Spring Flora of Oklahoma 
xi 
4b. Stamens 2 or 8, style 1, stigma 2-4 lobed. 
62 ONAGRACEiE. 115 
B. Only the calyx present, sepals distinct or united, green or colored, 
la. Trees, shrubs, or woody climbers. 
2a. Leaves opposite or whorled. 
3a. Not climbing. 
4a. Trees or shrubs with pinnate leaves and fruit a samara, 
or leaves simple with fruit a drupe. 
67. OLEACE^E. 130 
4b. Trees with a 2-celled ovary, forming a 2-winged, 2- 
seeded fruit. 51. ACERACE.E. 100 
4c. Shrubs parasitic on trees. 
15. LORA NTH ACE/E. 33 
3b. Climbing, more or less woody vires; stamens numerous; 
achenes with long, persistent styles. 
35. RANUNCULACEiE. 44 
2b. Leaves alternate. 
3a. Leaves compound. 
4a. Trees with odd-pinnate leaves; fruit a nut inclosed in a 
husk. 9. JUGLANDACEiE. 16 
4b. Shrubs or trees with pinnate or trifoliate, punctate 
leaves. 44. RUTACEiE. 87 
4c. Trees or shrubs with compound leaves, evenly pinnate 
or bi-pinnate. 33. FABACEZE. 70 
3b. Leaves simple. 
4a. Trees; flowers in dense, spherical heads, the pistillate 
on a long, slender peduncle; twigs with stipular rings. 
33. PLATANACEJE. 61 
4b. Twigs not with stipular rings. 
5a. Flowers epigynous; stamens 5-15; ovary 1-celled. 
64. CORNACEiE. 126 
5b. Flowers liypogynous. 
6a. At least one kind of flowers in aments or ament¬ 
like clusters; fruit a nut with a bur or cup; or 
more or less fleshy and aggregate. 
7a. Sap milky, fruit aggregate and fleshy, flowers in 
ament-like spikes or heads. 
14. MORACE^E. 31 
7b. Sap not milky, fruit a large or small nut. 
8a. Fruit a nut with a bur or cup. 
12. FAGACEAE. 22 
8b. Fruit a small nut, flowers in aments. 
11. BETULACEiE. 
6b. Flowers not in aments. 
21 
