TREES AND SHRUBS. 209 



In the fourth form the fruit is more or less obovate, about 2.5 centimetres lonp and I centimetres in diameter, ami the involu- 

 cre varies from 2 to 4 millimetres in thickness. The nut is much compressed, jointed m rounded at the apex, mi i i i at the 

 base, usually about 2 centimetres long, nearly as broad, and about 1.5 centimetres thick. I propose for it the name of — 

 CASTA ovalis, var. obovaxis, n. var. 



I have seen specimens of this form from Petersham, M assail ; -.rut. IVlaw.ire County, 1\ •nns_\h:uu:i, 



Gloucester County, Virginia, western New York, and AHenton, Missouri. It is figured as Carya glabra in Th> - 

 America (vii. t 353, f. 1, 3, 4, 5) from a specimen from Allenton. This is the common 1'iguut in many parts of the middle west- 



Hicoria borealis Ashe is probably a form of this species, but I have seen only a single tree on Belle Isle in the 1 1 

 Michigan, and I have been unable to learn if this is the type station. The Belle Isle tree has scaly bark and ovoil 

 tened fruit with an involucre from 3 to 3.5 millimetres thick, dehiscent by very iurrowly wtagtd -mures extending to the base; 



spicuously ridged to the b«M with shinier ridges -.ha pale shell 



1 millimetre or less in thickness and a sweet »eed. If these character* are constant on other trees this might be called - 

 Carya ovalis, var. borkai .is, a. mt. 



Hicoria borealis, A.be, Notes on Hickories (1896). _ Britton & Brown, ///. PI iii. 512, f. 110* - Br. t tun. Mk 325. - Unt.ou 

 & Shafer, Trees N. Am. 236, f. 194. 



Carya borealis, C. K. Schneider, III. Handb. Laubholzk: i. 803 (1906). 



