XVI 
Spring Flora of Oklahoma 
8b. Ovary 4-lobed around the style; herbs usually 
with aromatic leaves. 
77. LABIATE. 150 
6b. Corolla regular; trees or shrubs with opposite 
leaves. 67. OLEACEiE. 130 
3b. Corolla scarious, nerveless; herbs with small flowers in 
spikes or heads. 82. PLANTAGINACEZE. 168 
B. Flowers epigynous. 
la. Flowers not in involucrate heads. 
2a. Leaves alternate. 
3a. Vines with tendrils; flowers monoecious or dioecious; leaves 
palmately lobed or veined ; stamens 3 or less. 
86. CUCTJRBITACE^E. 177 
3b. Herbs with milky sap, not vines; flowers regular; stamens 
5. 87. CAMPANULACEiE. 178 
3c. Herbs with milky sap, not vines; flowers irregular; sta¬ 
mens 5. 88, LOBELIACEJE. 180 
2b. Leaves opposite or whorled. 
3a. Stamens 1-3, fewer than the lobes of the corolla; ovary 
1-celled with 1 ovule or 3-celled with 2 empty cavities; 
leaves without stipules. 
85. VALERIANACEiE. 176 
3b. Stamens as many as the lobes of the corolla ; leaves with 
stipules or in whorls without apparent stipules, 
83. RUBIACE^E. 171 
3c. Stamens as many as the lobes of the corolla; leaves usu¬ 
ally without stipules. 
84. CAPRIFOLIACEzE. 173 
lb. Flowers in involucrate heads; ovary 1-celled. 
2a. Flowers all ligulate; sap milky. 
89. CHICORIACEiE. 180 
2b. Flowers all tubular; or the outer expanded into rays; sta¬ 
mens united by their anthers into a tube around the style; 
sap very rarely milky. 
90. COMPOSITE. 
185 
