xxxiii 



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 midvein 



44a. Stamens 5 PRIMULACEAE, p. 87. 



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



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

 45b. Leaves beset on the upper side with long glandular hairs; bog 



plant with flowers in racemes BROSERACEAE, p. 48. 



45c. Leaves flat, pubescent or smooth, but not with long glandular 



hairs 46. 



46a. Sepals and petals each 4 53, in CRUCIFERAE, p. 46. 



46b. Sepals and petals each 5 47. 



46c. Sepals 6; petals none; flowers minute, green; leaves fre- 

 quently lobed at the base 4, in POLYGONACEAE, p. 25. 



47a. Petals united with each other in an irregular corolla 



LENTIBULARIACEAE, p. 105. 

 47b. Petals separate from each other 48. 



48a. Stamens 10; style 1 ERICACEAE, p. 84. 



48b. Stamens 5 or 10; styles 2 SAXIFRAGACEAE, p. 49. 



48c. Stamens and pistils each very numerous 49. 



49a. Flowers white 64a, in ROSACEAE, p. 56. 



49b. Flowers yellow 13a, in RANU1SCULACEAE, p. 36. 



50 



50a. Leaves compound or deeply lobed 51. 

 50b. Leaves entire or toothed 54. 



51a. Flowers in axillary racemes, spikes, or panicles 



URTICACEAE, p. 23, 



51b. Flowers terminal, or in terminal clusters 52. 



52a. Flowers in umbels; leaves palmately compound 



ARALIACEAE, p. 80. 



52b. Flowers in racemes or spikes, or solitary 53. 



