SPECIES OF PLANTS FROM THE CHALK BLUFFS OF 



CALIFORNIA. 



A few fragments sent from this locality are figured, pi. x\vb, as sup- 

 plement to the records obtained until now on the Flora of the remarkable 

 formation of the Gold-bearing gravel of Nevada and California. The age 

 of this formation, which I have considered as recent Miocene, or old 

 Pliocene, is not positively ascertained. All the species known from that 

 locality have been described in "Mem. of the Museum of Comp. Zool.," 

 Harvard College, vol. vi, No. 2. They are recorded in the table of distribu- 

 tion. The fragments figured, pi. xlvb, represent the following species: 



Quercus convexa, Lesqx. 

 Plate XLV B, Figs. 5, 6. 

 "Mem. of the Museum," loc. cit., p. 4, pi. i, figs. 13, 17. 



The species is most abundantly represented. 



Ulmus californica, Lesqx. 

 Plate XLVb, Figs. 3, 4, 7. 

 Ibid., p. 15, pi. iv, figs. 1, 2 ; vi, fig. 7a. 



The leaves of this species are very variable, often simply dentate and 

 lanceolate-acuminate. 



Aralia acerifolia, Lesqx. 



Plate XLVb, Fig. 1. 



Species described from the Bad Lands, this vol., p. 232, pi. xlix, fig. 5. 



Aralia Zaddachi?, Heer. 



Plate XLVb, figs. 8,9. 

 Ibid, p. 21, pi. v, figs. 2, 3. 



The fragments represent more distinctly the lobes of the species 

 described, I. c, but do not add any more evidence to the relation of the 

 leaves to A. Zaddachi of Heer. 



Cercocarpus antiqnus, Lesqx. 



Plate XLVb, Fig. 2. 

 Ibid, p. 37, pi. i, figs. 6-11. 



The leaf is better preserved than any of those previously seen. Its 

 characters are the same; the leaf is only broader and a little shorter; the 

 short petiole is entirely preserved. 



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