454 POACE.E. 



tending into very long firm awns, which are sometimes twisted. 

 Short lanceolate hyaline lobes, each side the central awn and out- 

 side of each lateral awn; palea firm, narrow. Styles distinct, elon- 

 gated, stigmas shortly plumose. 



Tufted or creeping perennials, the culms stoloniferous. They 

 are all remarkable for the unisexual spikelets, those of the two 

 sexes so different in aspect that Avithout jjositive evidence it would 

 have been difficult to suppose them to belong to the same jilant. 



There are four species, one found in Chili, the others in Mexico 

 or Texas. 



1. S. Karwinskianus (Fourn.) Benth. S. AYats. Proc. Am. 

 Acad. 18:181 (1883). Lcsoiirdia KarivinsTciana Fourn. Bull. 

 Soc. Bot. Fr. 27:102 (1880). 



Culms solid, 15-25 cm. high. Leaves of sterile shoots numer- 

 ous, ligule a mere ring, ciliate; blades firm, glaucous, sparsely pu- 

 bescent, flat or conduplicate, 1-3 cm. long, those of the culm 2-3^ 

 in number, and usually less than 5 cm, long. Staminate spikelets 

 about 15-flowered, 3-4 cm. long; floral glume 7-8 mm. long; 

 pistillate spikelets about the length of the staminate ones; floral 

 glume linear, 10 mm. long, the twisted awns equal or the lateral 

 ones shorter, the longest 6-10 cm. long. 



New Mexico, Vasey 557 for U. S. Dept. Agricul. ; Arizona, 

 Pringle. 



Texas to Arizona and Mexico. 



101. (213). MoNANTHOCHLOE Engelm. Trans. St. Louis Acad. 

 1:436, tt. 13, 14,/. 18-27 (1859). 



Spikelets unisexual, slightly dissimilar, 2- or rarely 3-flowered^ 

 single or clustered, almost hidden by the leafy bracts. Empty 

 glumes firm, similar to the distichous leafy bracts; floral glume 

 firm, obtuse or denticulate, covering the 2-nerved palea and the 

 flower. Stamens 3. Styles distinct, long, clothed with short hairs. 

 Grain narrowly ol)long, subtriquetrous, enclosed by the palea, but 

 not adherent. 



A creeping or stoloniferous grass, with crowded distichous leaves 

 0.5-10 mm. long, including the sheath. There is one species 

 found in Texas and Mexico. 



