THE FLORA. 



143 



Miocene of the Yellowstone National Park, but 

 it differs slightly in shape and more markedly in 

 nervation< It is rather doubtful if F. haguei 

 was correctly referred to the genus Ficus. 



Occurrence: Laramie formation, Marshall, 

 Boulder County, Colo., collected by Arthur 

 Lakes, 1890. 



Family ANONACEAE. 

 Anona coloradensis Knowlton, n. sp. 



Plate XVIII, figure 4. 



Anona coloradensis Knowlton [nomen nudum], U. S. 

 Geol. Survey Bull. 696, p. 78, 1919. 



Leaves evidently thin and membranaceous, 

 narrowly ovate-lanceolate, very obtusely wedge- 

 shaped at the base, long acuminate at the apex; 

 margin perfectly entire ; midrib strong, straight; 

 secondaries about seven pairs, alternate, thin, 

 at an angle of about 50°, much curved upward 

 just along the borders ; finer nervation obsolete. 



The specimen figured is about 8 centimeters 

 long and 2.75 centimeters wide and is perfect 

 except for small areas at the extreme base and 

 apex. 



This species appears to be closely related to 

 Anona palmeri Safford, 11 a recently described 

 living species from the vicinity of Acapulco, 

 Mexico, being especially like the larger upper- 

 most leaves of that form. They are of the same 

 size and shape and have the same character of 

 nervation, about the only apparent difference 

 being the fewer secondaries in A. coloradensis. 



Three species of Anona from this country 

 have thus far been described— A cretacea 

 Lesquereux, 12 from the Dakota sandstone; 

 A. robusta Lesquereux, 12a from the Laramie at 

 Golden, Colo.; and A. spolidta Cockerell, 13 

 from the Miocene at Florissant, Colo. The 

 Dakota species has never been figured. The 

 original figure of A. robusta, the Laramie 

 species, is reproduced in Plate XVII, figure 7. 

 The Florissant species is smaller and very 

 different in shape, being similar to the living 

 A. glabra LinnS, of Florida. The present 

 species, if referable to this genus, belongs to 

 quite another section than those above men- 

 tioned. 



" Safford, W. E., Contr. U. S. Nat. Herb., vol. 18, pi. 24, 1914. ; 



w Lesquereux, Leo, The Cretaceous and Tertiary floras: U. S. Geol. 

 Survey Terr. Rept., vol. 8, p. 77, 1883. 



m» Idem, p. 124, pi. 20, fig. 4. 



" Cockerell, T. D. A., Descriptions of Tertiary plants, II; Am. Jour. 

 Soi., 4th ser., vol. 26, p. 542, fig. 7, 1908. 



Occurrence: Laramie formation, Cowan sta- 

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

 by F. H. Knowlton. 



Anona robusta Lesquereux. 



Plate XVII, figure 7. 



Anona robusta Lesquereux, Cretaceous and Tertiary 

 floras: U. S. Geol. Survey Terr. Rept.,, vol: 8, 

 p. 124, pi. 20, fig. 4, 1883. 



Leaf large, about 13 centimeters long, 6 

 centimeters broad below the middle, coriaceous, 

 ovate-lanceolate, gradually narrowed to the 

 pointed apex, abruptly rounded and truncate 

 at the base, margin slightly undulate; median 

 nerve very thick, especially below, straight; 

 secondaries 12 or 13 pairs, strong, mainly 

 alternate, close, parallel, very open or nearly 

 at right angles toward the base, then gradually 

 at a more acute angle, slightly curved upward, 

 camptodrome; nervilles prominent, oblique 

 to the secondaries, simple and continuous or 

 anastomosing in the middle. 



The type and so far as known the only 

 specimen of this fine species is in the collection 

 of the Museum of Princeton University (No. 

 La. 74). It is preserved on the coarse white 

 sandstone characteristic of the true Laramie 

 in the vicinity of Golden, Colo. There is 

 nothing to add to the description and well- 

 executed figure given by Lesquereux. 



Occurrence: Laramie formation, Golden, 

 Colo., first sandstone hogback west of Tarr 

 Hall. 



Family LATTRACEAE. 



Laurus lanceolata Knowlton, n. sp. 



Plate XXI, figure 7. 



Laurus lanceolata Knowlton [nomen nudum], TJ. S. 

 Geol. Survey Bull. 696, p. 346, 1919. 



Leaf coriaceous, narrowly lanceolate or 

 possibly oblanceolate, long and narrowly 

 wedge-shaped at the base, somewhat un- 

 equal sided (apex destroyed); midrib rela- 

 tively strong, especially below, perfectly 

 straight; secondaries few (only., four pairs 

 showing in the specimen) , . opposite or sub- 

 opposite, at an- acute angle, passing up for 

 long distances, and but slightly curved, dip- 

 appearing 'just at the margin; nervilles few 

 and obscure, apparently .unbroken and at 

 right angles to the secondaries. 



This species is represented by the single 

 example figured, which unfortunately lacks the 



