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TlLIACEAE. 



TILIA. Linden. Lime. Basswood. 

 (Family Tiliaceae). 



Trees: deciduous. Twigs mode- 

 rate, zig-zag, with elongated in- 

 ternodes, terete, the cortex with 

 fibrous wedges in section: pith 

 round or squarish, moderate, con- 

 tinuous, pale, sometimes pink or 

 yellowish. Buds solitary or preco- 

 ciously branched in inflorescence, 

 obliquely sessile, rather large, in- 

 equilaterally ovoid, with 2 mostly 

 green or red glistening-punctate 

 scales, the end-bud lacking. Leaf- 

 scars alternate, 2-ranked on 

 shoots, somewhat elevated, half- 

 elliptical: bundle-traces 3 or most- 

 ly compound and then sometimes 

 scattered : stipule-scars unequal, 

 one of each pair much elongated. 



The winter-characters of lindens 

 are not very marked. References 

 to them are given under Grewia. 



1. Twigs somewhat loosely hairy. T. platyphyllos. 

 Twigs tomentulose. 2. 



Twigs glabrous. 3. 



2. Weeping. T. petiolaris. 

 Not weeping. T. tomentosa. 



3. Twigs slender (2-3 mm.). T. cordata. 

 Twigs moderate (3 mm.). T. heterophylla. 

 Twigs relatively stout (often 4 mm.). (1). T. americana. 



