18 BULLETIN 1282, U. S. DEPARTMENT OF AGRICULTURE 
KEY 
[The numbers in parentheses at right refer to the varietal descriptions which follow.] 
A. Stem scar sharply dorsally sloping. 
I. Wing very prominent. 
2. Very short nuts. 
(3) Nuts medium in plumpness. 
a. Ventral edge of nut ridged. 
(a) Kernel thin to medium and rather smooth (27). 
(6) Kernel plump and very pubescent (71). 
b. Ventral edge of nut smooth (75). 
3. Nuts medium in length. 
(3) Nuts medium in plumpness. 
b. Ventral edge of nut smooth. 
(a) Dorsal shoulder of kernel square and humped. 
§ Kernel very pubescent and medium in plumpness (8). 
§§ Kernel plump. 
* Pubescence on kernel medium, kernel rather dark in 
color, apex of kernel slightly tapering (41). 
** Kernel smooth, rather light in color (57). 
II. Wing medium in prominence. 
Pe Nuts very short, very plump, very small (56). 
3. Nuts medium in length. 
(3) Nuts medium. in thickness. 
a. Ventral edge of nut ridged (99). 
b. Ventral edge of nut smooth. 
(a) Kernel thin, dorsal shoulder humped (38). 
(0) Kernel plump, dorsal shoulder square, much sloping, often 
dished (67). 
III. Wing not prominent. 
2. Nut corrugated like peach pit (142). 
3. Nut smooth (18). 
IV. Wing not prominent to medium prominent, nut medium long, medium plump, 
kernel plump (26). 
V. Wing medium to prominent. 
2. Nuts very short, medium plump; kernel plump and very pubescent (29). 
38. Nuts medium in length 
(3) Nuts medium in plumpness. 
b. Veniral edge of nut smooth. 
(a) Kernel thin. 
§ Kernel smooth and large; outer shell quite crumbly, rough 
and porous (70) 
§§ Kernel with medium amount of pubescence, nut and kernel 
rather small, shell smooth, hard, rather flinty (74). 
B. Stem scar gently dorsally sloping. 
Wing very prominent. 
2. Nuts very short, ventral edge ridged, and grooved longitudinally, kernel 
pubescent (5). 
38. Nuts medium in length. 
(1) Nuts thin. 
a. Ventral edge ridged (60). 
6. Ventral edge smooth, kernel thin (122). 
(3) Nuts medium in thickness. 
a. Ventral edge ridged (77). 
6. Ventral edge smooth. 
(ob) Kernel plump. 
§ Kernel with dorsal shoulder humped and square. 
* Nut large (32). 
** Nut quite s small (42). 
eae with dorsal shoulder round, not square and humped 
4 
II. Wing medium in prominence. 
oe Nuts medium in length. 
(2) Nuts very plump. 
b. Ventral edge smooth. 
(6) Kernel plump. 
§ Kernel very pubescent (63). 
§§ Kernel medium in pubescence. 
* Nut medium in size (2). 
** Nut exceedingly small (147). 
(3) Nut medium in plumpness. 
a. Ventral edge ridged. 
(bo) Kernel plump (16). 
(c) Kernel medium plump with square humped dorsal shoulder 
and very pubescent (53). 
6b. Ventral edge smooth. : 
(a) Kernel with square, humped, dorsal shoulder. 
§ Kernel plump, seldom double, and shell having a decidedly 
pink ventra: edge (3). 
§§ Mostly with double kernels; when single, kernels medium 
in plumpness (55). 
Ill. Wing not prominent. 
3. Length of nut medium. 
(3) Thickness of nut usually medium. 
b. Ventral edge of nut smooth. 
(a) Kernel decidedly thin and flat, nut very large (1). 
(b) Kernel plump, rather short, and quite smooth, i. e., only 
slightly pubescent (19). 
(c) Kernel medium plump, very pubescent, with apex very blunt, 
nut medium in size (86). , 
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