xxxi 



13a. Flowers irregular, in dense head-like umbels 



37a, in LEGUMItfOSAE, p. 61. 



13b. Flowers consisting of a greenish or purplish bract wholly or 

 partly enclosing a fleshy spike 2, in ARACEAE, p. 8. 



13c. Flowers regular, solitary or in loose clusters 14. 



14a. Leaflets reverse heart-shape, not over 2 cm. long 



OXALIDACEAE, p. 64. 

 14b. Leaflets 410 cm. long Ic, in GENTIANACEAE, p. 88. 



15a. Flowers with colored or white petals and green or colored sepals 



16. 



15b. Flowers with one kind of perianth only (calyx), with broad and 



petal-like parts 32, in RANUNCULACEAE, p. 38. 



15c. Flowers with white petal-like sepals and small inconspicuous 



petals 38b, in RANUNCULACEAE, p. 39. 



16a. Petals and sepals each 4 31, in CRUCIFERAE, p. 44. 



16b. Petals and sepals each 5 or more 17. 



17a. Leaves with stipules ROSACEAE, p. 51. 



17b. Leaves without stipules 23b, in RANUNCULACEAE, p. 37. 



18 

 18a. Stem-leaves a single opposite pair (basal leaves may also 



be present) 19. 

 18b. Stem-leaves none 23. 



19a. Leaves entire 20. 



19b. Leaves toothed or lobed 21. 



20a. Flowers solitary; leaves broadly kidney-shape 



' ARISTOLOCHIACEAE, p. 25. 

 20b. Flowers in racemes; leaves linear or lanceolate 



PORTULACACEAE, p. 34. 



21a. Flowers in racemes; petals deeply toothed 



23b, in SAXIFRAGACEAE, p. 51. 



21b. Flowers solitary or few in a cluster; petals entire or nearly so 



22. 



22a. Petals 5 GERANIACEAE, p. 64. 



22b. Petals 6 or more 2b, in BERBERIDACFAE, p. 40. 



23a. Flowers or flower-clusters sessile, at or partly beneath the sur- 

 face of the ground 4a, in ARACEAE, p. 8. 



23b. Flowers or flower-heads solitary at the ends of the flower-stalks 

 24. 



Flowers or flower-heads numerous or several on each flower- 

 stalk 38. 



24a. Flowers yellow 25. 

 24b. Flowers not yellow 29. 



