230 BOTANICAL GAZETTE [SEPTEMBER 
Branchlets slender; leaves 5-7-foliolate; involucre of the fruit tardily 
dehiscent to the middle, indehiscent or opening freely to the base; shell 
of the nut thick, bark close or sometimes scaly in no. 1 
Branchlets and leaves not covered when they first appear with rusty 
rown pubescence. 
Involucre of the fruit 3-5.5 mm. in thickness, opening freely to the 
ase; leaves usually 7-foliolate; winter-buds pubescent. 
Leaflets hoary tomentose below in early spring, slightly pubescent 
at maturity; petioles and rachis glabrous; fruit broad obovoid; 
Leaflets covered in early spring with silvery scales, pale and pubescent 
below during the season; petioles and rachis more or less thickly 
covered with fascicled Sites: fruit ellipsoidal to obovoid or globose; 
branchlets glabrous or slightly pubescent......... 11. C. pallida 
Involucre of the fruit 1-3 mm. in thickness; winter-buds glabrous or 
puberulous. 
Leaves 5-, rarely 7-foliolate, glabrous or rad slightly pubescent; 
fruit obovoid, often narrowed below into a stipitate base, the 
involucre indehiscent or tardily dehiscent........... 12. C. glabra 
Leaves generally 7-foliolate, glabrous or rarely pubescent; fruit short- 
oblong, subglobose or obovoid, the involucre opening freely to the 
ase; bark often more or less scaly.............:.-- 13. C. ovalis 
Branchlets and leaves densely covered when they first appear with rusty 
brown pubescence; leaflets usually 5-7; w winter-buds rusty pubescent. 
aments zi eee sas often from the axils of i branchlets 
oon bec UI oe ee . C. floridana 
Fru + sadiclohee to betidlly obovoid, ellipsoidal or genres the 
seculone on the different varieties 2-13 mm. in — branchlets 
pubescent through their first season................ . C. Buckleyt 
1. CARYA PECAN Engl. and Graeb.—The pecan was evidently 
planted by the Indians in the Mississippi Valley, and it is sometimes 
difficult to determine the natural distribution of this tree. It is 
probably indigenous in western Mississippi and in West Feliciana 
Parish, Louisiana, but the statement in my Silva of North America 
that the pecan extended to central Mississippi and Alabama must, 
I think, be taken to refer to planted or possibly naturalized trees; 
and it is possible that some of the pecan trees in southern Indiana, 
especially those toward the Ohio border, were planted by the 
Indians or are descendants of their trees. Westward in the United 
States the pecan ranges to the valley of the south fork of the 
