MARYLAND GEOLOGICAL SURVEY 815 



Salix lesguereuxii Berry, 1911, Bull. 3, Geol. Survey of New Jersey, p. 114. 

 Salix lesquereuxii Berry, 1914, Prof. Paper U. S. Geol. Survey, No. 84, pp. 

 33, 109, pi. vii, figs. 11-13. 



Description. Leaves ovate-lanceolate in outline, somewhat more acu- 

 minate above than below, variable in size, ranging from 6 cm. to 12 cm. 

 in length, and from 1.1 cm. to 2.2 cm. in greatest width, which is usually 

 slightly below the middle. Petiole stout, much larger than in Salix 

 flexuosa, ranging up to 1.2 cm. in length. Midrib stout below, tapering 

 above. Secondaries numerous, sometimes as many as twenty pairs; they 

 branch from the midrib at angles of about 45 and are parallel and camp- 

 todrome. 



This is an exceedingly variable species, as might be expected in a Salix, 

 and Lesquereux established several varieties of which at least one, i. e., 

 linearifolia, is referable to Salix flexuosa Newberry. Some of Lesque- 

 reux's forms are distinguishable with difficulty from the latter, and this 

 is especially shown in the leaves which he figures on plate i of his Cre- 

 taceous and Tertiary Flora. They are, however, larger and somewhat 

 more robust, of a thicker texture, and broadest near the base, from which 

 they taper upward to an exceedingly acuminate tip. In general, Salix 

 lesquereuxii is a relatively much broader, more ovate form with more 

 numerous and better seen secondaries and a longer petiole. 



This species is an exceedingly abundant Cretaceous type in both the 

 East and the West, ranging in the Coastal Plain from the base of the 

 Raritan formation to the top of the Tuscaloosa formation, and possibly 

 through the Eutaw formation as well. It is abundant in the Magothy, 

 Black Creek, and Middendorf beds. In the West it is common in the 

 Dakota sandstone. It is one of the forms recorded by Kurtz from the 

 Upper Cretaceous of Argentina, indicating, if the identification is correct, 

 a very considerable migration during the early Upper Cretaceous. In 

 Alabama it ranges from the bottom to the top of the Tuscaloosa formation. 



Occurrence. RARITAN FORMATION. East Washington Heights, Dis- 

 trict of Columbia. MAGOTHY FORMATION. Deep Cut, Delaware ; Grove 

 Point, Cecil County, Maryland. 



Collection. Maryland Geological Survey. 



