84 



Ilysaxthes refracta (Ell.) Raf. 341. 

 KiCKXiA Elatixe (L.) Dumort. 



Tursitis Elatine (L.) Raf. 1159. 



T.filifera Raf. 1160. 



LiMOSELLA SUBULATA IveS. 



L. hracMstema Raf. [end of list above]. 

 LiNARiA CANADENSIS (L.) Dum.-Cours. 



Antirrhinum canadense assurgens Raf. 1139. 

 Macuillamia rotundifolia (Michx.) Raf. 332. 



M. ohovata Raf. 333. 

 Mecardonia ACUMINATA (Walt.) Small. 



Ambulia rigida (Raf.) Raf. 325, 

 Melampyrum LiNEARE LATiFOLiUM (Muhl.) Beauverd. 



M. lanceolahim Raf. 1174. 



SCOPARIA DULCIS L. 



Ambidia micrantha (Nutt.) Raf. 330. 



SCROPHULARIA LAXCEOLATA Pursh. 



(?) S. dimidiata Raf. 1186. 

 S. leporella Bickn. 

 6'. pectinata Raf. 11 80. 

 Academy of Natural Sciences, Philadelphia. 



SHORTER NOTES 



NOTES ON A GROWTH OF YOUNG WHITE BIRCH. 

 Herbert C. Wickexheiser. 



There is an interesting stand of very young white birch on the 

 cinder filled swamp area at the south end of Van Cortlandt 

 Park, facing Broadway, New York City. These trees appear 

 to be in the main exceptionally well-formed, typical specimens 

 of the common white birch, Betula populifolia, having even in 

 this young stage the characteristic pyramidal form. The>- all 

 seem vigorous and well rooted and are growing nicely. Their 

 distrilnition over the filled-in swamp area is rather irregular, in 

 some places none and in others covering the ground as uniformly 

 as in a cultivated plot. 



