298 GEOLOGICAL SUEVEY OF THE TEERITOKIES. 



ions. It is therefore uncertain if the specific separation of these frag- 

 ments is authorizable. 

 Habitat. — Point of Rocks, William Gleburn. 



5. Sequoia brevifolia, Heer. 



Branches flexuous; branchlets opposite or alternate, open and diverg- 

 ing near the base, then curving upward and erect from the middle to 

 the top. Leaves of two kinds, either small, short, scaliform at the base 

 of the branchlets and covering the whole of them when young, or oblong, 

 enlarged in the middle, obtuse or abruptly narrowed to a point, and 

 gradually and slightly so toward the declining base, distichous, oblique, 

 decreasing in length toward the base and the top of the branchlets. 

 We have a large branch* and numerous more fragmentary specimens of 

 this fine species described by Heer in Flor. Arct. (p. 93, PI. II, fig. 23), 

 from Greenland specimens, in Flor, Spitz, (p. 37, PI. IV, figs. 2-3), from 

 Spitzbergen specimens, and formerly in Fl. Baltica (p. 21, PI. HI, fig. 10). 

 It is well characterized by the form of its generally short open dis- 

 tichous leaves, either abruptly pointed, or obtuse, deeply nerved, and 

 slightly decreasing in width from above the middle to the base. We 

 have, however, a number of specimens with somewhat narrower, nearly 

 linear, longer leaves, which show a notable deviation of the normal form. 

 The cone of this species is not known as yet. One of the specimens bear- 

 ing scattered branchlets and leaves of this Sequoia has a cone, which 

 appears to be a flattened cross-section, or perhaps the flattened base of 

 the cone turned upward, the pedicel marking the central point around 

 which the scales, oblong, cuneate, narrow, emarginate at the top, are im- 

 bricated to the borders. These scales rather resemble those of a Glyp- 

 tostrobus than those of a Sequoia. 



Habitat. — Point of Rocks, Dr. F. V. Hayden, Wm. Gleburn, whose 

 collection has about one-half of the specimens representing this 

 species in its normal form, and its variety. 



6. Sequoia longifolia, Lsqx., MSS. 



Branches thick ; leaves closely appressed, erect, long linear lanceolate- 

 pointed or accuminate, enlarged above the slightly contracted and decur- 

 ring base ; scars deep, lingulate-pointed, marked by a deep groove in the 

 middle. 



This species was already described from Black Butte specimens ; these 

 have, some of them at least, longer leaves than those of Black Butte. In. 

 these, the leaves average two and a half to three centimeters long and 

 three millimeters wide ; in those of Point of Rocks, the leaves, of the same 

 width, are generally five centimeters long, even more. In both forms, 

 they are marked by a broad indistinct middle nerve, and the surface, 

 seen with the glass, appears very thinly striated in the length. This char- 

 acter, as well as the thick consistence of the leaves, seems to prove the 

 identity of the species, though the leaves of the specimens of Point of 

 Rocks are not only longer but proportionally narrower and scarcely 

 contracted to the point of attachment to the branches. In both, these 

 leaves are generally crowded and covering the stem. 



Habitat. — Point of Rocks, Dr. F. V. Eayden. 



7. Sequoia tifobmis, sp. nov. 



Stems thick, pinnately branching ; branchlets short, obliquely di- 

 verging; leaves either linear or somewhat broader in the middle, grad- 



* A beautiful specimen, the property of Mr. E. H. Clarke, agent of the Union Pacific 

 Railroad, who kindly lent it for illustration of the species. 



