200 TREES AND SHRUBS. 



Mountains to northern Alabama and northern Florida ; westward and southwestward it is replaced by other species, 

 and the only specimens I have seen gathered west of New York were from Delaware and Johnston Counties, Indiana 



(C C. Beam)} , 



There has always been much confusion about this tree. It has sometimes been beheved that it was the Jugh 

 glabra of Miller ; but this is so doubtful, as Miller only described the leaves of a cultivated tree, that glabra cannot be 

 safely taken as its specific name. The younger Michaux in his Juglans porcina united the pear-shaped and round- 

 fruited Pignuts, and it was Pursh who in his variety ficiformis of Juglans porcina probably first distinguished 

 tree. Nuttall adopted without remark Michaux's porcina, and as Michaux's description seems to indicate that the 

 with pear-shaped fruit was the type of his species Nuttall's Carya porcina can perhaps be safely adopted for it, espe- 

 cially as the species described by Clayton, which is quoted by Miller as a synonym of his Juglans glabra, cannot " ' 

 our plant and is probably one of the forms of Carya ovalis. 

 i A distinct form of the Pignut may be distinguished as — 



In this form the fruit is acute at the apex and gradually narrowed below into a long stipe-like base ; it is only slightly c<*. 

 pressed, from 3 to 3.5 centimetres long, about 2 centimetres in diameter, with an involucre about 3 millimetres in thickn*, 

 splitting usually freely to the middle or occasionally by one suture only to the base. The nut is pale, acute or rarely roundest 

 the apex, gradually narrowed and acuminate at the base, prominently ridged to the middle, about 2.5 centimetres long, 2 c»nti- 

 metres wide and 1.5 centimetres thick, with a shell 2.5 millimetres in thickness. 



A tree, sometimes 25 metres high with a trunk from 3 to 4 decimetres in diameter, covered with pale gray bark irregularly 

 divided into narrow ridges, small spreading and drooping branches, and slender reddish glabrous branchlets. Winter-buds ovate 

 acute, from 9 to 18 millimetres long. Flowers the end of May. Fruit ripens in October. 



New York : Seneca Park, Rochester, Munroe County, B. H.Slavin, May 17, 1910, August 13, 1911, April 8 and May 30, 1912 

 (No. 4, type), September 28, 1911 (No. 106) ; Conesus Lake, Livingston County,/. Dunbar (No. 57) ; Mendom, Munroe County, 

 C. C. Laney and R. E. Horsey (No. 518), R. E. Horsey, February 21, 1913. 



This form appears to be common in Jackson, Michigan, where it has been collected by Mr. C. K. Dodge. A specimen from 

 Huntsville, Alabama, in the Arboretum collection, and Tracy's No. 2803 collected in Mississippi in 1894 are possibly of this variety. 



C. S. S. 



EXPLANATION OF THE PLATE. 

 Plate CLXXIX. Carya porcina. 



1. A flowering branch, natural size. 



2. A staminate flower, enlarged. 



3. A stamen, enlarged. 



4. A pistillate flower, enlarged. 



5. A fruiting branch, natural size. 



6. Cross section of a fruit, natural size. 



7. A nut, natural size. 



8. A winter branchlet, natural size. 



9. A fruit of the variety acuta, natural size 

 10. A nut of the variety acuta, natural size. 



\ 



