81 



these are all simple, entering the points of obtuse teeth, which mark the bor- 

 ders of the lobes from their base to the point. 



This form differs from all the other species by its large size, its broad, 

 obtusely-dentate borders, and the direction of the secondary veins, all craspe- 

 dodrome. Its fades is like that of a Platanus, or of a group referable, perhaps, 

 to Araliaccce, like P. nobilis, Nevvby., P. jatropafolia, P. hercules, Ung., &c, 

 which have representatives in the Miocene of Europe and of America. 1 



Habitat. — South of Fort Harker, Kansas. 



Sassafras harkerianum, Lesqx., PI. xi, Figs. 3-4 ; PI. xxvii, Fig. 2. 



Leaves coriaceous, very thick, broadly round, quadrangular in outline, abruptly narrowed or broadly 

 cuneato to the petiole, aud scarcely decurriug at the base; obscurely three-lobed, undulate dentate 

 between the acute or obtuse lobes. 



Sassafras harkerianum, Lesqx., Hayden's Report, 1872, p. 425. 



This form is like a transient one, and may be considered as in close 

 affinity with S. cretace urn var. obtusum and S. obtusum. From this, however, it 

 differs evidently by the thick smooth coriaceous substance of its leaves ; from 

 the former by its scarcely-marked lobes. It is short-petioled, with short obtuse 

 lobes separated by large undulate sinuses, as in Fig. 4, or with scarcely any 

 definite lobes ; the lateral primary nerves and the lower secondary vein's, too, 

 pass up to short teeth, while the upper secondary veins curve near the 

 borders, which then are entire or merely undulate, as it is easily aeen at the 

 upper border of the right side of the leaf, (Fig. 3.) The nervation of this last 

 leaf is coarser than that of Fig. 4 ; the secondary veins, also, are at a greater 

 distance; but the substance of the leaves and their general outline are the same ; 

 both, too, have been found at the same locality. Fig. 2 of PI. xxvii is 

 copied from a specimen sent to me lately (1873) by Dr. Mudge, and found 

 south of Fort Harker, or near Fort Larned. The leaf, though much smaller, 

 has the characters of this species. The disjunction of the primary nerves is 

 well marked. 



Habitat. — South of Fort Harker, Smoky Hill Forks. 



Sassafras obtusum, Lesqx., PI. xiii, Figs. 2-4. 



Leaves thin, flabelliform, long-petioled, three-obtusely lobed, entire or undulate aloug the lobes, 

 broadly cuneato or narrowed, and scarcely declining to the petiole ; primary nerves forking at a short 

 distance above the border-base of the leaves. 



Sassafras obtusum, Lesqx., Hayden's Report, 1872, p. 424. 



1 Platanus nobilis seems to have the peculiar character, remarked iu Sassafras leaves, with craspe- 

 dodroine secondary veins and dentate borders, or with camptodrome veins aud borders entire. 



11 L 



