THE FLORA. 



161 



Order EBENALES. 



Family EBENACEAE. 



Diospyros berryana Knowlton, n. sp. 



Plate XVII, figure 5. 



Diospyros berryana Knowlton [nomen nudum], U. S. Geol. 

 Survey Bull. 696, p. 237, 1919. 



Leaf apparently of medium thickness, 

 broadly lanceolate, broadest near or just be- 

 low the middle, whence it tapers gradually to 

 the wedge-shaped base and presumably to an 

 acuminate apex, but this portion of the leaf 

 is destroyed; margin entire; petiole apparently 

 rather slender; midrib slender; secondaries 

 about 10 pairs, mainly alternate, thin, arising 

 at angles of 30° to 45° with the midrib arching 

 and joining well below the margin and with a 

 series of large loops outside; nervilles numer- 

 ous, relatively strong, very irregular and 

 broken, the finer nervation forming irregular 

 quadrangular areas. 



The leaf figured was certainly not less than 



10 centimeters and may have been as much as 



11 centimeters long. It is a little less than 5 

 centimeters wide. The petiole, which appears 

 to be rather slender, was at least 1 centimeter 

 long. 



In size and shape of leaf, as well as in the 

 essentials of nervation, this form is apparently 

 congeneric with the common persimmon (Dios- 

 pyros virginiana) but differs in specific details. 

 It is also congeneric with a species described 

 as Diospyros copeana Lesquereux, 59 from Elko, 

 Nev., but differs in its larger size, more pointed 

 apex, and fewer secondaries. 



Occurrence : Laramie formation, 2 miles east 

 of Lafayette, Colo., collected by F. H. Knowl- 

 ton, 1908. 



Order GENTIANAXES. 



Family OLEACEAE? 



Fraxinus? princetoniana Knowlton, n. sp. 



Plate XXII, figure 7. 



Leaf long, lanceolate, acuminate at the apex 

 (base destroyed) ; margin entire or slightly un- 

 dulate in the middle portion, sparsely toothed 

 above; midrib slender, straight; secondaries 10 

 or 11 pairs, opposite or occasionally suboppo- 

 site, emerging at an angle of 40° or 45°, curving 

 slightly upward in passing to the border, along 



» Lesquereux, Leo, The Tertiary flora: TJ. S. Geol. Survey Terr. Kept., 

 vol. 7, p. 232, pi. 40, fig. 11, 1878. 



which they appear to curve; nervilles percur- 

 rent, close, parallel, mainly at right angles to 

 the secondaries; finer nervation obsolete. 



This form is represented by the single exam- 

 ple figured, which unfortunately is very frag- 

 mentary, lacking the base and both margins for 

 half the distance above the base. The apex is 

 also split and more or less distorted, and alto- 

 gether its status is unsatisfactory. I have 

 looked carefully for some known species to 

 which this can be referred, but as none has been 

 found it is necessarily regarded as new. It by 

 no means certainly belongs to the genus Fraxi- 

 nus, but as it appears to resemble certain forms 

 placed in this genus, it has been provisionally so 

 referred. 



This specimen was furnished by Prof. William 

 Libbey, jr„ of Princeton University. 



Occurrence: Laramie formation (?), Sand- 

 stone Ridge, east of South Table Mountain, 

 Golden, Colo., 



Family APOCYNACEAE. 

 Apocynophyllum? taenifolium Knowlton, n. sp. 



Plate XVI, figure 2. 



Apocynophyllum? taenifolium Knowlton [nomen nudum], 

 U. S. Geol. Survey Bull. 696, p. 81, 1919. 



Leaf of firm texture, linear-lanceolate, being 

 about 13 centimeters in length and 2 centime- 

 ters in width; it is abruptly rounded to the ob- 

 tuse base (apex destroyed) ; petiole very thick, 

 apparently short; margin' entire; midrib very 

 thick below but thin above, straight; seconda- 

 ries few, eight or nine pairs, alternate, thin, 

 regular, emerging at an angle of about 45°, con- 

 siderably curved upward, camptodrome; finer 

 nervation not retained. 



This form, represented only by the fragment 

 shown in the figure, is too imperfect to be re- 

 garded as adequately characterized, and conse- 

 quently the generic reference has been ques- 

 tioned. It was a long, narrow leaf that was 

 rather abruptly rounded at the base and pre- 

 sumably acuminate at the apex. It is not 

 closely similar to any other form found in these 

 beds. 



Among the several species of ApocynophyUuin 

 described from this country may be mentioned 

 Apocynophyllum sordidum Lesquereux, 60 from 

 the Dakota sandstone of Kansas. That species, 



™ Lesquereux, Leo, Flora of the Dakota group: IT. S. Geol. Survey 

 Mon. 17, p. 109, pi. 64, fig. 11, 1892. 



