Linum 



Zygophyllaceae 



631 



50 



Map 1305 



Zanthoxylum amencanum Mill 



50 



Map 1306 



Ptelea trifoliata L 



Coastal Plain from N. C. to Fla., Miss., and up the Mississippi Valley to 

 s. 111., and up the Kankakee Valley to nw. Ind. 



3. Linum virginianum L. Map 1302. Infrequent in open places on the 

 crests and slopes of black and white oak and chestnut oak ridges in the 

 southern part of the state ; in prairie habitats in the northern part of the 

 state; and in dry, open, white oak and white and black oak woods else- 

 where. 



Maine to Ont., southw. to Ga. and Ala. 



4. Linum striatum Walt. Map 1303. Our specimens are from mediacid, 

 hard, white clay soil in low, beech and sweet gum woods, one from a 

 wooded slope, and one from the border of an interdunal flat. Rare. 



Mass. to Fla., Ky., Mo., and Tex. 



5. Linum medium (Planch.) Trel. var. texanum (Planch.) Fern. (Rho- 

 dora 37: 428. 1935.) (Linum medium (Planch.) Britt. of Gray, Man., ed. 

 7 and Cathartolinum medium (Planch.) Small of Britton and Brown, Illus. 

 Flora, ed. 2.) Map 1304. In southern Indiana this plant has been found 

 on washed slopes in fallow fields, on post oak ridges, and in moist, hard 

 clay soil on post oak flats. In the northern part of the state it is found in 

 the prairies and lake areas in moist, sandy soil, usually associated with 

 Cladium mariscoides, J uncus Torreyi, Liatris spicata, etc. Rare. 



My specimens no. 41481 from Brown County may belong to the typical 

 form. They are rather small and I hesitate to refer them to the typical 

 form for fear they are only extremes of the variety. 



Sw. Maine, s. Mich., and 111., southw. to Fla. and Tex. 



135. ZYGOPHYLLACEAE Lindl. Caltrop Family 



3978. TRlBULUS [Tourn.] L. 

 See excluded species no. 415, p. 1069. 



