88(76). Embryo curved, occupying the periphery of the rounded ovule and 

 surrounding the perisperm and/ or endosperm (go back to couplet 

 79). 



88. Embryo not as above (89) 



89(88). Leaves opposite (90) 



89. Leaves alternate (91) 



90(89). Fruit a drupe or a simple samara 106. Oleaceae, p. 1301 



90. Fruit a double samara, with the seed-bearing bases connate and the 2 blades 



diverging as in maple fruit 84. Aceraceae, p. 1104 



91(89). Seeds numerous, each surrounded by a basal coma of hairs 



43. Salicaceae, p. 737 



91. Seeds often 1 or few, with coma absent (92) 



92(91). Androecium of 4 series, each series of 3 stamens whose anthers open 

 by 2 or 4 uplifting valves, often an additional 3 staminodia pres- 

 ent 63. Lauraceae, p. 961 



92. Androecium otherwise, usually the stamens fewer than 12; anther dehiscence 



usually by longitudinal slits (93) 



93(92). Flowers perfect or unisexual with both sexes on the same plant, solitary 

 or in few-flowered fascicles; calyx 4- or 5-merous; fruit a samara, 

 a roundish drupe or a nutlike structure 49. Ulmaceae, p. 788 



93. Flowers unisexual, usually with male and female flowers on separate plants 



or sometimes on the same plant, in small spikes or aments; calyx 

 absent at least in staminate flowers; fruit either a small wax-coated 

 sphere or an elongate drupe (94) 



94(93). Fruit a small wax-coated sphere; leaves subpersistent, usually toothed or 

 lobulate above the middle 44. Myricaceae, p. 767 



94. Fruit an elongate leathery-skinned drupe; leaves deciduous, usually entire- 



margined 45. Leitneriaceae, p. 769 



95(52). Ovary inferior or mostly so (96) 



95. Ovary superior or mostly so (here also see Nelumbo of the Nyphaeaceae 



whose separate ovaries are mostly immersed in the receptacle and 

 Euonymus in the Celastraceae in which the massive disk may 

 appear to adhere lightly to the side of the ovary) (102) 



96(95). Fruit consisting of 2 achenelike mericarps which at maturity separate 

 from each other and from the receptacle. ...98. Umbelliferae, p. 1211 



96. Fruit otherwise (97) 



97(96). Embryo curved, forming the periphery of the roundish or disklike ovule, 

 surrounding the perisperm and/ or endosperm (go back to couplet 

 83). 



97. Embryo and ovule otherwise (98) 



98(97). Fruit a pome 73. Rosaceae, p. 1015 



98. Fruit not a pome or if resembling one then seeds numerous (99) 



99(98). Fruit a drupe 99. Cornaceae, p. 1262 



99. Fruit a berry, capsule or follicetum (100) 



31 



