THE FLORA. 



139 



Bluff, west of Pikeview, Colo., in sec. 14, T. 

 13 S., R. 67 W. It is of about the same size 

 as the largest of the types of this species 

 figured by Lesquereux,' but it is more obtuse 

 at the apex and apparently has fewer second- 

 aries and these at a slightly more acute angle. 

 The basal portion can not be compared with 

 the types. Possibly this leaf should not be 

 referred to Ficus denveriana, though it un- 

 doubtedly approaches that species most closely. 

 Occurrence : Laramie formation. Popes Bluff, 

 west of Pikeview, Colo. (sec. 14, T. 13 S., R. 

 67 W.), collected by A. C. Peale and M. I. 

 Goldman, 1908. Denver formation (types). 

 Golden, Colo. Raton formation, Raton Mesa 

 region of Colorado and New Mexico. 



Ficus crossii Ward. 



Plate XI, figure 2. 



Ficus crossii Ward, U. S. Geol. Survey Sixth .\nn. Kept., 

 p. 552, pi. 44, fig. 7, 1886; U. S. Geol. Survey Bull. 

 37, p. 39, pi. 21, fig. 2, 1887. 



Ficus uncata Lesquereux. Knowlton, U. S. Geol. Survey 

 Bull. 152, p. 105, 1898. 



The type specimen of this species (U. S. 

 Nat. Mus. No. 4106) is before me. Although 

 it is described by Ward as being "preserved 

 with considerable fidelity," a careful study dis- 

 closes the fact that Ward's figure of it is some- 

 what in error. None of the basal portion and 

 indeed very little of the margin is preserved. 

 The blade alone was probably over 8 centi- 

 meters in length, and it may have been longer. 

 The midrib has the appearance of being un- 

 usually thick for a leaf of this size, and it was 

 largely on this account that I was at one time 

 inclined to refer this leaf to Ficus uncata, 

 which has an especially strong midrib. 



The later collections from Golden included 

 the specimen here figured, which is believed 

 to be the same as Ficus crossii. It is a longer 

 leaf than Ward's figui'e of F. crossii would im- 

 ply, but they were probably really of the same 

 dimensions. The present leaf, which is also 

 ovate-oblong in outline, was about 9 centi- 

 meters long and nearly 6 centimeters wide. 

 The midrib is very thick below but becomes 

 thinner above. There are 10 or 11 pab's of 

 secondaries, which arise at an angle of about 

 70° and are abruptly camptodrome near the 

 margin. The lower secondary has a few very 



' The Tertiary flora: U. S. Geol. Survey Terr. Kept., vol. 7, pi. 33, 

 fig. 5, 1878. 



short camptodrome branches on the outside. 

 The nervilles are seen to be numerous, strong, 

 and oblique to the secondaries, as in F. crossi. 

 They seem best removed from Ficus uncata. 



These leaves suggest Rhamnus goldianus 

 Lesquereux,^ but they are more wedge-shaped 

 at the base and, moreover, the secondaries 

 curve near the margins in a very different 

 manner. 



Occurrence: Laramie formation (type), 

 Golden, Colo., collected by Whitman Cross, 

 for whom it is named. The specimen fig- 

 ured was collected by L. F. Ward 1} miles 

 southwest of Golden, _Colo. 



Ficus cowanensis Knowlton, n. sp. 



Plate VIII, figure 6; Plate IX, figures 2, 3. 



Ficus cowanensis Knowlton [nomen nudum], U. S. Geol. 

 Survey Bull. 696, p. 273, 1919. 



Leaves of large size and thick texture; 

 ovate-lanceolate, or perhaps narrowly obovate- 

 lanceolate, with long, wedge-shaped base and 

 rather obtuse apex; margin perfectly entire; 

 midrib extremely thick, especially below; 

 secondaries few — about six or seven pairs — far 

 apart, relatively very thin, at an angle of 

 approximately 30° or 40°, apparently campto- 

 drome; nervilles numerous, very thin, at 

 nearly right angles to the secondaries. 



This species is represented by several exam- 

 ples, all of which are fragmentary or more or 

 less distorted. The length, so far as can be 

 made out, is about 15 centimeters and the 

 width 7 or S centimeters. The secondaries 

 are exceptionally slender for a leaf of this 

 size. 



Occurrence: Laramie formation, Cowan sta- 

 tion, 10 miles south of Denver, Colo., collected 

 by F. H. Knowlton. 



Ficus berryana Knowlton, n. sp. 



Plate XI, figure 1. 



Ficus berryana Knowlton [nomen nudum], IT. S. Geol. 

 Survey Bull. 696, p. 272, 1919. 



Leaf tliin in texture, broadly ovate, very 

 abruptly rounded and truncate at the base, 

 deltoid-acuminate at the apex; margin entire; 

 nervation veiy light, triple-nerved from the 

 base of the blade; midrib straight, with about 

 two pairs of alternate, apparently campto- 



' LesquerevLX, Leo, The Tertiary flora: U. S. Geol. Survey Terr. Kept., 

 vol. 7, pi. 53, figs. 4-8, 1878. 



