132 FiKLU Manual 



L'(i. Fruit double with J cavities and 2 large wings. 



Acer. (41). 

 ■JH. Samara with a wing all around or with a single wing" 



at the end. 27. 

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



27. Samara elongated. 2!». 



-2S. Wing extending around the fruit, very veiny, glabrous ; 

 long-peduncled, calyx not present or very incon- 

 spicuous; cavities 2, 1 usually empty. Ptelea. (18). 



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



jieduncled, calyx present ; cavity with 1 seed. 



Ulmus. (48). 



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



at the apex; fruit sessile, small. Betula. (59). 

 20. Wing extending as far below the central seed as 

 beyond it. Ailanthus. (19). 



29. Wing terminal or extending along the sides of the 



seed but not beneath it. Fraxinus. (74). 



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 1-2 seeds; often partly or completely en- 

 closed 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 witli 2 cavities. 35. 



32. Bean an inch or more broad, mostly with ])ulp. 3;*>. 



32. Bean about •] in. broad, without pulp. 34. 



33. Bean very hard and thick, seed T in. lf)ng. 



Gymnocladus. (31). 



33. Bean not very woody, thin, seed less than h in. 



long. Gleditsia. (30). 



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



suture, apex long-acute. Cercis. (25). 

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



or with a slender point, sometimes bristly. 



Robinia. (33). 

 •'54. Bean usually irregular and somewhat constricted intf) 



joints, apex abruptly acute, calyx containing long 



filaments. Cladrastis. (32). 

 ■ \'k Seed with wings or a tuft of cottony hairs. 36. 



