KEY TO THE FAMILIES. 



13 



32. 

 32. 

 32. 

 32. 



34. 

 34. 



3t». 

 36. 



3S. 



3v 



40. 

 40. 

 40. 

 10 



42. 



44. 



41. 



46. 

 46. 



48. 

 18. 



31. Fruit a capsule opening by valves. 66 Alsinaceae 



31. Fruit a capsule opening at the top. 81 Penthoraceae 



31. Fruit a berry. ------- 61 Phytolaccaceae 



Fruit a samara; trees, ------- 107 Aceraceae 



Fruit a berry, sometimes with scant pulp; flowers small; vines. 110 Vitaceae 

 Fruit fleshy, berry-like; flowers showy; vines. - - - 118 Passifloraceae 

 Fruit a capsule. --------64 Tetragonaceae 



33. Shrubs or trees, dioecious. ----- 131 Nyssaceae 



33. Herbs or shrubs with flowers in small involucrate heads 172 Ambrosiaceae 

 33. Plants with flowers perfect. --------34 



Fruit a capsule. -----------35 



Fruit a berry, or a drupe, or dehiscent, ------ 36 



35. Calyx 4-lobed. herbs ------ 129 Epilobiaceae 



35. Calyx corolla-like, herbs or woody vines with flowers variously 



inflated, _--___-_ i$8 Asaraccae 



35. Calyx margined, herbs sometimes shrubby, - - 64 Tetragoniaceae 

 Aquatic herbs; fruit bony, splitting into 2 or 4 nutlets, - 130 Gunneraceae 

 Herbs or trees; fruit dehiscent or a berry, - - - - 127 Myrtaceae 



37. Carpels one. or more than one and distinct or united only at the 



base (ovary simple or multiple, apocarpous) 38 



37 Carpels more than one and united (ovary compound, syncarpous) - 47 



Stamens hypogynous, ----------39 



Stamens perigynous or epigynous, ------- 45 



39. Flowers in corymbose panicles; shrubs or small trees, - 98 Rutaceae 

 39. Flowers monoecious, in heads; trees, 86 Platanaceae 



39. Flowers not monoecious, --------40 



Saprophytes or root-parasites, ----- 134 Monotropaceae 



Succulent herbs, not parasitic, ------ 80 Sedaceae 



Waterplants with floating peltate leaves, - - - - - - -41 



Plants different from the preceding ones, ------ 42* 



41. Sepals and petals 3 each, stamens 3-18, - - - 72 Cabombaceae 

 41. Sepals, petals and stamens numerous, 73 Nelumbonaceae 



Flowers papilionaceous; fruit a legume or loment, - - 93 Fabaceae 



Flowers not papilionaceous, --------- 43 



43. Shrubs, vines or trees, evergreen or deciduous, fruit a follicu- 

 lar cone, --------71 Magnoliaceae 



43. Herbs, shrubs or small trees, deciduous, fruit a legume, berry 



or capsule, -----------44 



Sepals 3, petals 6, stamens numerous, fruit berry-like, - 70 Anonaceae 



Sepals and petals 5 each, stamens 5 or 10, fruit a legume, - 92 Cassiaceae 



Sepals, petals and stamens numerous, fruit a capsule, - 88 Calycanthaceae 



Leaves opposite, simple, without stipules. - - 82 Escalloniaceae 



ives alternate, - - - - - - - - - -46 



Leaves simple, without stipules, styles 2, - - - - 84 Iteaceae 



Leaves simple, stipules deciduous, style 1, - - - 90 Amygdalaceae 

 Leaves compound, or at least lobed, with stipules, - - 87 Rosaceae 

 !7 Ovary superior. - - - -- _--- - - [£ 



47 Ovary inferior. -----------71 



Stamens hypogynous, - - -- -----49 



Stamens perigynous or epigynous. - - -----63 



49. Stamens more than twice the number of petals, 50 



49. Stamens more than petals, sometimes twice the number, - - M 



