494 MESOZOIC FLOKAS OF UNITED STATES. 



There is in the Mount Vernon collections a dicotyledonous leaf which 

 Professor Ward on the lal^el identifies with Celastrophyllum Brittonianum, 

 a plant of the flora of the Amboy clays not known to me. 



Celastrophyllum Hunteri Ward. '-'• 

 PL CVIII, Fig. 6. 



1S9.5. C elastrofTiyUum Hunteri Ward: The Potomac Formation (Fifteenth Ann. 

 Rep. U. S. Geol. Sm-v., 1893-94), p. 358, pi. iv, fig. 9. 



Celastrophyllum ? saliciforme Ward n. sp.* 



PI. CVIII, Fig. 7. 



A single specimen of what is apparently a leaf of a dicotyledon 

 different from all the rest was collected November 6, 1892, at the Mount 

 Vernon locality. It is the imprint of the entire form, with, however, 

 the margins not preserved in all places. It is linear ol^long in form, 

 with a great length in proportion to its width. The general shape is 

 that of a willow. It resembles also Roger sia angustifolia, but the margins 

 of the middle and terminal portions have small acute teeth. The mid- 

 nerve is distinct and maintained to near the end of the leaf. The lateral 

 nerves can hardlj^ be made out and must have been slender. They 

 seem to leave the midrib at an angle of about 45° and, about the middle 

 of the lamina, to l^end sharply toward the tip of the leaf. The precise 

 position of this form is doubtful, and it is placed with hesitation in the 

 genus Celastrophyllum. 



"On May 14, 1893, our party collected two lanceolate dicotyledonous leaves in the Mount Vernon 

 chocolate clays at the White House Bluff locality. One of these I used as the type of the new species 

 Celastrophyllum Hunteri. The other I then regarded as different and did not name. I compared it with 

 C. Brittonianum, but it does not very closely resemble that species, being much larger, more elongate, and 

 difl'erent in nervation. In fact, the nervation is nearly the same as that of the tj'pe of C. Hunteri, but the 

 shape is somewhat different. Further study of both specimens convinces me that they belong to the same 

 species. The second leaf is here figured for the first time. It has the following character: 



Leaves lanceolate, widest below the middle, narrowing more rapidly near the apex, acute at the tip, 

 15 mm. to 20 mm. wide, probablj' 7 cm. long, but basal portion wanting in both the specimens known, finely 

 and sharply dentate with shallow teeth; nervation pinnate, craspedodrome, the secondaries nearly straight, 

 leaving the midrib at a very sharp angle, slender, alternate, usually once forking, often below the middle but 

 sometimes near the margin, the branches entering the teeth; midrib relatively strong, central, straight, or 

 somewhat curved. — L. F. W. 



''The specific name given by Professor Fontaine was preoccupied. The one substituted here relates to 

 the elongate willow-like form of the leaf. — L. F. W. 



