les; leaves principally basal
=SAXIFRAGACEAE=, p. 49.

164b. Flowers in rounded or flattened clusters; leaves principally
on the stem =SANTALACEAE=, p. 24.

164c. Flowers in racemes, which become elongated at maturity --165.

165a. Foliage glabrous 8b, in =PRIMULACEAE=, p. 87.

165b. Foliage pubescent =BORAGINACEAE=, p. 93.

--166--

166a. Juice milky or colored --167.

166b. Juice watery, not colored --172.

167a. Apparent flowers consisting of a few petal-like bracts, inclosing
a few inconspicuous flowers without petals. In some of them a
3-lobed ovary with 3 styles may be seen
=EUPHORBIACEAE=, p. 66.

167b. Plants of the composite type, with several or many small flowerets
closely aggregated in dense heads subtended by a calyx-like
involucre of small bracts 11, in =COMPOSITAE=, p. 115.

167c. Flowers never aggregated in involucred clusters resembling a
single flower --168.

168a. Corolla very irregular; stamens protruding
=LOBELIACEAE=, p. 113.

168b. Corolla regular --169.

169a. Stamens with ordinary visible anthers; ovary 1 --170.

169b. Stamens so grown together and to the stigma as to be almost
unrecognizable; ovaries 2 =ASCLEPIADACEAE=, p. 90.

170a. Petals separate =PAPAVERACEAE=, p. 41.

170b. Petals united --171.

171a. Stamens attached to the tube of the corolla
=CONVOLVULACEAE=, p. 91.

171b. Stamens attached at the very base of the corolla
=CAMPANULACEAE=, p. 112.

172a. Plants of the composite type, with several or many small
flowerets closely aggregated into dense heads subtended by a
calyx-like involucre of small bracts --173.

172b. Flowers solitary or clustered, but not in involucred heads
--174.

173a. True composites, without a normal calyx =COMPOSITAE=, p. 113.

173b. A normal calyx with each floweret; leaves compound with 3 leaflets
=LEGUMINOSAE=, p. 58.

174a. Flowers irregular, i. e., the c