KEY 



PAGE 



Flowers not in catkins ; calyx present, sometimes petal-like. 

 Trees or shrubs. 



Flowers not hypogynous ; plants not climbing . . 73. Dogwood . . . 162 

 Flowers not hypogynous ; climbing plants .... 24. Dutchman's Pipe 64 



Flowers hypogynous. 

 Style single, not cleft, fruit a key. (Fraxinus) . 78. Olive ..... 175 



Style single, not cleft, fruit a stone-fruit .... 37. Laurel ..... 88 



Styles 2 or 2-cleft, fruit 1-celled ....... 19. Elm ...... 59 



Styles 2 or 2-cleft, fruit 2-celled ....... 58. Maple ..... 140 



Styles 3, each 2-cleft. Ovary 3-celled ..... 53. Spurge . . . .135 



Herbs. 

 Flowers not hypogynous ; ovary 6-celled ..... 24. Dutchman's Pipe 64 



Flowers not hypogynous ; ovary 1-celled ; flowers in 

 umbel-like clusters ...... | ..... 23. Sandal wood . . 64 



Flowers hypogynous ; ovary 1-celled. 

 Stamens many ..... -. . ....... 32. Buttercup ... 77 



Stamens few. 

 Stipules sheathing the joints ........ 25. Buckwheat ... 66 



Stipules wanting. 

 Rather fleshy herbs ........... 26. Goosefoot ... 68 



Not fleshy. 



Ovules on a free central placenta ; delicate, 

 soft-leaved herbs. (Stellaria) ..... 30. Pink ..... 71 



Ovule single. Tough, with awl-shaped leaves. 

 (Scleranthus) ........... 30. Pink ..... 71 



Ovary several-celled. 

 Small prostrate herb ; leaves spatulate, whorled . 28. Ice-plant .... 69 



Stipules present, not sheathing. 

 Style single .............. 21. Nettle ..... 62 



s *y les 2 ............... 20. Mulberry ... 61 



Flowers hypogynous, ovary 3-celled ...... 53^ Spurge . .135 



Flowers hypogynous, ovary 5-10-celled ; fruit a berry 27. Pokeweed ... 69 



II. PolypetalOUS Division. Calyx and corolla both present, the petals not united. 



A. 



Stamens more than 10. 



Trees, shrubs, or woody vines. Leaves alternate. 

 Ovary 1, simple. 

 Fruit a stone-fruit ........... 45. R ose m 195 



