5a, in =ORCHIDACEAE=, p. 16.

32b. Sepals 5; corolla of united petals =OROBANCHACEAE=, p. 106.

33a. Stem thick and fleshy, leafless, thorny =CACTACEAE=, p. 77.

33b. Stem not thorny --34.

34a. Leaves none --35.

34b. Leaves reduced to small scales --40.

34c. Leaves thick and fleshy --44.

34d. Leaves hollow --45.

34e. Leaves small, all basal, bearing large glandular hairs on the
upper surface =DROSERACEAE=, p. 48.

35a. Stem none, the flowers appearing at or partially beneath the
surface of the soil 4a, in =ARACEAE=, p. 8.

35b. Stem present --36.

36a. Stem freely branched 2a, in =LILIACEAE=, p. 10.

36b. Stem unbranched, except possibly in the flower-clusters
--37.

37a. Flowers greenish or brownish, without obvious colored petals --38.

37b. Flowers with conspicuous white or colored petals --39.

38a. Each flower with 6 small chaffy petals
4, in =JUNCACEAE=, p. 10.

38b. Petals none; each flower in the axil of a single chaffy bract
2a, in =CYPERACEAE=, p. 7.

39a. Flowers regular 34a, in =LILIACEAE=, p. 11.

39b. Flowers irregular 10a, in =ORCHIDACEAE=, p. 16.

40a. Stem erect, unbranched or with one or two branches only --41.

40b. Stem freely branched --42.

41a. Plants of moist soil, with opposite scales; corolla regular, with 4
petal-like lobes 1a, in =GENTIANACEAE=, p. 88.

41b. Swamp plants, with a few alternate scales; corolla irregular
=LENTIBULARIACEAE=, p. 105.

42a. Leaves numerous and close, concealing the stem
2a, in =CISTACEAE=, p. 74.

42b. Leaves spreading, not concealing the stem --43.

43a. Leaf-scales in small clusters; flowers greenish, with 6 petals
2a, in =LILIACEAE=, p. 10.

43b. Leaf-scales distinctly opposite; petals 5, yellow
7a, in =HYPERICACEAE=, p. 74.

44a. Sepals 2 3, in =PORTULACACEAE=, p. 34.

44b. Sepals 4 or 5 =CRASSULACEAE=, p. 48.

45a. Leaves pitcher