FEB. 1903. PLANTS YUCATAN^E MILLSPAUGH & CHASE. 



shorter, hyaline, 2-nerved; floral glume about equal and similar, sub- 

 tending a minute hyaline palea. Grain pinkish white, broad ovoid, 

 9x1 mm.; in section plano-convex; endosperm oily. 



Hab. San Felipe, " 18 inches, common," Gaumer 1404, Poco- 

 boch, 2378, Chichankanab, 2465. 



ANDROPOGON L. Sp. PI. 1045. 



Inflorescence of spike-like racemes. Spikelets heterogamous, in 

 pairs at each joint of the articulate rachis, one sessile, perfect, 

 i -flowered, the other pedicellate and either staminate, neuter, or 

 reduced to the pedicel. Glumes of the perfect spikelet 4; first indur- 

 ated, flattened dorsally, with a strong nerve near each margin; floral 

 glume hyaline, awned, palea hyaline, minute or wanting. Grain 

 elongated. Stamens 3. 



Spikelets awned: 

 Clothed with soft hair 

 Hairy only at base 



Spikelets awnless 



hirtiflorus. 

 semiberbis. 

 Nardus. 



Andropogon hirtiflorus (Nees) Kunth. Rev. Gram. 2:569. 



Schizachrium hirtiflorum Nees. 



Racemes single, 4-5 cm. long, on glabrous included peduncles. 

 Internodes of rachis 6 mm. long, purple, clavate, with a toothed cup- 

 like appendage at the apex, 

 densely silky pilose. Neuter 

 spikelet consisting of a green, 

 3-hispid-nerved, slender awned 

 glume enclosing a hyaline 

 i-nerved empty glume; pedicel 

 shorter than sessile spikelet, 

 silky pilose. Perfect spikelet 

 elliptic, 7 mm. long, with a ring 

 of white hairs at the base. 

 First glume purplish, bidentate, 

 5-nerved, the lateral pair strong- 

 est and hispid above, densely 

 pilose; second equal in length, 

 scabrous, light brown with a 

 green, hispid keel; third purple, 

 hyaline, 2-nerved, ciliolate; 

 floral glume nearly equal in length, ciliolate, cleft ^i its length, 

 bearing a scabrous, geniculate awn, 12-13 rn'm. long; palea want- 

 ing. Grain purple, lanceolate-ellipsoid; tipped with the style base, 

 .6x4.5 mm.; in section, depressed sub-orbicular. 



Hab. In old fields, 3 feet high, Tekax, Sept. 1895-96, Gaumer 

 H34- 



Andropogon semiberbis (Nees) Kunth. Enum. 1:489. 



Schizachrium semiberbe Nees. 



Racemes single, 4-6 cm. long, on slender glabrous included 

 peduncles. Internodes of rachis 8 mm. long, tinged with red, clavate, 

 with a toothed cup-like appendage at the apex; a ring of white hairs. 



