294 HARPER 



handsomer and stouter than the other, with broader and 

 straighter leaves, the bases of which when old finally split 

 up into fibers as in many species of Sisyrinchium. A micros- 

 copic examination of the leaf shows at once the reason for 

 this, and reveals certain differences in the form and arrange- 

 ment of the vascular bundles, but whether these characters 

 are constant enough to be of specific value I cannot say. It 

 has not been customary to separate species of grasses by 

 such minute leaf-characters, and furthermore it is not known 

 at present which of the two forms is the type of the species. 

 Both forms seem to flower at the same time, in August and 

 September, and I have seen specimens of both from other 

 states. 



The species is said to range from South Carolina to northeastern 

 Florida and Mexico. 



The leaf-anatomy, apparently of the moist pine-barren form, 

 has been described by Kearney in Contr. U. S. Nat. Herb. 

 5: 288. 1900. 



STIPA L., Sp. PI. 78. 1753. 

 S. avenacea L., 1. c. 



tattnall: Sandy west bank of Ohoopee River; wilcox: Upper 

 Seven Bluffs. Fl. April-May. More common in Middle 

 Georgia. 



New York to Missouri, Florida, and Texas. 



ARISTIDA L., Sp. PI., 82. 1753. 

 A. spiciformis Ell., Sk. 1: 141. 1816. 



Rather dry (intermediate) flat pine-barrens, and corresponding 

 places in sand-hills, appling, coffee {686), berrien, 

 colquitt, thomas. Fl. July-Sept. Never seen near the 

 escarpment or northwest of it, or northeast of the Altamaha 

 River, but common in all the counties east of those men- 

 tioned and south of the river, i.e., in the flat country around 

 Okefinokee Swamp. 



South Carolina (?) to central Florida and Mississippi, in the 

 pine-barrens. 



For a morphological note see Bull. Torrey Club 28: 464. 

 1901. 



