es less than 5 mm. long 1a, in =GENTIANACEAE=, p. 88.

59b. Leaves more than 2 cm. long --60.

60a. Inflorescence chiefly terminal, panicled
2, in =COMPOSITAE=, p. 114.

60b. Inflorescence chiefly axillary =URTICACEAE=, p. 23.

61a. Flowers on long pedicels 2, in =CARYOPHYLLACEAE=, p. 31.

61b. Flowers on short pedicels or sessile --62.

62a. Stem erect, repeatedly branched; leaves linear to oblong
=ILLECEBRACEAE=, p. 31.

62b. Stem decumbent or prostrate --63.

63a. Leaves round, ovate, or kidney-shape, rounded at the base, crenate
or lobed 12a, in =SAXIFRAGACEAE=, p. 50.

63b. Leaves of a narrower shape, entire, tapering toward the base --64.

64a. Principal leaves 2-3 cm. long 1a, in =ONAGRACEAE=, p. 78.

64b. Principal leaves 1 cm. long or less --65.

65a. Petals present =ELATINACEAE=, p. 74.

65b. Petals none =CALLITRICHACEAE=, p. 68.

--66--

66a. Plants of the composite type, with several or many small
flowerets closely aggregated into a dense head surrounded or
subtended by a calyx-like involucre of small bracts --67.

66b. Flowers solitary or variously clustered, but not in involucred
heads --70.

67a. Involucre of 4 conspicuous white bracts, much larger than the small
flower-cluster 4a, in =CORNACEAE=, p. 83.

67b. Involucral bracts green or somewhat colored --68.

68a. Stem more or less prickly =DIPSACACEAE=, p. 112.

68b. Stem and leaves not prickly --69.

69a. Stem square; foliage aromatic when crushed =LABIATAE=, p. 95.

69b. Stem not square; foliage not with the odor of mint
=COMPOSITAE=, p. 113.

70a. The conspicuous portion of the perianth[1] composed of
separate parts --71.

70b. The conspicuous portion of the perianth[1] composed of united
parts --97.

71a. Stem-leaves compound, or cleft to the very base --72.

71b. Stem-leaves simple --78.

72a. Stamens more than 10 in each flower --73.

72b. Stamens 5-10 in each flower --75.

73a. Ovary 1 in each flower 2a, in =PAPAVERACEAE=, p. 41.

73b