122(121). Tree with opposite palmately lobed leaves on long slender reddish 



petioles; fruit of geminate samaras (Acer rubrum of) 



84. Aceraceae, p. 1104 



122. Character combination not as above (123) 



123(122). Shrub or tree with alternate simple stipulate leaves; flowers usually 

 perfect, small, borne in small axillary pedunculate clusters or 

 heads, with 3 each of sepals, petals, stamens and staminodes and 

 2 long styles; capsule bivalvate, opening loculicidally from the top; 

 seed 1 in each cell 71. Hamamelidaceae, p. 1011 



123. Character combination not as above (124) 



114(123). Ovary with a slender axis 1-5 cm. long, at the base of which are 5 

 small cells, each with 2 ovules; at maturity when dry the cells 

 suddenly separating from the axis and coiling up on their styles 



which are also adnate to the full length of the axis 



75. Geraniaceae, p. 1071 



124. Character combination not as above (125) 



125(124). Pistil simple, folliclelike with a single style and stigma and a single 

 ventral placenta 74. Leguminosae, p. 1039 



125. Pistil not simple as shown by 2 or more stigmas, 2 or more cells, or 2 or 



more placentae (126) 



126(125). Flowers unisexual; carpels 3; fruit usually a capsule and usually with 

 a well-developed central axis (columella) which persists after 

 dehiscence; ovules 1 or 2 in each of the 1, 2 or usually 3 cells, 



attached to an apical-axial (columellar) placenta 



78. Euphorbiaceae, p. 1082 



126. Flowers usually bisexual; carpels 2 to 10, if 3 then character combination 



not as above (127) 



127(126). Herbs with alternate palmately compound leaves (rarely reduced to 1 

 leaflet); flowers hypogynous, often somewhat bilaterally symmetri- 

 cal; stamens 6 to 27 or more, as long as or usually longer than the 

 petals; ovary borne on a slender gynophore (rarely nearly sessile), 

 1 -celled (2-celled in Wislizenia) , usually capsular with 2 valves and 

 many seeds 65. Capparidaceae, p. 987 



127. Character combination not as above (128) 



128(127). Petals and stamens either definitely perigynous, i.e., inserted in a 

 floral cup or "calyx tube" or very slightly epigynous (the cup at- 

 tached to the very basal part of the ovary) (129) 



128. Petals and stamens hypogynous (rarely very slightly or obscurely perigynous 



as in some Celastraceae) (132) 



129(128). Leaves opposite; hypanthium urceolate; petals 4, fugacious, rose-color 

 to purple (rarely white or yellow); stamens 8, basally appendicu- 



late; anthers dehiscing by apical pores 



94. Melastomataceae, p. 1169 



129. Character combination not as above (130) 



130(129). Herbs; leaves mostly basal; ovary very shortly at base adnate to a 

 floral cup; stigmas 4; capsule 1 -celled, 4-valved; stamens 5, plus 

 5 staminodes (genus Parnassia of) 70. Saxifragaceae , p. 999 



130. Ovary superior; style 1, 2, 3 or 5, never 4; stamens 4 to numerous (131) 



34 



