FOSSIL FLORA. 737 



also be noted that Newberry's material does not show the leaflets as peti- 

 oled, but in the description of S. affinis he says, "leaflets * * * sessile 

 or short-petioled." Many of the detached leaflets in his material, named in 

 his handwriting, are distinctly short-petioled, in which particular the Park 

 specimens agree. Some have, it is true, very short petioles, yet all seem 

 to have them. 



In only two cases have leaflets been found in this collection attached 

 to the rachis, and these have both been figured. 



Habitat: Yellowstone River, one-half mile below the mouth of Elk 

 Creek; found throughout the section, and most abundant at the bottom; 

 collected by F. H. Knowlton, August, 1888. 



? Sapindus alatus Ward. 

 Sapindus alatus Ward : Types of the Laramie Fl., p. 68, PI. XXXI, figs. 3, 4. 



This specimen is the only one that I venture to refer to this species. 

 It was found in the same beds with the abundant 8. affinis Newby., and 

 possibly may be an abnormal or unusual leaflet of that species. It is, how- 

 ever, more regular, and has the thick or winged petiole of S. alatus. 



Habitat: Yellowstone River, one-half mile below the mouth of Elk 

 Creek, Yellowstone National Park; top of bluff, 300 feet above the river; 

 collected by F. H. Knowlton, August, 1888. 



Sapindus grandifoliolus Ward. 



PL XCIX, figs. 1, 2; PL Oil, fig. 4. 



Sapindus grandifoliolus Ward: Types of the Laramie FL, p. 67, PL XXX, figs. 3-5; 

 PL XXXI, figs. 1-2. 



Several small doubtful leaves are referred to this species. One in 

 particular has some resemblance to leaves of Juglans rugosa Lx., but seems 

 to be closer to the Sapindus grandifoliolus of Ward. 



Habitat: Fossil Forest Ridge, bed No. (3, "Platanus bed;" collected 

 by Ward and Knowlton, August, 1887. Also found on the south side of 

 Stinkingwater Valley, on ;i high bluff east of mouth of Crag Creek, col- 

 lected by F. P. King for Arnold Hague, September 4, 1897. 



3I0N XXXII, PT II 47 



