59(57). Erect herbs with merely opposite leaves and a pungently fetid odor (like 

 that of a wet dog) 126. Valerianaceae, p. 1562 



59. Erect or often trailing herbs with whorled leaves and not strongly odoriferous 



(genus Galium of) 124. Rubiaceae, p. 1538 



60(56). Pistils several, free from each other 61. Ranunculaceae, p. 913 



60. Pistil solitary (61) 



61(60). Seeds (or ovules) campylotropous, with embryo curved around the 

 periphery surrounding the perisperm or endosperm (62) 



61. Seeds not as above (64) 



62(61). Seeds solitary 53. Amaranthaceae, p. 857 



62. Seeds several to numerous (63) 



63(62). Stamens more numerous than sepals 56. Aizoaceae, p. 870 



63. Stamens as many as the sepals 58. Caryophyllaceae, p. 884 



64(61). Branches of inflorescence scorpioid (genus Penthorum of) 



70. Saxifragaceae, p. 999 



64. Branches of inflorescence (if any) not scorpioid (65) 



65(64). Leaves pinnately compound (genus Fraxinus of) 



106. Oleaceae, p. 1301 



65. Leaves simple (66) 



66(65). Ovary 1-celled; stigma solitary; stamens 2 to 5 50. Urticaceae, p. 788 



66. Ovary usually 3-celled; stigma usually more than 1; stamens usually more 



■than 5 78. Euphorbiaceae, p. 1082 



67(55). Stamen solitary; leaves opposite; low-growing subaquatics or aquatics; 

 perianth absent 79. Callitrichaceae, p. 1085 



67. Stamens more numerous or if only 1 then the leaves alternate or else the 



plants woody; calyx often present (68) 



68(67). Oarpels several, distinct 61. Ranunculaceae, p. 913 



68. Carpels (when more than 1) united at least at their bases (at least at anthesis) 



(69) 



69(68). Ovary completely inferior as shown by micro- or macroscopic scales or 

 sepals at top (use strong lens) and/or in some taxa by stamens at 

 the very top of the ovary (70) 



69. Ovary superior or at least half-superior (75) 



70(69). Plants herbaceous (71) 



70. Plants woody; fruit a nutlike structure (72) 



71(70). Ovary of several folliclelike structures partially or almost wholly im- 

 mersed in the inflorescence axis and associated floral tissue (genus 

 Anemopsis of) 42. Saururaceae, p. 734 



71. Ovary not as in Anemopsis 98. Umbelli ferae, p. 1211 



72(70). Nut subtended by a cupule of more or less consolidated bracts 



48. Fagaceae, p. 783 



72. Nut not having a basal cupule of bracts (73) 



73(72). Leaves compound 46. Juglandaceae, p. 769 



73. Leaves simple (74) 



29 



