DESCEIPTION OF SPECIES— MONOCOTYLEDONES. 85 



the same form as in fig. 41, but much larger, has six of these inflated veins, 

 passing up from the base, parallel to the secondary veins, and the midrib is 

 there indistinguishable. As far as they are known, the leaves vary in size from 

 four to seven centimeters long, and from two te three centimeters wide across 

 their upper divisions. The secondary veins are very thin, scarcely distin- 

 guishable without a glass, close, nearly straight up or slightly curved to the 

 borders, forking in ascending. As remarked above, the specimen in fig. 40 is 

 obscure, the veins indistinct, and the surface variously folded in the direction 

 of the veins. Its reference to this species is not positively ascertainable. 



Habitat. — Six miles above Spring Canon, near Fort Ellis {Jas. Savage). 



MONOCOTYLEDON ES. 



GLUMAOE^. 



G?-amine(E and Cyperacece are as yet poorly represented in the North 

 American Tertiary flora; not so much on account of the deficiency of speci- 

 mens as from the impossibility of determination of fragments of leaves or 

 blades whose reference, even generic, is always problematic. I have, there- 

 fore, abandoned a number of species which I had formerly described as 

 Cyperites : Cyperites angustior?, Al. Br (Annual Report, 1872, p. 403); C. 

 Braunianusl, Heer (Annual Report, 1871, p. 285), which is characterized 

 especially by its tubercles, while our specimens represent merely fragments 

 of stems without them; C. Deucalionis?, Heer (Annual Report, 1871, p. 

 285; Poacites Icevis, Heer (Annual Report, 1870, p. 385), etc., a fragment of 

 which traverses fig. 1 of pi. xliii. As the determination of these species is 

 still uncertain from far better specimens than those which we have in our 

 possession, and as none better of the same kind have been discovered since 

 1870, it is advisable to leave them as undeterminable until others are found, 

 which may afibrd some more light by the possibility of comparison. As seen 

 in the description of species of Arundo, which are represented with positive 

 characters, those of the seeds with glumes and pallets, and also of a Carex, 

 we may expect from further researches important discoveries, and, therefore, 

 the opportunity of more evident references for the fragments which are until 

 now of uncertain affinity. 



