FOSSIL FLORA. 747 



Creek, top of bluff; collected by F. H Knowlton, August 27, 1888. Ande- 

 sitic breccia, near gulch northwest of peak west of Dunraven; collected by 

 J. P. Iddings, September 12, 1883. Also found on Overlook Mountain, in 

 breccia, at an altitude of 10,070 feet; collected by Arnold Hague, August 

 6, 1897. Southern spur of Chaos Mountain, at an altitude of 10,100 feet; 

 collected by Arnold Hague, August 11, 1897. South side of Stinkingwater 

 Valley, on high bluff east of mouth of Crag Creek; collected by Arnold 

 Hague, September 4, 1897. 



Aralia serrulata n. sp. 

 PI. CI, fig. 3. 



Leaf apparently subcoriaceous, palmately 3-lobed, middle lobe longest, 

 ovate, obtuse; lateral lobes short, pointing upward; borders sharply serru- 

 late, with small, sharp, upward-pointing teeth; secondaries numerous, close, 

 alternate, at an angle of 25° to 40°, curving upward and entering the teeth, 

 or sometimes camptodrome with outside branches to the teeth, usually 1 

 tooth between the 2 entered by two contiguous secondaries, which is sup- 

 plied with a branch from the middle of a percurrent nerville, which crosses 

 just below it; nervilles numerous, mainly percurrent and approximately at 

 right angles to the secondaries; finer nervation quadrangular. 



This fine and apparently characteristic species depends upon the single 

 example figured. It lacks the entire lower portion of the leaf, but 2 lobes 

 are entirely preserved, and a large portion of the other. The central lobe 

 is 4.5 cm. long to the sinus, and the lateral one about 1 cm. higher than the 

 sinus. The distance between the lateral lobes is 8.5 cm. 



This species has exactly the same size and shape as many of the 

 3-lobed specimens of Aralia notata Lx., 1 found in the same beds. 



The main difference is in the sharply serrate margins, the teeth extend- 

 ing even down to and through the sinus, and in the secondaries or branches 

 from them entering the teeth. Occasionally, as indicated under the diag- 

 nosis, some of the secondaries are camptodrome, as all are in A. notata, with 

 outside branches passing to the teeth. These species are evidently closely 

 related and may possibly be the same, although probably not, for in 100 

 specimens of A. notata not one was found that possessed these teeth. 



As pointed out under the discussion of Aralia notata (see ante, p. 745), 



'Cf. Lesquereux, Tert. PI., PI. XXXIX, figs. 2, 3. Ward: Types of Laramie PL, PI. XXVII,fig. 1. 



