n each leaf-scar 2b, in =URTICACEAE=, p. 23.

144a. Leaf-buds with only 1-3 visible bud-scales
10, in =BETULACEAE=, p. 22.

144b. Leaf-buds with more than 3 visible scales --145.

145a. Bark of the branches smooth and dark gray, the larger stems fluted
with projecting longitudinal ridges 1b, in =BETULACEAE=, p. 21.

145b. Branches without projecting ridges 4, in =BETULACEAE=, p. 22.

146a. Pith 3-angled 8, in =BETULACEAE=, p. 22.

146b. Pith 5-angled 13b, in =FAGACEAE=, p. 23.

146c. Pith cylindrical --147.

147a. Visible outer bud-scales 2 or more --148.

147b. Buds with a single visible outer scale
13, in =SALICACEAE=, p. 20.

148a. Bundle-scars 3 in each leaf-scar =MYRICACEAE=, p. 20.

148b. Bundle-scars more than 3 in each leaf-scar
2b, in =URTICACEAE=, p. 23.

149a. Flowers dark red-purple, about 3 cm. wide =ANONACEAE=, p. 40.

149b. Flowers bright pink, irregular, about 1 cm. wide
3a, in =LEGUMINOSAE=, p. 58.

149c. Flowers white, with 5 conspicuous petals --150.

149d. Flowers greenish or yellowish, small, inconspicuous --152.

150a. Ovary 1, superior, i. e., in the center of the flower and not
attached to surrounding parts 36, in =ROSACEAE=, p. 54.

150b. Ovary inferior, appearing as a swelling below the calyx at
the apex of the pedicel --151.

151a. Flowers in racemes or solitary 42b, in =ROSACEAE=, p. 55.

151b. Flowers in flattened or rounded branching clusters
42a, in =ROSACEAE=, p. 55.

152a. Stems thorny 1a, in =RUTACEAE=, p. 65.

152b. Stems not thorny --153.

153a. Bark pleasantly aromatic when crushed; perianth with 6 parts
--154.

153b. Bark not pleasantly aromatic; perianth with 4 short lobes
=THYMELAEACEAE=, p. 77.

154a. Flowers in sessile lateral clusters
1a, in =LAURACEAE=, p. 41.

154b. Flowers in peduncled terminal clusters
1b, in =LAURACEAE=, p. 41.

--155--

155a. Leaves narrow, needle