»9 BULLETIN OF THE LABORATORIES 



690. P; tremuloides Michx. American Aspen. 

 Herbarium of Denison University. April 12, 1887; April a, 

 1889. 



69 r, P. grandidentata Michx. Large-toothed Aspen. 

 Rocky woods, common in eastern part of county. April 18, 

 1891. 



692. P. basamifera L. Var. candicans Gray. Balm of Gilead. 

 A few scattered trees throughout the county. April 5, 1890; 



April 1 8, 1 89 1. 



693. P. monilifera Ait. Cotton-wood. 



Creek banks, common. April 19, 1889; April 18, 1891. 



LXXXIV. CONIFERAE. 

 329. PiNUS Tourn. • 



694. P. rigida Mill. Pitch Pine. 



Dry, rocky hillsides, rare; Pine Hill, Vanattasburg. 



695. ' P. inops Ait. Jersey or Scrub Pine. , 

 Dry, rocky hills, rare; Toboso. 



330. TsuGA Carriere. 

 > 696. T. Canadensis Carr. Hemlock. 



Dry, rocky hillsides, rare; Spruce Hill and Toboso. 



331. Larix Tqurn. 



697. L. Americana Michx. Tamarack. 



It is doubtful whether this species occurs native here, although it 

 has been reported. It is, however, common in cultivation. 



332. JUNIPERUS L. ' 



698. J. communis L. Common Juniper. 



Dry, rocky woods, especially in clearings, common. 



699. J. Virginiana L. Red Cedar. 

 Similar situation to the last. 



LXXXV, HYDROCHARIDACEAE. 



333. Vallisneria L. 



700. V. spiralis L. Eel Grass. Tape Grass. 



Abundant in the Licking Reservoir and the Ohio Canal. August 

 22, 1890; August 8, 1891. ' 



