5o8 The Ohio Naturalist. [Vol. XII, No. 6, 



23. Fruit or the peduncle prominently winged. 2-i. 



23. Fruit and peduncle not with wings. 30. 



24. Peduncle of the fruit cluster with a large wing; fruit a dry 



drupe. Tilia. 



24. Peduncle not winged; fruit a true samara, or with 1 or more 

 ~ prominent wings. 25. 



25. Fruit with a prominent spine-like beak at the tip and with 



2 or 4 wings, large. Mohrodendron. 

 25. Fruit not with a prominent spine-like point. 26. 

 2C. Fi*uit double with 2 cavities and 2 large wnngs. Acer. 

 26'. vSamara with a wing all around or with a single wing at the 



end. 27. 

 27. Samara circular, oval, or broader than long. 28. 



27. Samara elongated. 29. 



28. Wing extending around the fruit, very veiny, glabrous; long- 



peduncled, calyx not present or very inconspicuous; 

 cavities 2, 1 usually empty. Ptelea. 

 28. Wing notched at the apex, usually veiny; fniit long-pedun- 

 cled, calyx present ; cavity 1 w4th 1 seed. Ulmus. 



28. Wing on the two sides of the fruit, with 2 stigmas at the apex; 



fruit sessile, small. Betula. 



29. Wing extending as far Ijelow the central seed as beyond it. 



Ailanthus. 



29. Wing terminal or extending along the sides of the seed but 



not beneath it. Fraxinus. 



30. Fruit a dehiscent bean, follicle, or capsule, usually with 



several seeds. 31. 



30. Fruit an indehiscent nut, achene, or dry drupe with 1 cavity 



and 1 seed; often partly or completely enclosed in a cup 

 or husk. 47. 



31. Fruit a bean or legume with 1 cavity and 2 sutures; seeds 



not winged. 32. 



31. Fruit a capsule; if bean-like then with 2 cavities. 35. 



32. Bean an inch or more broad, mostly with pulp. 33. 



32. Bean about }/2 in. broad, without pulp. 34. 



33. Bean very hard and thick, seed % in. long. Gymnocladus. 



33. Bean not very woody, thin, seed less than I'o in. long. 



Gleditsia. 



34. Bean with a prominent ridge on each side of one suture, 



apex long-acute. Cercis. 

 34. Bean with the 2 sutures nearly alike, apex mucronate, or with 



a slender point, sometimes bristly. Robinia. 

 34. Bean usually irregular and somewhat constricted into joints, 



apex abruptly acute, calyx containing long filaments. 



Cladrastis. 

 2>o. Seed with wings or a tuft of cottony hairs. 30. 



