FLORA OF THE FRUITLAND AND KIRTLANE> FORMATIONS. 



341 



Family NYMPH^ACEa;. 



Nelumbo sp. 

 Plate LXXXVI, figure 11. 



The San Juan Basin collections include the 

 specimen here figured, which appears to belong 

 to Nelumbo. It is a fragment from near the 

 central part of what was a perfoUate leaf of 

 considerable size, though none of the margin is 

 now retained. The leaf was at least 12 centi- 

 meters in diameter and veiy likely was nearly 

 t'w'ice this size. It was evidently very thick, 

 as is proved by the fact that the ribs seem 

 deeply embedded in the leaf substance — so 

 deeply, in fact, that it is impossible to deter- 

 mine their exact number, though there were 

 apparently as many as 18 or 20. There is also 

 evidence that some of them were imforked. 

 None of the other details can now be made out. 



It is hardly worth while to attempt com- 

 parisons between this and described species 

 of the genus, as so many of its characters are 

 obscure or missing. It appears, however, to be 

 of the type of the common livmg Nelwnho lutea 

 (Wnidenow) Persoon, the water chinkapin of 

 lakes and streams. 



Occun-ence: Fruitland formation, 30 miles 

 south of Farmmgton and 1 mUe east of reser- 

 vation line, San Juan Coimty, N. Mex. Lot 

 76 (6953). 



Family MIMOSACEa;. 



Leguminosites? neomexicana Knowlton, n. sp. 



Plate XC, figures 3, 4. 



Leaflet minute, about 11 millimeters in 

 length and 5 miUimeters in width, ovate- 

 lanceolate, romided and apparently truncate 

 at base, acuminate at apex; midrib very thick 

 for the size of the blade; secondaries ex- 

 tremely thm, about four pairs, alternate, 

 camptodrome, each joining the one next above 

 and forming a bow far inside the margin ; finer 

 nervation not retained. 



It must be confessed that this leaflet is of 

 Httle stratigraphic value, its maui interest 

 being in the evidence it affords of the presence 

 of vegetation of this tj^jc in these beds. It is 

 so very small and on the whole so poorly pre- 

 served that comparisons with other forms 

 referred to this type wiU not be attempted. 



Occurrence: Kirtland shale, 1^ miles north- 

 east of Pma Veta Chma, San Juan County, 

 N. Mex. Lot 40 (6966). 



FamUy STERCULEACE.ffl. 

 Pterospermites undulatus Knowlton. 



Plate XO, figure 5. 



Pirrospennites undulatus Rnowlton, U. S. Geol. Survey 

 Bull. 163, p. 67, pi. 16, fig. 3; pi. 17, fig. 2; pi. 18, 

 fig. 4, 1900. 



The example figured, which unfortunately is 

 much broken, appears to be referable to this 

 species. It is of about the average size of 

 those from Point of Rocks, Wyo., and with 

 the exception of bemg a little more rounded 

 below does not differ essentially. 



OccmTence: Fruitland formation, 30 miles 

 south of Farmington and 1 mile east of reser- 

 vation Une, San Juan County, N. Mex. Lot 

 75 (6956). 



Pterospermites neomexicanus Knowlton, n. sp. 



Plate XC, figure 6. 



Leaf evidently tliin in texture, ovate, 

 abruptly truncate and slightly heart-shaped 

 at base, acmninate at apex; margin entire 

 below, becomuig slightly undulate in the mid- 

 dle and few-toothed in the upper tliird, the 

 teeth small, sharp, pomting outward, and 

 separated by very shallow sinuses; midiib 

 slender; secondaries about four pairs, sub- 

 opposite, remote, the lower pair arising near 

 the top of the petiole, with five or six branches 

 on the lower or outer side, the lowest with 

 several tertiary camptodi'ome branches on the 

 lower side; upper secondaries simple or occa- 

 sionally branched; nervilles few, irregular; 

 finer nei-vation not retained. 



This leaf is regularly ovate, about 8 centi- 

 meters long and 5.5 centimeters wide at the 

 broadest point, wliich is just below the middle. 

 It is otherwise distinguished by its few sec- 

 ondaries and by the margin entire below and 

 imdulate and finely toothed above. 



Occurrence: Fruitland formation, 30 miles 

 south of Farmington and 1 mile east of reser- 

 vation line, San Juaii County, N. Mex. Lot 

 75 (6956). 



Pterospermites sp. 



Plate LXXXIX, figiu-e 3; Plate XC, figure 1. 



One of the collections contains a fragment of 

 a very large leaf that apparently belongs to 

 the genus Pterospermites. It could hardly 

 have been less than 18 centimeters in length 

 and was at least 14 centimeters in width. It 



