228 



DESCRIPTION. 



K. — E. dakotensis Lesquereux. 



In U.S. Geological Survey Monographs, Vol. xvii, " The Flora of the Dakota Group," 

 p. 137, with Plate xxxvii, figs. 14-19, a posthumous work by Leo Lesquereux, 

 "edited by F. H. Knowlton (1891). 



Following is the original description : — 



Leaves coriaceous, linear, or gradually narrowed from an obtuse apes to the base, decurring into 

 a short, alate petiole; borders recurved, median jaerve strong; secondaries thin, oblique, proximate, 

 parallel, camptodrome. 



The species is represented by numerous fragments of very thick leaves, about 1 cm. broad and at 

 least 8 cm. long; the borders are sometimes strongly recurved as in Fig. 15; sometimes flat as in Fig. 19, 

 and judging from the fragment (Fig. 14) the leaves are obtuse at apes. The median nerve is thick, 

 especially so on the lower surface, as in Fig. 19, where the flattened borders are seen decurring along the 

 median nerve at base and thus bordering the short, margined petiole. The secondaries, which are 3 mm. 

 to 4 mm. distant at the base, traverse the blade at an angle of divergence of 30° to 40°. and, curving 

 close to the borders, form by their crossing simple, incumbent bows, like a marginal nerve, distinctly 

 seen only on the lower side of the leaves of the fragments. 



The species is intimately related to E. Geinitzi Heer, described below, the leaves of which are 

 generally much larger. Heer considers his species as the equivalent of Myrtophyllum (Eucalyptus) Geinitzi 

 of the Kreidefl., v. Moletein, p. 22, PI. xi, Figs. 3, 4, represented by two leaves not any larger, 2-5 cm. long, 

 and tapering to an acumen, with the base not decurrent, but narrowed to a short, naked petiole. These 

 material differences prevent the identification of the Kansas leaves with those of Moletein and Greenland, 

 though the relation is very close. 



E. dakotensis is also comparable to E. angusta Velenovsky (Flora der bohmischen Kreideformation, 

 pt. 4, p. 3, PL iii, figs. 2-12) but differs by the base of the leaves decurring and apparently obtuse. 



Habitat. — Ellsworth County, Kansas. Nos. 53, 108, 674, 685, 710 of the Museum of the University 

 of Kansas ; A. Wellington and E. P. West, collectors. 



