16a, in =SCROPHULARIACEAE=, p. 103.

31b. Flowers 6 mm. wide or larger --32.

32a. Ovary 1 --33.

32b. Ovaries numerous --37.

33a. Leaves lobed or cleft --34.

33b. Leaves entire or toothed --35.

34a. Leaves deeply 2-cleft; stamens 8
3a, in =BERBERIDACEAE=, p. 40.

34b. Leaf 1, palmately lobed; stamens numerous
1a, in =PAPAVERACEAE=, p. 41.

35a. Flowers dull red =ARISTOLOCHIACEAE=, p. 25.

35b. Flowers white or pinkish --36.

36a. Leaves entire; stamens with good anthers 5
13, in =SAXIFRAGACEAE=, p. 50.

36b. Leaves minutely toothed; stamens 8-10
14a, in =ERICACEAE=, p. 85.

37a. Leaves lobed or divided =RANUNCULACEAE=, p. 35.

37b. Leaves crenate or toothed 64a, in =ROSACEAE=, p. 56.

--38--

38a. Flowers of the composite type, with several or many small
flowerets closely aggregated into a dense head surrounded by a
calyx-like involucre of small bracts
10, in =COMPOSITAE=. p. 114.

38b. Flowers separate; variously clustered, but never crowded into
involucred heads --39.

39a. Flowers in dense close spikes --40.

39b. Flowers in open loose clusters --42.

40a. Flower-stalk leafless below the spike
=PLANTAGINACEAE=, p. 107.

40b. Flower-stalk with several bracts --41.

41a. Leaves entire 9c, in =ORCHIDACEAE=, p. 16.

41b. Leaves toothed 6a, in =SCROPHULARIACEAE=, p. 102.

42a. Flowers in umbels --43.

42b. Flowers in racemes, panicles, flat-topped clusters, or merely
1 or 2 --45.

43a. Leaves almost round, peltate, palmately veined
3a, in =UMBELLIFERAE=, p. 80.

43b. Leaves at least twice as long as broad, with a single mid-vein
--44.

44a. Stamens 5 =PRIMULACEAE=, p. 87.

44b. Stamens 10 15, in =ERICACEAE=, p. 85.

45a. Leaves cylindrical, hollow, obtuse. 1a, in =LOBELIACEAE=, p. 113.

45b. Leaves beset on the upper side with long glandular hairs; bog plant
with flowers in racemes