74 BULLETIN OF THE LABORATORIES 



627. P. Virginianum L. 



Open woods in rich soil, not rare. August 20, 1887; August 20, 

 1890; August 24, 1891. 



628. P. arifolium L. Halberd-leaved Tear-thumb. 



Low grounds, common. August 8, 1887; August 4, 1890. 



629. P. sagittatum L. Arrow-leaved Tear-thumb. 

 Low. grounds, common. August 16, 1890. ' 



630. P. Convolvulus L. Black Bindweed. 

 August 20, 1888; August 15, 1889. 



6-51. P. dumetorum L. Var. scandens Gray. 

 September 2, 1887; September 16, 1890. 



297. Fagopyrum Tourn. 



632. F. esculentum Moench. Buckwheat. 

 Spontaneous in waste places. August 6, 1890. 



LXXIV. ARISTOLOCHIACEAE. 

 298. AsARUM Tourn. 



633. A. Cariadense L. Wild Ginger. 



Damp woods, somewhat rare; Gravel Pit. May 6, 1887; May 

 10, iSgo; June 13, 1891. 



299. Aristolochia Tourn. 



634. A. Serpentaria L. Virginia Snakeroot. 

 Rich woods, somewhat rare but widely scattered. 



LXXV. LAUR.A.CEAE. 



300. Sassafras Nees. 



635. S. officinale Nees. 



Rich woods, common. May 11, 1889. 



301. Lindera Thunb. 



636. L. Benzoin Blume. Spice Bush. 



Edges of swamps, rather common; Spring Valley. April 13, 

 1887; April 14, 1888; April 8, 1889; April 12, 1890; April 21, 1891. 



