xxxvi 



Sla. Stem prostrate; flowers only 2 mm. broad AIZOACEAE, p. 31. 

 81b. Stem erect; flowers at least 20 mm. wide 



4a, in CORXACEAE, p. 83. 



82a. Petals 2 or 4 83. 



82b. Petals 3 22, in LILIACEAE, p. 12. 



82c. Petals 5 or 6 84. 



83a. Leaves with 35 principal veins MELASTOMACEAE, p. 77. 

 83b. Leaves with 1 principal midvein ONAGRACEAE, p. 78, 



84a. Leaves palmately lobed 85. 



84b. Leaves entire or toothed, or with 1 2 small lobes near the 

 base only 86. 



85a. Petals entire or notched at the end GERANIACEAE, p. 64. 

 85b. Petals conspicuously fringed 23b, in SAXIFRAGACEAE, p. 51. 



86a. Ovary 1 87. 



86b. Ovaries 2, surrounded and concealed by other organs 



ASCLEPIADACEAE, p. 90. 

 86c. Ovaries 45 2b, in CRASSULACEAE, p. 48. 



87a. Leaves dotted with translucent dots (easily seen when the leaf 

 is held to the light) HTPERICACEAE, p. 73. 



87b. Leaves not dotted with translucent dots 88. 



88a. Leaves only 1 3 mm. long, closely appressed and con- 

 cealing the stem 2a, in CISTACEAE, p. 74. 

 88b. Leaves larger, not concealing the stem 89. 



89a. Style 1 or none 90. 

 89b. Styles 2 to 7 94. 



90a. Stamens 5 91. 



90b. Stamens 10 92. 



90c. Stamens neither 5 nor 10 93. 



91a. Flowers blue, sessile in terminal spikes with leaf-like bracts 



LYTHRACEAE, p. 77. 

 91b. Flowers not in terminal bracted spikes PRIMTJLACEAE, p. 87. 



92a. Leaves entire LYTHRACEAE, p. 77. 



92b. Leaves toothed or crenate ERICACEAE, p. 84. 



93a. Flowers irregular; petals 3 POLYGALACEAE, p. 65. 



93b. Flowers regular; petals 5 or more LYTHRACEAE, p. 77. 



94a. Sepals 2, partly attached to the ovary 



PORTULACACEAE, p. 34. 



94b. Sepals 5, free from the ovary 95. 



95a. Stamens 5 96. 



95b. Stamens not 5 CARYOPHYLLACEAE, p. 31. 



96a. Flowers blue or yellow LDTACEAE, p. 63. 



96b. Flowers white or pinkish CARYOPHYLLACEAE, p. 31. 



