A Recent Discovery of Hybrid Oaks on Staten Island. 

 By Arthur Hollick. 



Plates LXXXIII-LXXXV. 



One day during the past summer Mr. Wm. T. Davis, of 

 Tompkinsville, Staten Island, brougiit to me some leaves of an 

 oak tree which he had found growing in the neighborhood of 

 Tottenville, Staten Island, N. Y. To my surprise and delight I 

 recognized them as belonging to Qiierciis heterophylla, Michx. — 

 the celebrated " Bartram Oak." On September 2d we visited 

 the locality and found not only typical Q. heterophylla, but also 

 a number of other pecuHar forms, evidently hybrids, and including 

 Q. Rudkini, Britton. On September 2 2d the trees were again 

 visited ; a careful study was made of them and their surroundings 

 and a fine series of leaves and fruit collected. Probably no better 

 opportunities for observation or finer specimens for study and 

 comparison have ever been obtained, and the results have proved 

 to be highly interesting. Two recognized species are added to the 

 local flora of Staten Island and to the flora of New York State, and 

 the northern range of Q. heterophylla is extended about thirty miles 

 from its nearest previously-reported station. Considerable new 

 Ught is also shed upon the question of the proper status of this 

 latter form, in the botanical world, whether as a species, a variety 

 or a hybrid, and, if the latter, what species are the probable parents. 



The hmits of this paper forbid an extensive review of the ht- 

 erature concerning these two interesting oaks, but for the benefit 

 of all who may wish to study the subject I would refer to the ac- 

 count of Q. Rudkini, by Dr. N. L. Britton, in Vol. IX. No. 2, of 

 the Bulletin, and for Q. heterophylla to Mr. I. C. Martindale's 

 " Notes on the Bartram Oak," read before the West New Jersey 

 Surveyors' Association, Jan. 6, 1880, and subsequently published 

 in pamphlet form by the author. As, however, everyone may 



