26 TREES OP THE NORTHERN UNITED STATES 



ARRANGEMENT OP FLOWERS. Flowers, either solitary 

 or clustered, grow in one of two waysj either at the end 

 of the branches, being then called terminal, or in the axils 

 of the leaves, then called axillary. The stem of a solitary 

 flower or the main stem of a cluster is called a peduncle ; 

 the stems of the separate blossoms of a cluster are called 

 pedicels. When either the flowers or the clusters are 

 without stems, they are said to be sessile. 



Clusters with Pedicellate Flowers. 



Raceme, **^go& flowers on pedicels of about equal 

 length, scattered along the entire stem. Locust-tree. 



Corymb, _xj~|j| like a raceme except that the lower 

 flowers have^^^ longer stems, making the cluster some- 

 what flat-topped ; the outer flowers bloom first. Hawthorn. 



Cyme, "^H^ in appearance much like a corymb, but it 

 differs in /the fact that the central flower blooms first. 

 Alternate-leaved Cornel. 



Umbel, ^ <g^h stems of the separate flowers about equal 

 in length, ^^ and starting from the same point. Gar- 

 den-cherry. 



Panicle, -^J*yf a compound raceme. Catalpa. 



Thyrsus, flpr^ 6 ^ 5 - a compact panicle. Horse-chestnut. 



Clusters with Sessile or Nearly Sessile Flowers. 



Catkin, j<* bracted flowers situated along a slender 

 and usual-$$/ 1 ly drooping stem. This variety of clus- 

 ter is very ^ I common on trees. The Willows, Birches, 

 Chestnuts, Oaks, Pines, and many others have their flow- 

 ers in catkins. 



Head, A the flowers in a close, usually rounded 

 cluster. / Flowering Dogwood. 



FRUIT. In this book a single fruit will include all the 

 parts that grow together and contain seeds, whether from 



