312 
IOWA ACADEMY OF SCIENCE 
Voh. XXVIII, 1921 
68. Stam. united with the thick united stig. 
68. Stam. free from each other and from the 
Asclepiadaceae 
pist. 
69 
69. 
Stam. on the axis of the fl., not on the calyx 
70 
69. 
Stam. attached to calyx 
72 
70. Lvs. very thick, fleshy 
Crassulaceae 
70. Evs. thin, with fine transparent dots 
Rutacese 
70. Evs. thin, not dotted 
71 
71. 
Trees; lvs. pinnate, large 
Simarubaceae 
71. 
Herbs; ov. several, each with stig. 
Ranun culaceje 
71. 
Herbs ; style 1 ; stig. and ov. 5-lobed 
Geraniaceae 
72. Stipules present 
Rosaceae 
72. Stipules absent 
Saxifragaceae 
73. 
FIs. radially symmetrical, the petals all alike, and 
sepals all alike 
74 
73. 
FIs. 2-sided, the petals unlike, or sepals unlike, or 
reduced in number 
89 
74. Trees, shrubs, or woody vines 
75 
74. Herbs 
81 
75. 
Evs. alternate 
76 
75. 
Evs. opposite 
78 
76. Woody vines 
77 
76. Shrubs with pinnately compound lvs. 
Anacardiaceae 
77. 
Evs. simple 
Celastraceae 
77. 
Evs. of 3 If Its. ; poisonous to touch 
Anacardiaceae 
78. Trees of large size 
80 
78. Shrub or small tree (to 3 cm. thick) 
79 
79. 
Evs. undivided, oval 
Celastraceae 
79. 
Evs. of 3 Iflts. 
Staphyleaceae 
80. Evs. pinnately compound 
Eeguminosae 
80. Evs. not compound 
Aceraceae 
81. 
White, leafless saprophyte, 10-20 cm. tall 
Ericaceae 
81. 
Green plants rooting in ordinary fashion 
82. Evs. with fine transparent dots, as if punc- 
82 
tured 
Hypericaceae 
82. Evs. not transparent-dotted 
83 
83. 
Sepals all separate from each other 
84 
83. 
Sepals united at base into a cup 
87 
84. Ov. 1 -celled 
85 
84. Ov. 5 or 10-celled 
86 
85. 
Seeds in two rows on sides of ov. ; lvs. alternate 
Capparidaceae 
85. 
Seeds on a free column at center of ov. ; lvs. op- 
posite 
Caryophyllaceae 
86. Evs. narrow, entire 
Einaceae 
86. Evs. of 3 notched Iflts. 
Oxalidaceae 
86. Evs. large, lobed and toothed, hairy 
Geraniaceae 
86. Evs. round or oval, finely toothed 
Ericaceae 
