eeply 4-lobed, with a single style
=LABIATAE=, 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.

108a. A stamen in front of the middle of each petal
=PRIMULACEAE=, p. 87.

108b. Stamens located between the petals or lobes of the corolla,
or else so far down in the tubular corolla that their
position is not easily ascertained --109.

109a. Corolla salver-form, with a very slender tube, and abruptly
spreading lobes =POLEMONIACEAE=, p. 92.

109b. Corolla salver-form, with a wide tube and fringed blue petals
=GENTIANACEAE=, p. 88.

109c. Corolla rotate, funnel-form, or bell-shape =GENTIANACEAE=, p. 88.

110a. Ovary deeply 4-lobed, appearing like 4 separate ovaries;
style 1 =LABIATAE=, p. 95.

110b. Ovary not 4-lobed --111.

111a. Stamens 2 --112.

111b. Stamens 3 =VALERIANACEAE=, p. 111.

111c. Stamens 4 --113.

112a. Flowers in dense heads 1a, in =ACANTHACEAE=, p. 107.

112b. Flowers solitary or in loose clusters
=SCROPHULARIACEAE=, p. 101.

113a. Corolla distinctly 2-lipped and irregular --114.

113b. Corolla not distinctly 2-lipped, its 5 lobes all alike or nearly
so --115.

114a. Calyx 2-lipped; the upper lip with 3 awl-shape teeth, the
lower with 2 short teeth; flowers in slender terminal spikes
=PHRYMACEAE=, p. 107.

114b. Calyx not obviously 2-lipped, its teeth equal or