314 
IOWA ACADEMY OF SCIENCE Voi.. XXVIII, 1921 
103. 
103. 
105. 
105. 
107. 
107. 
109. 
109. 
111 . 
111 . 
111 . 
113. 
113. 
115. 
115. 
117. 
117. 
117. 
119. 
119. 
121 . 
121 . 
Stam. 5-10, separate Oxalidacese 
Stam. many, their stalks united into a tube Malvaceae 
104. One or two pet. sac-like; stam. 6, in 2 sets Fumariaceae 
104. FI. sweet-pea shaped; stam. 10, their stalks 
united Eeguminosae 
104. Stam. 4-8, in 1 or 2 groups ; pet. 3 Polygalaceae 
Styles 5 : fl. pink or white 
Style 1 ; fl. yellow or pink 
Plumbaginaceae 
Primulaceae 
106. Corolla lobes all alike (regular) 107 
106. Corolla lobes different from one another 122 
Stam. as many as corolla lobes 108 
Stam. fewer than corolla lobes 118 
108. Ov. 2 : stig. often united 109 
108. Ov. deeply 4-lobed 110 
108. Ov. 1, not deeply lobed 111 
Stam. not united, often touching Apocynaceae 
Stam. united with each other and with stigma Asclepiadaceae 
1 10. Evs. alternate 
110. Evs. opposite 
Borraginaceae 
Eabiat^ 
Evs. entire, all from the ground; fls. 
spikes; corolla small, dry and hard 
Evs. some or all on the stem 
Eeafless, yellow, twining parasite 
in narrow 
Plantaginaceae 
112 
Hi. jConvolvulaceae 
112. Ov. 1-celled 113 
112. Ov. 2-10 celled; herbs with stam. on tube of 
■corolla 114 
Evs. entire, perfectly smooth 
Evs. lobed or compound, hairy 
114. Stam. 4; Ivs. opposite 
114. Stam. 5, or rarely more 
Fr. 2-6 seeded 
Fr. many-seeded, dry or juicy 
116. 
116. 
Twining vines; corolla showy 
Not twining 
Fl. white, solitary, 4-5 cm. long; stig. 
Fl. 1-2 cm. long, in groups ; stig. 3 
Fl. 0.5-2 cm. long, in groups ; stig. 2 
118. Stam. 4, in pairs 
118. Stam. 2 
Gentianaceae 
Hydrophyllaceae 
Verbenaceae 
115 
116 
Solanaceae 
Convolvulaceae 
117 
Convolvulaceae 
Polemoniaceae 
Hydrophyllaceae 
119 
120 
Corolla blue, the tube 2.5-4 cm. long; ov. many 
seeded Acanthaceae 
Corolla tube 2-10 mm. long; ov. 2-4 seeded Verbenaceae 
120. Ov. deeply 4-lobed Eabiatae 
120. Ov. 2-celled, not 4-lobed 121 
Herbs with leafy stem 
Trees or shrubs 
Scrophulariaceae 
Oleaceae 
122. Stam. with anthers 5, attached to corolla 123 
122. Stam. with anthers 2 or 4 124 
