CRETACEOUS FLORA, 15 



Laurus.l 



paratively thick, straight ; secondaries numerous, alternate; slender, at an acute angle of 

 divergence, parallel, except those of the lower pair, more oblique and prolonged reticulate in 

 the intervals. 



One of the leaves (PI. A, f. 6), is 6 cm. long, nearly 2 cm. broad below the middle, 

 with a petiole 6 mm. long; has the characters of the species as described by Heer, I. c., 

 from specimens of the Middle Cretaceous of Greenland. 



The reticulation of the nervilles is obscure, the lateral veins being thin, and 

 obsolete in the upper part, and thus the leaf appears at first like that of a Salix, but 

 traces of the transverse nervilles are seen in the lower lateral veins, as marked upon 

 the figure, quite as well as they would be observed upon the specimens from Atane, 

 figured by Heer. The other leaf, which I refer to the same species (PI. B f. 5), is longer 

 and more linear, without any trace of nerves. It is remarkably similar to some of 

 the figures of Heer, /. c., especially to f. 2 of PI. XIX, and f. 4 of PI. XX, and as these 

 figures have scarcely any nerves distinctly seen, the absence of secondaries may be 

 merely casual. However, the reference is not conclusive, as none of the figured 

 leaves of Heer have the upper part represented. Another species also of the Creta- 

 ceous of Greenland, Myricalonga Heer, Arct. Fl. VI, Part 2, p. 65, PI. XVIII, f. 9 b ; 

 PI. XXIX, f. 15-17 ; PI. XXIII, f. 10, has the leaves about of the same form and size 

 without any nerves, but these leaves are rather linear than lanceolate, and broadly 

 obtuse at the apex. The relation is therefore less clearly marked than with Laurus 

 plutonia. 



Hub. North side of Big Cottonwood river, near New Ulm, Minnesota. 

 Mits. fiey. No. 5157 C. The other is from Mankato. No. 5666 A. 



LAURUS NEBRASCENSIS Lesqx. 



PLATE A, FIG. 7. 



Cret. FL p. 74, PL X. f. 1, PL XXVIII, f. 14. 



Leaves coriaceous, elliptical-oblong or narrowly lanceolate, obtusely pointed, tapering 

 downward to a short, thick petiole; medial nerve thick, half round; lateral nerves at an 

 acute angle of divergence, camptodrome. 



The leaf is somewhat longer and narrower than the one /. c., PI. X, f. 1, but it is 

 of the same size as that of PI. XXVIII. f. 14. It is easily identified by the very thick 

 medial nerve continuous to a short terete petiole. The species is not rare in the 

 Dakota group, both in Nebraska and Kansas. Another species also frequently found 

 in Kansas, and closely allied is L. proteifolia Lesqx., Cret. and Tert. Fl., PI. Ill, f. 9 



