TRIASSIC PLANTS FROM SONORA, MEXICO, IN- 

 CLUDING A NEOCALAMITES NOT PREVIOUSLY 

 REPORTED FROM NORTH AMERICA 



Edwin W. Humphreys 



The New York Botanical Garden 

 (with plate 5) 



The collection on which this article is based is a very small one 

 in regard to the number of both specimens and species. Inas- 

 much, however, as our knowledge of the Triassic flora of North 

 America is comparatively limited, and as the collection contains 

 at least one well-defined species which apparently has not been 

 heretofore reported from North America and others whose range 

 it extends, it is of some interest. It was made a number of years 

 ago by Mr. Benjamin F. Hill in the Santa Clara Coal Field, Sonora, 

 Mexico, and was presented to The New York Botanical Garden 

 by Professor James F. Kemp. 



Although many of the specimens are very fragmentary and the 

 identification of these is more or less unsatisfactory and incom- 

 plete, they are on the whole well preserved in a hard bluish-gray 

 shale and there seems to be every indication that more extensive 

 collecting in this region would add much to our knowledge of the 

 flora that flourished in North America during Triassic time. 



At least two other collections of Triassic plants from this same 

 general region have been described: the one by Newberry,^ from 

 Abiquiu, New Mexico, and Los Bronces and the Yaki River in 

 Sonora, Mexico; the other by Fontaine and Knowlton^ from 

 Abiquiu, New Mexico. As indicated later, some of the plants of 

 the collection under discussion are apparently the same as those 



1 Report of the exploring expedition from Santa Fe, New Mexico, to the junction 

 of the Grand and Green rivers of the Great Colorado of the West, in 1859, under the 

 command of Capt. J. N. Macomb: with a geological report by Prof. J. S. Newberry, 

 geologist of the expedition. Washington, 1876. (Fossil Plants, pp. 141-148. pi. 4-8.) 



2 Proc. U. S. Nat. Mus. 13: 281-285. pl- 22-26. 1890. 



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