Fig. 115 

 Poplar. A 

 very covi- 

 ijion tree. 



(BROOKLYN- 

 BOTANIC 



garden) 



PROBLEM 2. The Kinds of Plants of the Earth 



how many acres of wheat there must be. 



In the tropics there grow the large 



banana plant and a giant grass, the sugar 



cane, that makes much~orThy Sllgar eateTT 



uonocotyledons, as the 



by -man . S t 



d^te and coconut palms,^re~trees. Tfiey 



supply mucli^food. n 



Many dicots are trees. You have already 

 read about the cTTrTC'''5earers; the rest 

 of our native trees are dicots except for 

 one or two palm species which grow in 

 the semitropical climate of Florida and 

 southern California. A4ost dicot trees in 

 our country shed their leaves at the end 

 of the season and are for this reason 

 called decidi/07 /s (de-sid'you-us). The 

 deciduous trees are rather generally re- 

 ferred to as "hardwoods" by foresters 

 and lumbermen. 



There are several families of trees 

 widely spread through large portions of 

 the United States; you are probably 

 familiar with most of them. If you can 

 recognize oaks^^ jjiaples . elms, and.hic k- 

 ories or walnuts you are acquainted with 



85 



Fig. 1 16 

 Oak. This 

 and the 

 poplar and 

 ehii have 

 feather net 

 veins. 



(AMERICAN 

 MUSEUM 



of natural 

 history) 



Fig. 114 This shagbark hickory leaf is a coin- 

 pound leaf. (brookly'N botanic garden) 



u.. 



Fig. 117 

 Elm. H01V 

 can yon 

 recognize 



it? (AMERI- 

 CAN MU- 

 SEUM OF 

 NATURAL 



history) 



Fig. 118 

 Red maple. 

 How can 

 yon distin- 

 guish this 

 Tiiaple from 

 the one in 

 Figure 110? 



(AMERICAN 

 MUSEUM OF 

 NATURAL 



history) 



w 



r 



1 



M 



