onspicuous lobes of the
perianth unlike in size or shape --175.

174b. Flowers regular --185.

175a. Stamens 2 or 4 =SCROPHULARIACEAE=, p. 101.

175b. Stamens 5 --176.

175c. Stamens 6 --181.

175d. Stamens 8; leaves simple =POLYGALACEAE=, p. 65.

175e. Stamens 10; leaves usually compound =LEGUMINOSAE=, p. 58.

175f. Stamens more than 10 --183.

176a. Petals separate --177.

176b. Petals united --179.

177a. Flowers greenish or purplish, in a panicle =SAXIFRAGACEAE=, p. 49.

177b. Flowers white or purplish, in compound umbels
=UMBELLIFERAE=, p. 80.

177c. Flowers solitary, or in few-flowered clusters --178.

178a. Flowers blue, yellow, or white, in spring =VIOLACEAE=, p. 75.

178b. Flowers red-orange or yellow, in summer
=BALSAMINACEAE=, p. 71.

178c. Flowers small and greenish, in spring
1a, in =VIOLACEAE=, p. 75.

179a. Anthers united; stamens protruding from the very irregular corolla
=LOBELIACEAE=, p. 113.

179b. Anthers separate; corolla almost regular --180.

180a. Corolla rotate; some or all filaments hairy
2, in =SCROPHULARIACEAE=, p. 101.

180b. Corolla funnel-form, dull yellow and purple; filaments not
hairy 12a, in =SOLANACEAE=, p. 101.

180c. Corolla funnel-form, blue or violet; filaments not hairy
7b, in =BORAGINACEAE=, p. 94.

181a. Leaves compound or dissected =FUMARIACEAE=, p. 41.

181b. Leaves simple --182.

182a. Flowers solitary =ARISTOLOCHIACEAE=, p. 25.

182b. Flowers in spikes, heads, or racemes =POLYGALACEAE=, p. 65.

183a. Leaves truly compound --184.

183b. Leaves palmately cleft; flowers 15 mm. wide or larger
6a, in =RANUNCULACEAE=, p. 36.

183c. Leaves irregularly cleft; flowers about 5 mm. wide
=RESEDACEAE=, p. 48.

184a. Petals prolonged backward into hollow spurs
6b, in =RANUNCULACEAE=, p. 36.

184b. Petals not prolonged into spurs =CAPPARIDACEAE=, p.