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SOME REMARKABLE STRINGS OF BUTTON-BALLS 



The sycamore Platanus occidenfalis or, as it should be called, plane-tree in America usually 

 bears single flower heads popularly called button-balls. Investigation by members ot the 

 American Genetic Association has brought to hght strings of them containing as many as 

 fevenMessor Augustine Henry, the distinguished British authority on rees, su^gst 

 that these trees may be hybrids between Platanus occtdentahs and P. aceiitolia. Fnoto 

 graph (considerably reduced) by R. W. Shufeldt. (Fig. 6.) 



