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 =LOBELIACEAE=, p. 113. 6b. Flowers yellow; leaves minute =LENTIBULARIACEAE=, p. 105. 6c. Flowers white, in clusters; leaves linear-lanceolate, acute, not hollow 1b, in =ALISMACEAE=, p. 3. 6d. Flowers greenish, solitary at the end of elongated peduncles; leaves very long and ribbon-like, flat or trough-shape 1a, in =HYDROCHARITACEAE=, p. 3. 6e. Flowers minute, whitish or lead-color, in heads =ERIOCAULACEAE=, p. 9. 7a. Leaves alternate --8. 7b. Leaves opposite --10. 7c. Leaves whorled --12.