4 o 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



divisions attenuate, interlocked, pubescent, green-nerved toward' 



the apex; spines 3-6 mm. long, retrorsely barbed; basal bristles 



filiform, scabrous. Spikelets 2-3. 

 in each involucre, the tips exserted, 

 1.6x5 mm. ovate-lanceolate,, 

 acute. First glume wanting, sec- 

 ond over y z the length of the 

 spikelet, ovate, acute, 3-nerved, 

 puberulent; third nearly as long 

 as the spikelet, acute, 3-nerved, 

 internerves puberulent, the en- 

 closed palea minute or wanting: 

 fruiting glumes 1.5x5 mm. ovate- 

 lanceolate, acuminate, the glume 

 5-nerved, palea glabrous. Grain 

 pale stramineous, oval, 1.15x1.9 

 mm. ; in section convexo-concave. 

 Hab. Chichankanab, Gau- 

 nter 2170; east shore of Island of 



Cozumel, Millspaugh PL Utowana ^S99> an d arid plains south of Pro- 



greso, 1682. 



Cenchrus pallidus Fourn. Mex. PL Enum. Gram. 50 



Spikes exserted, 2.57 cm. long, of 10-50 (sometimes more) 

 crowded involucres, 13 x 15 mm., including bristles, on pilose pedicels;, 

 the 78 divisions attenuate, 

 interlocked, pubescent, ciliate 

 below, barbulate at the apex; 

 spines 6-12 mm. long, purplish, 

 antrorsely barbed; basal bristles 

 numerous, slender, minutely 

 barbed. Spikelets 2-3 in each 

 involucre, 1.5x5 mm., ovate- 

 lanceolate, acuminate. First 

 glume wanting, second over y z 

 the length of the spikelet, pur- 

 plish brown,, ovate, acute, 

 3-nerved, puberulent; third ^ 

 the length of the spikelet, pur- 

 plishbrown, acute, 5-nerved, pu- 

 berulent except near the mar- 

 gins below, subtending a brown, 

 scabrous, 2-nerved palea nearly its own length; fruiting glumes 1.5x5 

 mm. , ovate-lanceolate, acuminate, the glume 5-nerved, nerves scabrous 

 above ; palea puberulent between the two nerves. Grain pale stramine- 

 ous, broadly oval, apiculate,i.5 x2.i mm. ; in section convexo-concave. 

 Hab. Merida, July 27, 1865, Schott 498 in part, July 2-Aug. 27, 

 1865, 596; crevices in rocks on the patio of Dr. Gaumer, Izamal, Jan. 

 13, 1895, Millspaugh, Armour Exped. 70; Izamal, Gaumer 2493, Chi- 

 chankanab 2326. 



Called MOOL, "claw-grass," by the Mayas. 



