JUGLANDACEAE
SUMMER KEY TO THE SPECIES OF JUGLANS
| a. | Leaflets 11-17, the terminal usually present; pith of twigs chocolate-brown; bark of trunk rather smooth, or fissured, with broad, flat, whitish ridges; fruit elongated, sticky-downy. | J. cinerea, p. [63]. |
| aa. | Leaflets 13-23, the terminal often lacking; pith of twigs cream colored; bark of trunk rough, brownish or blackish, deeply furrowed by broad, rounded ridges; fruit globose, not sticky-downy. | J. nigra, p. [65]. |
WINTER KEY TO THE SPECIES OF JUGLANS
| a. | Pith chocolate-brown; leaf-scar with downy pad above; fruit elongated, sticky-downy; terminal bud 1/2-3/4 inch long; bark rather smooth, or fissured, with broad, flat, whitish ridges. | J. cinerea, p. [63]. |
| aa. | Pith cream colored; leaf-scar without downy pad above; fruit globose, not sticky-downy; terminal bud 1/3 inch long; bark rough, brownish or blackish, deeply furrowed by broad, rounded ridges. | J. nigra, p. [65]. |