272 



LES SOU'S WITH PLANTS 



all around. In other words, there is no particu- 

 lar form of fruit which is typical of the samara. 



321. Samaras of two of the 



common ashes are shown in 



Figs. 266 and 267. In these 



trees, the fruit is a cylindrical 



shaft provided with a wing, 



and the extent of this wing is 



one of the distinguishing marks 



of the different kinds of ash. 



The ovary is 2-carpelled. Are 



the fruits always or ever 2- 



seeded ? 



322. The fruits of various 

 kinds of elms are shown, natural 

 size, in Figs. 268-272. They re- 

 semble the fruit of the hop -tree, 

 but differ in being 1-loculed and 

 in other more technical characters. 

 The pictures represent all the 

 kinds of elms which the pupil 

 will find in the United States 

 outside of the Rio Grande region 

 (except a few introduced species 

 in gardens). Now let him determine the kinds 

 which he may meet, and match with them the 

 leaves and buds. The elm fruits mature in very 

 early spring. 



Fig. 264. 

 Box-elder. 



