454 POACR/E. 



tc'iuliiij? into very long firm awns, which arc sometimes twisted. 

 Short hmceohitc liyuliiie lobes, eacli side the central awn and out- 

 side of each lateral jiwn; palea linn, narrow. Styles distinct, elon- 

 gated, stigmas shortly plumose. 



Tufted or creeping perennials, the culms stoloniferous. They 

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

 sexes so different in a.spe(!t that without positive evidence it would 

 have been diflicult to sui)pose them to belong to the same plant. 



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

 or Texas. 



1. S. Karwinskianus (Fourn.) Benth. S. Wats. I'roc. Am. 

 Acad. 18: 181 (188;)). fjCsounUa Karwhiskiano Fourn. Bull. 

 Soc. Bot. Fr. :37:10^ (1880). 



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

 ous, ligule a mere ring, ciliate; blades firm, glaucons, sparsely i)u- 

 l)escent, 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 stamiiuite ones; floral 

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

 ones shorter, the longest 0-10 cm. long. 



New ^lexico, Vasen 557 for U. S. Dept. Agricul. ; Arizona, 

 Prinyle. 



Texas to Arizona and Mexico. 



101. (213). MoNANTHOCHLOE Engclm. Traus. St. Louis Acad. 

 1:430, //. 13, 14./. 18-27 (185!»). 



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

 single or clustered, almost hidden by the leafy bracts. Emi)ty 

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

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

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

 CJrain narrowly oblong, subtriquetrous, enclosed by the palea, but 

 not adherent. 



A creeping or stoloniferous grass, with crowded distichous leaves 

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

 found in Texas and Mexico. 



