172 UNIVERSITY OF MISSOURI STUDIES [314 



610. A. dasycarpum Ehrh. [A. saccharimim L.]. Sil- 



ver MAPLE. 



Very common in low grounds and along streams: the 

 form with deeply cleft leaves, and commonly planted as a 

 shade tree, is the var. laciniatum Sargent. 



New Brunswick to Ontario and North Dakota; Florida 

 to the Indian Territory. 



611. A. Negundo L. \_N. aceroides Moench: R. Negundo 

 (L.) A. S. Hitchc.]. Box-elder. 



Infrequent along streams; common as an ornamental tree. 

 Vermont and Ontario to Manitoba; Florida to New 

 Mexico. 



612. A. saccharinum Wang. {A. saccharum Marsh.]. 

 Sugar maple. Rock maple. 



Oak forests in rich soil; seldom in groves in rich soil. 

 Newfoundland to Manitoba and South Dakota; Georgia 

 to Texas. 



613. A. barbatum Michx. \A. saccharum barbatum 

 (Michx.) Trelease]. 



Common in rocky soil. 



Maine and Michigan to Tennessee and Missouri. 



614. A. nigrum Michx. f. [^A. sacc/iarhmm mg-rum (Michx. 

 f.) T. & G. : A. sacchariim nigrum (Michx. f.) Britton]. 

 Black maple. 



Common in rich rocky woods near streams. 

 Ontario to Minnesota; Georgia to Louisiana. 



Family 65. HIPPOCASTANACEAE T. %l G. Horse chestnut 

 family. 



241. AESOULUS L. Horse chestnut. 



615. A. glabra Wi lid. Ohio buckeye. 



Common on hillsides and the banks of streams; usually a 

 small tree. 



Pennsylvania and Michigan to Iowa and Kansas; Geor- 

 gia to Texas. 



