NO. 2151. FOSSTL PLANTS FROM FLORISSANT— KNOWLTON. 253 



narrowly obovate, wedge-shaped from above the middle, obtuse at 

 apex; lateral leaflets opposite, nearly or quite sessile; upper pair 

 much the larger, elliptical-lanceolate in shape, very unequal-sided, 

 rather abruptly narrowed at base, pointed at apex (14 cm. long, 5 

 cm. broad) ; next pair similar but smaller (9 cm. long, about 4 cm. 

 broad); lower pair smallest, about 6 cm. long and only 2.5 cm. 

 broad, very unequal-sided; all leaflets coarsely, somewhat doubly 

 serrate, the teeth large, rather obtuse; nervation consisting of a very 

 strong midrib and numerous thin, close, slightly arched craspedodrome 

 secondaries; finer nervation obscure. 



Type.— Cat. No. 33,765, U.S.N.M. 



This splendid specimen was contained in the Hambach collection, 

 and as may be seen in the figure, is nearly perfect, the three terminal 

 leaflets being absolutely so, and several of the lower ones nearly 

 complete. In the Florissant material belonging to the United States 

 National Museum there is a specimen [No. 50,288] that was donated 

 by Mr. R. D. Lacoe, which belongs to this species. It shows por- 

 tions of the terminal parts of two leaves, each with several leaflets, 

 but they are obscure and fail to give the clear exposition of characters 

 to be noted in the type-specimen. This Lacoe specimen had passed 

 through Lesquereux's hands and was noted as a new species of Juglans, 

 but it was never published. 



The specimen that was identified by Kirchner ^ as Juglans crossii 

 Knowlton, is now in the United States National Museum [No.33,682], 

 and is before me. The shape of the best preserved leaflet in this 

 specimen is very much like some of the leaflets in Lesquereux's 

 figure,^ but it appears that the latter must have been palmately com- 

 pound, that is the leaflets originated from the top of a common petiole, 

 whereas the present specimen is distinctly pinnately compound. 

 There is no doubt that this Kirchner specimen belongs to Juglans 

 magnijlca. 



The Scudder collection contains three or four leaflets that obviously 

 belong to this species, but it would have been difficult to place them 

 without the specimens showing the leaflets attached. 



Juglans magnijlca appears to be a rather rare species, since only 

 four specimens are contained in the Museum collections, which num- 

 ber many hundreds. It must have been a tree of imposing appear- 

 ance when living, and doubtless supphed the fruits described under 

 separate name, but they can not yet be placed together. It is clearly 

 not the same as Kirchner's J. affinis, which is described from a single, 

 narrowly lanceolate, sparingly toothed leaflet. 



1 Trans. St. Louis Acad. Scl., vol. 8, 1898, p. 183, pi. 14, fig. 7. 

 » Called J. denticulata Heer, Tert. Fl., pi. 58, fig. 1. 



