368 



JUGLANDACEAE 



Carya 



smooth, the shell thin, rarely thick, thinner than that of the preceding 

 species; kernel sweet without astringency. 

 C. Nuts ellipsoidal. 



Inner surface of fresh husk without a resinous odor; nut rounded at base, 



acute at apex, broadest about the middle 7. C. ovalis. 



Inner surface of fresh husk with a resinous odor; nuts smaller and 



usually more compressed than those of the preceding 



7a. C. ovalis var. odorata. 



C. Nuts obovoid or oblong. 



D. Nuts taper-pointed or rounded at the apex, broadest above the middle. 



Nut without an elongate or stipitate base 7b. C. ovalis var. obovalis. 



Nut with an elongate or stipitate base 



7c. C. ovalis var. obovalis f . acuta. ' 



D. Nuts oblong, cordate or subcordate at the apex. 



Branchlets glabrous at fruiting time 7d. C. ovalis var. obcordata. 



Branchlets more or less pubescent at fruiting time 



7e. C. ovalis var. obcordata f. vestita. 



Involucres 3-4.5 mm thick; winter buds reddish brown, at least the margins of 



the scales pubescent 8. C. pallida. 



B. Branchlets and leaves densely covered with a rusty brown pubescence when 

 they first appear; dry husk 3-3.5 mm thick 9. C. Buckleyi var. arkansana. 



1. Carya Pecan (Marsh.) Engler & Graebner. (Carya illinoensis 

 (Wang.) K. Koch and Hicoria Pecan (Marsh.) Britt.) Pecan. Map 

 758. Infrequent or local in the Ohio River Bottoms as far east as Beth- 

 lehem, Clark County, up the Wabash River as far north as 4 miles south 

 of Covington, Fountain County, up White River into Greene County, and 

 known up the Muscatatuck River into Washington County. It was formerly 

 a common tree in Point Township of Posey County and in the southwest 

 part of Gibson County. Its habitat is river bottoms that are usually inun- 

 dated annually. 



Mississippi Valley from Ind. to Iowa, southw. to La. and Tex. 



2. Carya cordiformis (Wang.) K. Koch. (Hicoria cordiformis (Wang.) 

 Britt.) Bitternut Hickory. Generally known in Indiana as pignut 

 hickory. Map 749. An infrequent to frequent tree throughout the state. 



