756 



Gentianaceae 



Barton ia 



50 



Map 1622 



Gentiana cnnita Froel. 



and in this habitat it reaches its greatest size. It is also infrequently 

 found on exposed open places on the crests or slopes of wooded ridges. 

 N. Y. to Ont. and Mich., southw. to Fla. and La. 



2. Sabatia campanulata (L.) Torr. var. gracilis (Michx.) Fern. (Rho- 

 dora39:444. 1937.) (Sabatia gracilis (Michx.) Salisb.) Map 1619. Our 

 only specimens were found in a small colony in rather acid soil in a low, 

 sandy flat in a woods 4 miles north of Washington, Daviess County. Here 

 it was closely associated with Betula nigra, Spiraea tomentosa, Viola 

 lanceolata, Viola sagittata, Rhexia mariana var. leiosperma, Rhexia vir- 

 ginica, Linum medium var. texanum, and Hieracium Gronovii. 



Nantucket, Mass. to Fla. and west to La. in salt marshes and brackish 

 swamps, rarely inland in fresh-water swamps ; also on the summits of the 

 southern Alleghenies; Bahamas; Cuba. 



6496. CENTAURIUM Hill 

 See excluded species nos. 495 and 496, p. 1080. 



6501. BARTONIA Muhl. 



1. Bartonia virginica (L.) BSP. Map 1620. Infrequent in the lake 

 area and very rare south of it. Usually found in clumps of sphagnum in 

 bogs and more rarely in moist habitats in very sandy, minimacid soil in 

 open places in black and white oak woods, growing in moss with Poly gala 

 cruciata, Gaultheria procumbens, and Aronia melanocarpa. 



The petals vary in color from greenish yellow to yellow or rose purple. 



N. S. to Minn., southw. to Fla. and La. 



6502. OBOLARIA L. 



1. Obolaria virginica L. PENNYWORT. Map 1621. This very incon- 

 spicuous plant is usually rare and only a few specimens are found in a 

 colony. It is sometimes frequent, however, and on April 26, 1927, I found 

 it to be a common plant in a small field on a wooded slope in Harrison 



