es compound --7.

2b. Leaves simple --18.

3a. Stem-leaves all or chiefly opposite or whorled (the bracts of the
flower clusters may be alternate) --4.

3b. Stem-leaves all or chiefly alternate --5.

4a. Flowers small and inconspicuous, the perianth none or greenish
or chaffy, and never petal-like in appearance --50.

4b. Flowers with a white or colored petal-like perianth --66.

5a. Flowers small and inconspicuous, without any white or colored
petal-like perianth --118.

5b. Flowers large or small, but with a white or colored petal-like
perianth --6.

6a. Flowers small, not exceeding 3 mm. in length or breadth --144.

6b. Flowers larger, more than 3 mm. in length or breadth --166.

--7--

7a. Leaves twice to three times compound or dissected --8.

7b. Leaves once-compound --11.

8a. Flowers in racemes 2b, in =FUMARIACEAE=, p. 41.

8b. Flowers in umbels --9.

9a. Flowers about 3 mm. wide, white or greenish-white --10.

9b. Flowers 10-20 mm. wide, conspicuous 45b, in =RANUNCULACEAE=, p. 39.

10a. Leaflets 5-15 cm. long 5b, in =ARALIACEAE=, p. 80.

10b. Leaflets not over 2 cm. long 16a, in =UMBELLIFERAE=, p. 81.

11a. Leaflets 2 3a, in =BERBERIDACEAE=, p. 40.

11b. Leaflets three or more --12.

12a. Leaflets entire or very finely toothed --13.

12b. Leaflets coarsely toothed or lobed --15.

13a. Flowers irregular, in dense head-like umbels
37a, in =LEGUMINOSAE=, p. 61.

13b. Flowers consisting of a greenish or purplish bract wholly or partly
enclosing a fleshy spike 2, in =ARACEAE=, p. 8.

13c. Flowers regular, solitary or in loose clusters --14.

14a. Leaflets reverse heart-shape, not over 2 cm. long
=OXALIDACEAE=, p. 64.

14b. Leaflets 4-10 cm. long 1c, in =GENTIANACEAE=, p. 88.

15a. Flowers with colored or white petals and green or colored sepals
--16.

15b. Flowers with one kind of perianth only (calyx), with broad and
petal-like parts 32, in =RANUNCULACEAE=, p. 38.

15c. Flowers with white petal-like sepals and small inconspicuous petals
38b, in =RANUNCULACEAE=, p. 39.

16a. Petals and sepals each 4