112 THE RARITAN FLORA. 



Smith, Geol. Coastal Plain in Ala., 348, 1894. 

 Newb., Fl. Amboy Clays, 65, pi 15, f. 3, 4, 1896. 

 Berry, Bull. Torrey Club, vol. 33: 172, 1906. 



Description. — Leaves ovate to orbicular in general outline, 8 

 cm. to 10 cni. in length by 5 cm. to 7 cm. in width. Apex some- 

 what abruptly produced into an acuminate tip. Base cuneate to 

 rounded or almost truncate. Margins entire. Petiole com- 

 paratively long and stout. Midrib mediumly stout. Secondaries 

 5 or 6 pairs, subopposite below, alternate aboA'e, slender, branch- 

 ing from the midrib at angles of from 45° to '^o'^ and arching 

 upward, camptodrome. 



Prof. Newberry compared this species with Populus hyper- 

 borea Heer and Populus Berggreni Heer, but seemed doubtful 

 of its real relation to Populus. It is also recorded from Staten 

 and Long Islands, from the Magothy formation of Delaware 

 and from the Tuscaloosa formation of Alabama. In the latter 

 region it is quite common and well illustrates the variability from 

 the narrow to the almost orbicular forms. 



Occurrence. — Woodbridge. 



Collections. — N. Y. Botanical Garden. 



Populus orbicularis (Newb.) Berry. 

 Plate XI, Figs. 5, 6. 



Phyllites orbicularis Newb., Fl. Amboy Clays, 130. pi. 24, f. 7, 8, 



1896. 

 Populus orbicularis Berry, Bull. Torrey Club, vol. 36: 250, 1909. 



Description. — Leaves orbicular in outline, with a very slight 

 emargination at the apex and with a slight decurrence from the 

 rounded base to the apparently short petiole. Length about 5 cm., 

 and breadth usually 2 or 3 millimeters less than 5 cm. 

 Margin entire. Midrib mediumly stout. Secondaries campto- 

 drome, relatively coarser than in the preceding species, about 6 

 pairs, subopposite; they branch from the midrib at a wide angle, 

 are less curved than in the preceding and inclined to be somewhat 

 flexuous. 



