88 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



fig. 9 may belong to a species of the same kind as the former. The charac- 

 ters, liovvever, are somewhat different. The small stem, which, flattened, 

 measures scarcely one and a half centimeters in width, is indistinctly articu- 

 late, and bears, just above the articulation, a round scar, about like that of 

 the largQ stem in fig. 6, described above; but the nervation of the epidermis 

 is double and distinct, the primary veins, two millimeters distant and com- 

 paratively thick, being separated by four or five secondary thin veins, as seen in 

 the enlarged fig. 9 c, about as in Phragmites CEningensis. The other organs 

 which I refer to the same species, and seen enlarged in figs. 9 a and 9 h, are 

 two pallets and one seed. Of the first, one is broadly truncate at the base, 

 rapidly narrowed to a truncate or bicuspidate point; the other is narrower, 

 ovate-lanceolate, acuminate, rounded at base; both veined lengthwise. The 

 seed {b) is truncate at the base, short, oblong, or lingulate, very obtuse, smooth, 

 a little shorter than the pallets, but about of the same width, four to five 

 millimeters long, a little more than three millimeters broad. The seed has 

 not the form of those of Arundo; and, as these vegetable remains were found 

 in connection with Palms', they probably represent some Gramen of a trojiical 

 or warm climate, like the Bambusice. I have, however, been unable to find 

 any specimen with seeds for comparison. The stems and leaves of Ba?n- 

 husia arundinacea have the same nervation as that of our stem in fig. 9. 



Habitat. — Golden, Colorado; very rare, and found only in small frag- 

 ments. 



PHRAGMITES, Trin. 



Phragmites <Euingensis, AI. Br. 



Plate VIII, Figs. 1, 2. 



Phragmites fEningensis, Heer, Fl. Tort. Helv., i, p. 64, pi. xxii, fig. 5; xxiv, ixvii, fig. 86; xxijE, fig. 3«. — 

 Ludw., Palseont., viii, p. 80, pi. xvi, fig. 1 ; xviii, fig. 2; xxlv, fig. 7. — Ett., Foss. Fl. v. Bil., 

 p. 21, pi. iv, figs. 6-10. — Lesqx., Annual Report, 1870, p. 364; 1871, p. 289; Supplement to 

 Annual Report, 1871, p. 10 ; 1872, pp. 374, :576, 391, 399. 



Phragmiteaf CEningensis, Al. Br , Stizcnb. Verz., p. 75. 



Phragmites Zaniionii, Mass., Syn. Fl. Foss. Senogall., p. 8. 



Culmites arundinaceus, Ung., Ett., Fl. v. Vien., p. 9, pi. 1, fig. 1. 



Bambusium sepuUum, Andrie, Fl. Siebenb., pi. il, figs. 1, 3. 



Rljizomas large, creeping, articulate ; roots linear, with rootlets in right angle, placed in alternate 

 rows or indistinctly along the divisions; stems long; leaves large, distinctly veined, like the stems, 

 • without middle nerve. 



Fragments referable to this species, more common still in the European 

 T(;rtiary than in ours, have been found in most of the localities where Ter- 

 tiary fossil plants were discovered. The essential characters which serve to 

 idcntiiy them are the creeping, articulate rhizomas, bearing at or from the 



