282 



Xyridaceae 



Wolffiella 



50 



Map 583 



Wolf f la columbiana Karst. 



Miles 

 56 



Map 584 



Wolffia punctata Griseb. 



1. Wolffia columbiana Karst. COMMON WOLFFIA. Map 583. Locally very 

 abundant in permanently stagnant waters that abound in organic debris. 



Mass., N. Y., Mich, to Minn., southw. to Fla., La., and Tex.; also in 

 Mex., Cent. Amer., and S. A. 



2. Wolffia papulifera Thompson. Pointed Wolffia. Found in isolated 

 small colonies in permanent pools of stagnant water rich in organic matter. 

 Known in Indiana only from Posey County. It has been found in only 

 eight states. 



Ohio, Ind., 111., Ky., Tenn., Mo., Ark., and Kans. 



3. Wolffia punctata Griseb. Dotted Wolffia. Map 584. Locally abun- 

 dant in the habitats of the genus. 



Conn., N. Y., Mich, to Minn., southw. to La. and Tex. 



796A. WOLFFIELLA Hegelmaier 



1. Wolffiella floridana (J. D. Smith) Thompson. STAR WOLFFIELLA. Map 

 585. Restricted to wholly stagnant bodies of water and very local in the 

 northern range of its distribution. 



Ont., Mich., Wis., and Mo., southw. to Fla., La., and Tex.; also in Mex. 



29. XYRIDACEAE Lindl. Yellow-eyed Grass Family 



826. XYRIS [Gronov.] L. Yellow-eyed Grass 



Base of plant bulbous; lateral sepals wingless, the keel ciliate 1. X. torta. 



Base of plant not bulbous; lateral sepals winged, the keel winged and erose above the 

 middle 2. X. caroliniana. 



1. Xyris torta J. E. Smith. (Xyris flexuosa Muhl.) Map 586. Local in 

 the northwestern part of the state in moist, sandy soil about lakes and 

 in prairie habitats and fallow fields. 



Maine to Minn., southw. to Ga. and Mo. 



2. Xyris caroliniana Walt. Map 587. In the moist, sandy borders of 

 lakes, sloughs, and marshes. This species is very local. The fact that a 

 few plants were found on the border of a small lake in Wells County 



