CEAE=, p. 86.

180b. Petals separate from each other --181.

181a. Petals 4 --182.

181b. Petals 5 --183.

181c. Petal-like sepals 6; real petals none; foliage spicy-aromatic
1b, in =LAURACEAE=, p. 41.

181d. Petals 6; sepals also present --187.

182a. Flowers in late spring or early summer
2a, in =CORNACEAE=, p. 83.

182b. Flowers in autumn =HAMAMELIDACEAE=, p. 51.

183a. Corolla irregular, the upper petal largest
3b, in =LEGUMINOSAE=, p. 58.

183b. Corolla regular, all petals alike in size and shape --184.

184a. Stamens 5 --185.

184b. Stamens 10 or more 24, in =ROSACEAE=, p. 53.

185a. Flowers in loose racemes or axillary clusters
2, in =SAXIFRAGACEAE=, p. 49.

185b. Flowers in branching clusters --186.

186a. Leaves palmately lobed; stem thorny
1a, in =ARALIACEAE=, p. 80.

186b. Leaves not lobed; stem not thorny
1b, in =RHAMNACEAE=, p. 71.

187a. Flowers dark red-purple =ANONACEAE=, p. 40.

187b. Flowers yellow 2a, in =BERBERIDACEAE=, p. 40.

GROUP 2, UNUSUAL PLANTS

1a. Small brown leafless plants, growing as parasites on the tamarack or
black spruce =LORANTHACEAE=, p. 25.

1b. Aquatic plants, with all or most of the leaves submerged, or
leafless --2.

1c. Aquatic plants, with the leaves or the whole plant floating on or
near the surface --20.

1d. Terrestrial or marsh plants, without floating or submerged leaves
--29.

2a. Submerged aquatics, without leaves --3.

2b. Submerged aquatics, with the leaves linear or dissected --4.

3a. Flowers showy, yellow or purple =LENTIBULARIACEAE=, p. 105.

3b Flowers small and inconspicuous, sessile, purplish or greenish
3a, in =HALORAGIDACEAE=, p. 79.

4a. Leaves linear or lanceolate, not lobed or dissected --5.

4b. Leaves more or less lobed or dissected --13.

5a. Leaves all basal --6.

5b. Stem-leaves present --7.

6a. Flowers blue, 1 cm. long or more; leaves cylindrical, blunt,
hollow, partitioned lengthwise 1a, in =LOBELIAC