xliii 



169a. Stamens with ordinary visible anthers; ovary 1 170. 

 169b. Stamens so grown together and to the stigma as to be almost 

 unrecognizable; ovaries 2 ASCLEPIADACEAE, p. 90. 



170a. Petals separate PAPAVEEACEAE, p. 41. 



170b. Petals united 171. 



171a. Stamens attached to the tube of the corolla 



CONYOLYULACEAE, p. 91, 

 171b. Stamens attached at the very base of the corolla 



CAMPANTJLACEAE, p. 112. 



172a. Plants of the composite type, with several or many small 

 flowerets closely aggregated into dense heads subtended by a 

 calyx-like involucre of small bracts 173. 



172b. Flowers solitary or clustered, but not in involucred heads- 



174. 



173a. True composites, without a normal calyx 



COMPOSITAE, p. 113. 



173b. A normal calyx with each floweret; leaves compound with 3 

 leaflets LEGUMINOSAE, p. 58. 



174a. Flowers irregular, i. e., the conspicuous lobes of the 



perianth unlike in size or shape 175. 

 174b. Flowers regular 185. 



175a. Stamens 2 or 4 SCROPHTJLARIACEAE, p. 101. 



175b. Stamens 5 176. 



175c. Stamens 6 181. 



175d. Stamens 8; leaves simple POLYGALACEAE, p. 65, 



175e. Stamens 10; leaves usually compound LEGUMBTOSAE, p. 58, 



175f. Stamens more than 10 183. 



176a. Petals separate 177. 

 176b. Petals united 179. 



177a. Flowers greenish or purplish, in a panicle 



SAXIFRAGACEAE, p. 49. 

 177b. Flowers white or purplish, in compound umbels 



UMBELLIFERAE, p. 80. 



177c. Flowers solitary, or in few-flowered clusters 178. 



178a. Flowers blue, yellow, or white, in spring 



YIOLACEAE, p. 75. 

 178b. Flowers red-orange or yellow, in summer 



BALSAMINACEAE, p. 71. 

 178c. Flowers small and greenish, in spring 



la, in YIOLACEAE, p. 75. 



