FEB. 1903. PLANTS YUCATANJE MILLSPAUGH & CHASE. 



PANICUM L. Sp. PI. 55. 



Inflorescence racemed or panicled. Spikelets i -flowered or 

 sometimes with a staminate flower below the terminal perfect one, 

 rachilla articulated below the empty glumes. Glumes 4, empty 

 glumes membranaceous, fruiting glumes coriaceous, the margins of 

 the glume inrolled over the palea. Grain dorsally compressed, 

 enclosed in the fruiting glumes, free. Stamens 3. 



Fruiting glumes smooth and shining: 

 Palea free at the summit: 



Spikelets awned crus-galli. 



Spikelets awnless colonum. 



Palea included at the summit: 



Spikelets 1.5 mm. pubescent brevifolium. 



Spikelets over 3.5 mm. glabrate or nearly so: 

 Obovate, empty glumes inflated divaricatum. 



Lanceolate, empty glumes not inflated: hir-ticaulum. 



Fruiting glumes transversely rugose: 



Oblong, blunt and pubescent at the summit maximum. 



Oval, acute and glabrate at the summit: 



Empty glumes hirsute Carthaginense. 



Empty glumes glabrate: 

 Russet or brown, internerves transversely ) f 



wrinkled yuscunt. 



Pale green, not wrinkled paspaloides. 



Panicum crus-galli L. Sp. PI. 56. 



Panicle finally exserted, of 6-8 approximate racemes; axis 7-10 



cm. long, flattened, hispidulous. Racemes erect, 1-2 cm. <long; rachis 



hispidulous. Spikelets crowded in 2 to 4 

 rows, 1.6x4 mm. exclusive of awn, pale 

 green, ^ovate- lanceolate, acuminate. 

 First glume -^ the length of spikelet, 

 mucronate, ciliolate, 3-nerved, hispid 

 on the nerves, glabrous between them; 

 second and third equal (exclusive of 

 awn), 5-nerved, bristly-hispid on the 

 nerves, internerves sparsely hispid 

 toward the apex, the second glume 

 mucronate or awn-tipped, the third bear- 

 ing an antrorsely barbed awn 3-10 mm. 

 long; fruiting glumes 1.3x3.5 mm., 

 stramineous, lanceolate, acuminate, 

 smooth and shining, minutely pubescent 

 at the summit, apex of palea not in- 

 cluded. Grain translucent pinkish white, 



oval with rounded apex, i x 1.5 mm.; in section convexo-concave. 



Hab. Borders of an aguada at Kanachen, March, 1866, Schott832. 



Panicum colonum L. Syst. Ed. 10, 870. 



Panicle exserted, of 4-12 racemes, axis 5-20 cm. long, glabrous or 

 hispidulous toward the summit. Racemes more or less spreading, . 5-3 

 cm. long; rachis flattened, hispidulous. Spikelets in pairs, one sessile 

 and one short-pediceled, 1.4x2.6 mm., russet-green, oval, short- 

 acuminate. First glume y z the length of the spikelet, 3-nerved, hispid; 



