. Spike terminal, with pistillate flowers at the base and
staminate ones at the apex =TYPHACEAE=, p. 2.

6b. Spike short, apparently lateral, near the apex of the stem
3a, in =ARACEAE=, p. 8.

7a. Flowers in globose heads which are arranged in spikes, the lowest
heads pistillate, the upper staminate; ovary 1-celled
=SPARGANIACEAE=, p. 2.

7b. Flowers in globose woolly heads terminating leafless unbranched
stalks =ERIOCAULACEAE=, p. 9.

7c. Flowers in a spike-like raceme; ovaries 3-6, separate or nearly so
=JUNCAGINACEAE=, p. 3.

7d. Flowers in heads or panicles, all perfect, not woolly, with one
ovary --8.

8a. Leaves less than 1 cm. wide, or none; divisions of the perianth
6 =JUNCACEAE=, p. 10.

8b. Leaves 2 cm. wide or more; petals 5
2a, in =UMBELLIFERAE=, p. 80.

9a. Flowers regular, with all the petals of approximately the same size
and shape --10.

9b. Flowers irregular, with the petals of each flower not of the same
size or shape --22.

10a. Ovaries 3 or more, separate or barely united with each other
at the base --11.

10b. Ovary one in each flower --12.

11a. Ovaries 3-6 in number; flowers in spikes or racemes; leaves linear
=JUNCAGINACEAE=, p. 3.

11b. Ovaries more than 6 =ALISMACEAE=, p. 3.

12a. Flowers or flower-clusters lateral, axillary or apparently so
--13.

12b. Flowers or flower-clusters terminal or on leafless stalks
--14.

13a. Leaves minute and scale-like; flowers greenish-yellow
2a, in =LILIACEAE=, p. 10.

13b. Leaves linear, grass-like 3b, in =IRIDACEAE=, p. 13.

13c. Leaves lanceolate or broader, not grass-like or scale-like
2b, in =LILIACEAE=, p. 10.

14a. Divisions of the perianth 5-12 cm. long --15.

14b. Divisions of the perianth less than 5 cm. long --16.

15a. Flowers blue, or blue marked with yellow 1a, in =IRIDACEAE=, p. 15.

15b. Flowers not blue 12a, in =LILIACEAE=