oncealing 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 clusters or solitary, but never in
heads with a conspicuous involucre --100.

99a. Bracts 4, white and conspicuous; stem not thorny
4a, in =CORNACEAE=, p. 83.

99b. Bracts green; stem thorny =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 d