Valdez 43. 



SORGHUM Pers. Syn. 1:101. 



Inflorescence paniculate, racemes reduced to 1-4 joints, spike- 

 lets heterogamous, in pairs at each joint of the usually articulate 



