I20 THE RARITAN FLORA. 



because oi the incompleteness of the New Jersey material, con- 

 sequently the present form is here renamed in allusion to the 

 horizon from which it was collected. 



Occurrence.— SdiyTeviWe. 



Collections. — N. Y. Botanical Garden, 



Order URTiCALES. 



Family ULMACE^. 



Genus PLANERA Gmelin. 

 (Syst, vol. II, pt. i, 1891, p. ISO.) 

 Planera Knowltoniana Hollick. 



Planera Knozdtoniana Hollick in Newb., Fl. Amboy Clays, 69, 

 pi. 42, f. 1-4, 1896. 



Description. — Leaves ovate in outline, broadest toward the 

 base, 2.5 cm. to 5 cm. in length, by i cm. to 2 cm. in breadth, with 

 an obtusely pointed apex and a rounded, pointed base. Margin 

 entire below for a short distance, elsewhere coarsely serrate. 

 Midrib thin, somewhat flexuous. Secondaries numerous, 6 to 8 

 pairs, parallel, fine, not much curved; they branch from the 

 midrib at an acute angle, being either opposite or alternate, and 

 tenninate in the marginal teeth. Lateral branches from toward 

 the tips of some of the secondaries terminate in the intervening 

 teeth. 



This species is frequent at the Woodbridge locality, but is 

 rather poorly preserved, as is so often the case with the more 

 delicate leaves of the smaller Ulmacese. It is ver}^ typical of 

 the leaves of this family in general outline, marginal and vena- 

 tion characters, and could be compared with a number of later 

 species of Planera. It is quite distinct, however, from the species 

 of Planera recently described by the writer from the Bladen 

 formation of North Carolina.^ 



^ Berry, Bull. Torrey Club, vol. 34, 1907, p. 193, pi. 11, f. 7, 8. 



