2b, in =FAGACEAE=, p. 22.

5b. From 4 to 7 bud-scales visible on each leaf-bud --6.

5c. From 8 to 20 bud-scales visible on each leaf-bud; buds long and
slender; bark of the trunk smooth --8.

6a. Bundle-scars 5 or more 2b, in =URTICACEAE=, p. 23.

6b. Bundle-scars 3 --7.

7a. Twigs bearing numerous dwarf branches thickly covered with crowded
leaf-scars (Birch) =BETULACEAE=, p. 21.

7b. Twigs without dwarf branches (Ironwood) 9a, in =BETULACEAE=, p. 22.

8a. Trunk cylindrical or nearly so 2a, in =FAGACEAE=, p. 22.

8b. Trunk prominently fluted with longitudinal ridges
1b, in =BETULACEAE=, p. 21.

9a. Bundle-scars 3 in each leaf-scar --10.

9b. Bundle scars more than 3 in each leaf-scar --12.

10a. Pith divided into separate cavities by transverse partitions
1a, in =JUGLANDACEAE=, p. 21.

10b. Pith not partitioned --11.

11a. Buds small, with only one external bud-scale
1b, in =SALICACEAE=, p. 19.

11b. Buds with more than one outer bud-scale
1a, in =SALICACEAE=, p. 19.

12a. Buds clustered near the tips of the twigs
1b, in =FAGACEAE=, p. 22.

12b. Buds not clustered at the tips of the twigs --13.

13a. Buds with about 3 visible bud-scales 2b, in =FAGACEAE=, p. 22.

13b. Terminal bud large, with 4 or more visible bud-scales
1b, in =JUGLANDACEAE=, p. 21.

14a. Flowers conspicuous, brightly colored, at least 8 mm. wide.
with both calyx and corolla --15.

14b. Flowers inconspicuous, seldom brightly colored, and then less
than 8 mm. wide --17.

15a. Flowers irregular, pink or red 3a, in =LEGUMINOSAE=, p. 58.

15b. Flowers regular, white --16.

16a. Ovary one, superior, in the center of the flower
32b, in =ROSACEAE=, p. 54.

16b. Ovary inferior, appearing as a swelling below the calyx at the
summit of the pedicel 42b, in =ROSACEAE=, p. 55.

17a. Leaf-scars and buds opposite --18.

17b. Leaf-scars and buds alternate --19.

18a. Bundle-scar one in each leaf-scar 1b, in =OLEACAE=, p. 88.

18b. Bundle-s