ASH : AILANTHUS 101 



)f fertilization of a single flower, the apocarpous pistils of 

 vhich have developed into achenes, each' fccppetT % the 

 Dersistent style that has grown out mto a plumose fila- 

 nent. The only similar arrangement in ou-: fl oca exists 

 n certain herbaceous Anemones and Potentillas. 



ft Fruits not aggregated in heads, catkins, &c. 



Fruit a samara, winged by forward or [For (00) 

 lateral prolongation of the carpel into a see ? 103. ] 

 membrane. 



l~l Wing long and narrow, prolonged forwards 

 only, with the seed at its base. 



Fraxinus excelsior, L. Ash (Fig. 18). Winged fruit 

 ibout 40 x 8 mm. ; the wing leathery, smooth, tawny, 

 3uneate-oblong rounded above, with numerous more or 

 .ess parallel veins ; seed nearly half as long as the whole 

 ? ruit, flat, cuneate-oblong, longitudinally striate. Pedicel 

 md remains of floral axis present at the base. 



OO Wing prolonged in more than one 

 direction, with the seed near the middle. 



Wing elongated, asymmetrical, notched 

 on one side near the middle. 



Ailanthus glandulosa, Desf. Tree of Heaven (Fig. 19). 

 Ihe fruit is about 25 x 10 mm. long, flat, thin, tawny, and 

 irregularly oblong and veined : the lateral notch is due to 

 ,ack of growth at the point of attachment of the seed. 

 Ihe wing is usually twisted above. Each flower gives 

 rise to several, about three, fruits. 



Wing broad oval to sub-orbicular, 

 notched at the top; remains of peri- 

 gone persisting beloiv. 



$ Seed in the middle of the broadly 

 oval samara. 



Ulmus montana, Sm. Wych Elm (Fig. 98). Fruit 



