The Flora of the Cayuga Lake Basin 433 



5. H. venosum L. Rattlesnake-weed. 



Dry open woodlands of oak and chestnut, in gravelly or sandy acid soils ; fre- 

 quent. June-July 10. 



In the chestnut soils on the hills w., s., and s. e. of Ithaca, on the ravine crests 

 and the crests of the lake cliffs, and in the sandy soils n. of Cayuga Lake; rare or 

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

 shores. 



S. Me. to Man., southw. to Ga., Ky., and Nebr., including the Coastal Plain. 



6. H. paniculatum L. 



Dry open woodlands and thickets, in gravelly, nearly neutral, sterile soils, 

 apparently preferring slightly less acid soil than the last preceding species; frequent. 

 Aug.-Sept. 10.' 



S. side of Enfield Glen; Six Mile Creek; Forest Home path; West Hill; Ring- 

 wood ; hilltops s. of Dryden Lake ; region of McLean Bogs ; near Chicago Bog ; s. 

 side of Salmon Creek valley ; and elsewhere. 



N. S. and cent. Me. to Mich., southw. to Ga. and Ala., including the northern 

 Coastal Plain. 



7. H. scabrum Michx. 



Dry open woodlands and banks, in sterile gravelly soils, without much reference 

 to lime content ; frequent. Aug.-Sept. 



Generally distributed in oak and chestnut woods throughout the basin, and also 

 in the maple and beech forests of the McLean district. 



N. S. to Minn., southw. to Ga., Iowa, Nebr., and Kans., including the Coastal 

 Plain. 



8. H. canadense Michx. 



Dry sandy or gravelly banks, in mostly sterile, neutral soils; infrequent. Aug.- 

 Sept. 



Around South Hill Marsh; n. of upper Coy Glen; Cascadilla woods (D.) ; bank 

 of Fall Creek (D. !) ; Cayuga Heights; North Lansing; Waterloo; and probably 

 elsewhere ; apparently absent on both the chestnut soils and the more calcareous 

 gravels of the McLean district. The factors governing the distribution of this species 

 are not clearly known. 



Lab. to B. C, southw. to N. J., Pa., Ind., Mich., S. Dak., and Oreg. 



