86b. Ovaries 2, surrounded and concealed by other organs =ASCLEPIADACEAE=, p. 90.

86c. Ovaries 4-5 2b, in =CRa.s.sULACEAE=, p. 48.

87a. Leaves dotted with translucent dots (easily seen when the leaf is held to the light) =HYPERICACEAE=, p. 73.

87b. Leaves not dotted with translucent dots --88.

88a. Leaves only 1-3 mm. long, closely appressed and concealing the stem 2a, in =CISTACEAE=, p. 74.

88b. Leaves larger, not concealing the stem --89.

89a. Style 1 or none --90.

89b. Styles 2 to 7 --94.

90a. Stamens 5 --91.

90b. Stamens 10 --92.

90c. Stamens neither 5 nor 10 --93.

91a. Flowers blue, sessile in terminal spikes with leaf-like bracts =LYTHRACEAE=, p. 77.

91b. Flowers not in terminal bracted spikes =PRIMULACEAE=, p. 87.

92a. Leaves entire =LYTHRACEAE=, p. 77.

92b. Leaves toothed or crenate =ERICACEAE=, p. 84.

93a. Flowers irregular; petals 3 =POLYGALACEAE=, p. 65.

93b. Flowers regular; petals 5 or more =LYTHRACEAE=, p. 77.

94a. Sepals 2, partly attached to the ovary =PORTULACACEAE=, p. 34.

94b. Sepals 5, free from the ovary --95.

95a. Stamens 5 --96.

95b. Stamens not 5 =CARYOPHYLLACEAE=, p. 31.

96a. Flowers blue or yellow =LINACEAE=, p. 63.

96b. Flowers white or pinkish =CARYOPHYLLACEAE=, p. 31.

--97--

97a. Perianth with but one circle of floral leaves --98.

97b. Perianth consisting of both calyx and corolla --101.

98a. Flowers small, in dense heads subtended by conspicuous bracts --99.

98b. Flowers 2-5, in a colored spreading 5-lobed involucre =NYCTAGINACEAE=, p. 31.

98c. Flowers in various sorts of cl.u.s.ters or solitary, but never in heads with a conspicuous involucre --100.

99a. Bracts 4, white and conspicuous; stem not th.o.r.n.y 4a, in =CORNACEAE=, p. 83.

99b. Bracts green; stem th.o.r.n.y =DIPSACACEAE=, p. 112.

100a. Stamens 3 =VALERIANACEAE=, p. 111.

100b. Stamens 4 or 5 =RUBIACEAE=, p. 108.

101a. Anthers more numerous than the lobes of the corolla --102.

101b. Anthers just as many as the lobes of the corolla --103.

101c. Anthers fewer than the lobes of the corolla --110.

102a. Leaves simple =POLYGALACEAE=, p. 65.

102b. Leaves compound with 3 leaflets =OXALIDACEAE=, p. 64.

102c. Leaves finely dissected; stems climbing 2a, in =FUMARIACEAE=, p. 41.

103a. Ovaries 2 --104.

103b. Ovary 1, but very deeply 4-lobed, with a single style =l.a.b.i.aTAE=, p. 95.

103c. Ovary 1, not deeply lobed --105.

104a. Stamens united, surrounding and more or less concealing the ovaries, and not resembling ordinary stamens =ASCLEPIADACEAE=, p. 90.

104b. Stamens separate, of ordinary structure =APOCYNACEAE=, p. 90.

105a. Ovary inferior, appearing as a swelling below the calyx at the apex of the pedicel --106.

105b. Ovary superior, located in the center of the flower --107.

106a. Corolla 3-4-lobed =RUBIACEAE=, p. 108.

106b. Corolla 5-lobed 3b, in =CAPRIFOLIACEAE=, p. 109.

107a. Leaves toothed or deeply cut =VERBENACEAE=, p. 99.

107b. Leaves entire --108.