GERANIALES. 169 



Order GERANIALES. 



Family RUTACE^. 



Genus CITROPHYLLUM Berry. 



(Bull. Torrey Club, vol. 36, 1909 p. 258.) 



CiTROPHYLLUM ALiGERA (Lesq.) Berry. 



Plate XXI, Figs. 1-8. 



Ficus aligera Lesq., Fl. Dakota Group, 84, pi. 10, f. j-6, 1892. 

 Berry, Kept. State Geologist (N. J.) for 1905, 139: 1906. 

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

 Citrophyllum aligera Berry, Bull. Torrey Club, vol. 36 : 258, pi. 

 1 8a, figs. 1-8, 1909. 



Description. — Leaves, small, elliptical to ovate or ovate-lanceo- 

 late in outline, coriaceous in texture, varying from 2.5 cm. to 6 

 cm. in length by 1.8 cm. to 3.2 cm. in breadth. Margins entire, 

 occasionally slightly undulate. Apex rounded or obtusely 

 acuminate. Base rounded, sub-truncate or cuneate. Petiole 

 stout, from .7 cm. to 2 cm. in length, conspicuously alate. The 

 petiolar wings may be oblong-lanceolate in outline or obovate, 

 together they are from 2.5 mm. to 5 mm. in width, averaging 

 about 3.5 mm. Midrib stout. Secondaries fine, more or less 

 obscured by the coriaceous leaf substance, about 9 alternate pairs, 

 branching from the midrib at angles of from 45° to 50°, parallel, 

 camptodrome. 



These curious leaves were described by Lesquereux from the 

 Dakota Group as a species of Ficus and compared with Ficus 

 huntelioidcs Ettings., and Ficus iiindgei Lesq., neither of which 

 has alate petioles, while the first has an emiarginate apex. Subse- 

 quently the same leaves were found in the Magothy formation 

 of New Jersey, and only recently a single small leaf was found 

 in the upper Raritan beds at South Amboy. They exhibit con- 

 siderable variability in outline, but all have exactly the same 

 aspect and conspicuous alate petiole. They appear to be related 

 to the leaves of the modern genus Citrus. The latter have ex- 



