'I'rKKS of TllK NoRTFiKRX UNITED StATES •'•'•• 



"J. J'ctals without scales at the base; inflorescence witli 

 large bracts ; leaves comparatively small ; cultivated. 

 /'. ciirofacd. 



1. Tilia americana L. American Linden. A large, 

 straight-trunked tree with spreading branches. Inner bark 

 very tough ; used for mats and coarse rope. Wood soft and 

 very white, light and uniform in texture, not liable to crack; 

 called "basswood :" used for wooden-ware, cabinet-work, 

 trunks, panelling of carriages, in cooperage, and for toys. 

 The bark and wood of the other lindens are much the same. 

 In rich soil, on blufifs, and along river bottoms. N. B. to Ga., 

 Manitoba, Kan., and Tex. 



2. Tilia pubescens Ait. Downy Linden. A small tree 

 growing in moist soil, mostly along the coast. Wood as in 

 7\ americana but lighter in weight. Va. to Fla., west to Tex. 



■'.. Tilia heterophylla Vent. White Linden. A tree 

 with larger leaves than either of the preceding species. Wood 

 weak, light brown. N. Y. to Fla., Ala., 111., and Tenn. 



4. Tilia curopaca L. European Linden. A large tree 

 nnich cultivated in parks. Its name, Lin. was the origin of 

 the family name of Linnaeus. 



Subclass, Calyciflorae. 

 Order, Rosales. 



Rosaceac. Rose Family. 



Malatae. Apple Subfamily. ' 



•_M. Sorbus (Tourn.) L. .M(»untain-a>li. 



Trees or shrubs with alternate, odd-pinnate leaves, ter- 

 minal buds, cylindrical pith, and o-") bundlescars in the nar- 

 row leaf scar. 



I'^lowcrs bisporangiate ; I'ruii a small red beny-like i)ome. 

 in compound cymes. 



1. Leaflets glabrous above. 2. 



1. Leaflets pubescent on both sides; calyx and, pedicels 



usually woolly. .V. aucuparia. 

 1. Leaflets long-accuminate ; fruit less than \ in. in 



diameter. 5. americana. 

 1. Leaflets obtuse or short-pointed; fruit more than ', 



in. in diameter. .V. scof>uUna. 



