45 2 XYRIDACEAE. VOL. I. 



4. Xyris communis Kvmth. Southern Yellow-eyed Grass. Fig. 1135. 



? Xyris macrocephala Vahl, Enum. 2 : 204. 1806. 

 Xyris communis Kunth, Enum. 4: 12. 1843. 

 Xyris difformis Chapm. Fl. S. States 500. 1860. 



Scapes slender, slightly twisted, 2-edged above, 

 i -edged below, not thickened at the base, 6'-i8' tall. 

 Leaves nearly linear or linear-lanceolate, flat, 3'-io' 

 long, I "-6" wide; head ovoid, or subglobose, blunt 

 or subacute, about \' long; scales ovate or oval, 

 mostly entire ; lateral sepals lanceolate, the winged 

 keel fimbriate from the apex to below the middle ; 

 corolla-lobes obovate, 2"-?," long. 



In bogs, Maryland to Florida and Louisiana. Widely 

 distributed in tropical America. June-Aug. 



5. Xyris elata Chapm. Tall Yellow-eyed 

 Grass. Fig. 1136. 



Xyris elata Chapm. Fl. S. States 501. 1860. 



Scapes rather stout, i-4i tall, solitary or several 

 together, 2-edged above. Leaves decidedly equi- 

 tant, linear or nearly so, 8'-24' long; head oblong 

 or nearly cylindric, 8"-i2" long; scales suborbicular, 

 numerous ; lateral sepals 2"-2$" long, the narrowly 

 winged keel toothed above the middle ; corolla- 

 lobes about 2" long. 



In sandy swamps near the coast, southeastern Vir- 

 ginia to Florida and Louisiana. July-Oct. 



6. Xyris Congdoni Small. Congdon's 

 Yellow-eyed Grass. Fig. 1137. 



Xyris Congdoni Small ; Britton, Man. Ed. 2, 1057. 1905. 



Scapes relatively stout, smooth, flattened above, 

 lJ-2$ tall. Leaves over one-half as long as the 

 scape, decidedly equitant, linear from a broad base 

 which is commonly over 5" wide; head oval or 

 nearly so, 6"-8" long; scales erose at the apex, less 

 concave than those of X. flexuosa; lateral sepals 

 3"-3$" long, the broad keel erose-lacerate above 

 the middle. 



On boggy shores, near the coast, often in water, east- 

 ern Massachusetts to New Jersey. July-Sept. 



