The Flora of the Cayuga Lake Basin 277 



1. D. nudiflorum (L.) DC. 



Dry open sandy or gravelly woods, in acid soils ; frequent. July 20-Aug. 



On the hills w., s., and s. e. of Ithaca, on the ravine crests, and probably in the 

 sandy soils n. of Cayuga Lake: Thatcher Pinnacles; Key Hill; s. w. corner of 

 Cayuga Lake ; Cascadilla woods ; Beebe Lake ; above Forest Home ; and elsewhere. 

 Absent in the McLean district and on the clays and richer soils back from the lake 

 shores. 



Me. to Minn., southw. to Fla., La., and Ark., including the Coastal Plain. 



2. D. grandiflorum (Walt.) DC. (D. acuminatum of Cayuga Fl.) 



Rather dry open woods, in rich gravelly and clayey, neutral or somewhat cal- 

 careous, soils; more frequent than the preceding. July 1-Aug. 15. 



Mostly wanting in the chestnut and ericaceous forests of the higher hills of the 

 basin ; frequent in the outwash and delta gravels : upper Six Mile Creek ; Cascadilla 

 woods ; Beebe Lake ; Mud Creek, Freeville ; s. of Glenwood ; Shurger Glen ; and 

 elsewhere. 



Me. to S. Dak., southw. to Fla., Ala., Kans., and Okla. ; less common on the 

 Coastal Plain. 



3. D. rotundifolium (Michx.) DC. 



Dry sandy or gravelly exposed banks and borders of woods, in noncalcareous 

 soils ; scarce. Aug. 



Distribution similar to that of D. nudiflorum: White Church (D.) ; Thatcher 

 Pinnacles (D.) ; s. side of Coy Glen; s. w. corner of Cayuga Lake; Cascadilla 

 woods; Fall Creek; Turkey Hill; Junius (Sartzccll, D.\) ; Duck Lake; and else- 

 where. 



E. Mass. to Minn., southw. to Fla., La., and Mo., including the Coastal Plain. 



4. D. bracteosum (Michx.) DC. (D. cuspidatum of Cayuga Fl.) 



Borders of dry woods, in rich sandy noncalcareous loams ; infrequent. Aug. 



White Church ; Enfield Glen ; Coy Glen ; s. w. corner of Cayuga Lake ; Cas- 

 cadilla woods (D.) ; Fall Creek, above Forest Home; Paine Creek; and elsewhere. 



S. Me. (?) and N. H. to Minn., southw. to Fla., Mo., and Tex.; rare on the 

 Coastal Plain. 



5. D. Dillenii Darl. 



Ravines and dry woodlands, in sandy or gravelly noncalcareous soils ; frequent. 

 Aug. 



Distribution similar to that of D. nudiflorum, but occurring usually in less sterile 

 soil : Enfield Glen ; Cayuga Heights ; Beebe Lake ; e. of Forest Home ; and else- 

 where. 



Cent. Me. to Minn., southw. to Ala., Tenn., and Mo. ; less frequent on the Coastal 

 Plain. 



This species hybridizes freely with D. canadense. The hybrids usually have leaves 

 more like those of D. canadense, and the pubescence of the stem is villous rather 

 than granular-scabrous. The joints of the loment in the hybrid are also less 

 unequal-sided. 



6. D. paniculatum (L.) DC. 



Dry open sandy woodlands, in noncalcareous soils ; frequent. Aug. 10-30. 

 Distribution similar to that of D. nudiflorum : Enfield Glen ; Coy Glen ; woods 

 s. and w. of Glenwood ; Beebe Lake ; and elsewhere. 



S. Me. to Minn., southw. to Fla. and Tex., including the Coastal Plain. 



