74a. Bark of the ripe twigs green 1b, in =CELASTRACEAE=, p. 69.

74b. Bark of the ripe twigs brown, reddish, or gray --75.

75a. Twigs with a prominent hairy ridge extending downward from the middle of the line connecting the petiole bases 13a, in =CAPRIFOLIACEAE=, p. 110.

75b. Twigs without any p.u.b.escent ridge --76.

76a. Erect shrubs; leaves obviously toothed 11b, in =CAPRIFOLIACEAE=, p. 110.

76b. Spreading shrubs; most of the leaves entire, and only here and there some with serrate margins 18b, in =CAPRIFOLIACEAE=, p. 110.

77a. Leaves silvery beneath with a dense coating of scales =ELAEAGNACEAE=, p. 77.

77b. Leaves green beneath, or somewhat hairy and light-colored --78.

78a. Aquatic plant with lanceolate leaves, and stems bending over and into the water 1a, in =LYTHRACEAE=, p. 77.

78b. Not truly aquatic, although frequently in wet places --79.

79a. Leaves evergreen, as shown by their presence on the older stems 18a, in =ERICACEAE=, p. 85.

79b. Leaves deciduous each year --80.

80a. Leaves dotted with translucent dots, easily seen when the leaf is held to the light 1a, in =HYPERICACEAE=, p. 73.

80b. Leaves not dotted with translucent dots --81.

81a. Lateral veins curved forward and running almost parallel to the leaf-margin =CORNACEAE=, p. 83.

81b. Lateral veins spreading, and not paralleling the leaf-margin --82.

82a. Leaves with stipules 1a, 1a, in =RUBIACEAE=, p. 108.

82b. Leaves with a prominent ridge connecting them at the base --83.

82c. Leaves with neither stipules nor connecting ridges 1a, in =OLEACEAE=, p. 88.

83a. Bundle-scar one in each leaf-scar 18b, in =CAPRIFOLIACEAE=, p. 110.

83b. Bundle-scars three in each leaf-scar (Honeysuckle) 12, in =CAPRIFOLIACEAE=, p. 110.

84a. Leaves compound --85.

84b. Leaves simple --95.

85a. Stems p.r.i.c.kly or th.o.r.n.y --86.

85b. Stems without p.r.i.c.kles or thorns --88.

86a. Leaves twice-pinnate 4a, 1a, in =ARALIACEAE=, p. 80.

86b. Leaves evenly pinnate 5b, in =LEGUMINOSAE=, p. 58.

86c. Leaves odd-pinnate or trifoliate --87.

87a. Leaflets entire 1a, 1a, in =RUTACEAE=, p. 65.

87b. Leaflets serrate 3b, 3b, in =ROSACEAE=, p. 51.

88a. Leaflets 3 --89.

88b. Leaflets 5 to many --91.

89a. Tall shrubs; leaflets entire or minutely toothed 1b, in =RUTACEAE=, p. 65.

89b. Shrubs 2 m. high or less; leaves conspicuously toothed --90.

90a. Stipules present 17b, in =ROSACEAE=, p. 53.

90b. Stipules none 1b, in =ANACARDIACEAE=, p. 68.

91a. Leaflets 6-25 mm. long --92.

91b. Leaflets 30 mm. long, or more --93.

92a. Leaflets mostly 5, rarely 3 or 7 7a, in =ROSACEAE=, p. 52.

92b. Leaflets mostly 9-19, 15 mm. long or more 26a, in =LEGUMINOSAE=, p. 60.

92c. Leaflets mostly 25-45, less than 15 mm. long 8a, in =LEGUMINOSAE=, p. 58.

93a. Leaflets entire 3a, in =ANACARDIACEAE=, p. 68.

93b. Leaflets entire, except for 1-4 large glandular teeth near their base =SIMARUBACEAE=, p. 65.

93c. Leaflets toothed throughout --94.

94a. Juice milky 1a, in =ANACARDIACEAE=, p. 68.

94b. Juice not milky 3a, in =ROSACEAE=, p. 51.

95a. Leaves minute, scale-like, appressed 2a, in =CISTACEAE=, p. 74.

95b. Leaves 3-10 mm. long, spreading, completely rolled into a tube =EMPETRACEAE=, p. 68.

95c. Leaves normal in shape, green in color --96.

96a. Leaves evergreen, as shown by their presence on the older parts of the stem 4b, in =ERICACEAE=, p. 84.