DESCRIPTION OF SPECIES— GEAMINE^. 87 



Arundo reperta, Lesqz. 



Plate VIII, Figs. 6-8. 



Arundo reperta, Lesqx., Annual Report, 1874, p. 311. 



Stem thick, distantly articulate ; surface striate, marked with round, obtuse knots, either placed at 

 the articulation or here and there scattered upon the stem; fruiting panicle crushed, oval-oblong, 

 bearing ovate-lanceolate seeds and pallets mixed with a coating of hairs. 



The specimen figured as marked above is very interesting, and proves 

 indeed, by the characters of the preserved organs, the reference of this plant 

 to the genus Arundo. The thick stern, two and a half centimeters broad, 

 somewhat flattened, very closely nerved or striate, with veins twice as close 

 as they are in the former species, is distinctly and' distantly articulate, with an 

 indistinct knot under the convex narrow ring of the joint, and two larger 

 convex tubercles at a distance above, in the middle of the stem. The same 

 specimen bears a crushed ear, where glumes or pallets and seeds are mixed 

 with a coating of short filaments, apparently hairs. The pallets in fig. 7 a are 

 ovate-lanceolate, acuminate, rounded at the base, evidently veined in the lower 

 part, slightly turned to one side at the point or straight. The seeds in fig. 7 b 

 are shorter, but as broad at the truncate or subcordate base, ovate-lanceolate, 

 pointed, striated on the borders around the convex central nucleus, measur- 

 ing six millimeters from the base to the point and two and a half millimeters 

 across below the middle. The same specimens bear numerous fragments of 

 stems and rhizomas, or roots, like the one in fig. 8, which are all flattened, exactly 

 linear, irregularly striate, and marked without order, or here and there with 

 oval concave impressions, in the form of rings around central points, evidently 

 scars of rootlets. As remarked above, these fragments may possibly repre- 

 sent the same species as the former. The stem, however, is more closely stri- 

 ate than the large one in fig. 3 of the same plate. It is comparable to that of 

 Phragmites CEningensis, Al. Br., as figured by Heer (Spitzb. Fl., pi. vi, fig. 16). 

 A pallet referable to the same species is also represented in fig. 15 of the same 

 work; it is oval-Ianceolate-obtuse, narrower than that of our species. 



Habitat. — Cut-off above Green River Station, Wyoming Territory 



{Dr. F. V. Hmjden). 



Am II do? obtiisa, Lesqx. 



Plate VIII, Figs. 9-9 c. 



Arundo obtusa, Lesqx., Annual Report, 1874, p. 311. 



Stem doubly veined, obscurely articulate, slender ; primary nerves somewhat thick, with four or 

 five intervening thinner secondary veins ; pallets broadly ovate-lanceolate, acuminate or truncate ; seeds 

 large, obtuse, truncate at base. 



The different organs preserved all together upon the same specimen in 



