BOTANY. 131 
tuft; at the very bottom the claw is dark purple. Differs from C. venustus in its much nar- 
rower and less bearded petals, and in wanting the red spot above the middle. 
Atuium cernuum, Roth; Kunth, Enum. 4, p. 435. Roubideau’s Pass. Differs from the 
description of A. cernuum, in the ovary being 6-toothed, or rather with 3 short processes, each 
of which is 2-lobed. 
CAREX VULPINOIDEA, Michx, Fl. 2, p. 69; Torr. Fl. N. York 2, p. 376. (©. multiflora, Mudl. 
in Willd. Spec. 4, p. 233; Schk. Car. t. Lil. f. 154. Between Westport and Bent’s Fort. 
ScrRPUS LINEATUS, Miche. Fl. 1, p. 32; Torr. Cyp. p. 332. In thickets, Upper Arkansas. 
S. Lacustrris, Linn.; Muhl. Gram. p. 32; Torr. Cyp.p. 221. Bluff Creek. 
Cyprus FiLicuLMis, Vahl, Enum, 2, p. 328; Torr. Cyp. p. 267. C. mariscoides, Elliott, Sk. 
1, p. 67. Prairies near Fort Atkinson. 
BovuTELOUA CURTIPENDULA, Forr. in Emory’s Report, p. 153. B. racemosa, Torr. Fl. N. York 
2, p. 449; not of Lag. Chloris curtipendula, Miche. Fl. 1, p. 59. Atheropogon apludoides, 
Muhl. Gram, p. 287. Prairies, Upper Arkansas. 
CHONDROSIUM OLIGOsTACHYUM, Torr. in Marcy’s Report, p. 300. Atheropogon oligostachyum, 
Nutt. Gen. 1, p. 78. Eutriana? oligostachya, Kunth, Enum. 1, p. 96, and 2, p. 282. On the 
Upper Arkansas. 
SESLERIA DACTYLOIDES, Nutt. Gen. 1, p. 65; Kunth, Enum. 1, p. 323; Torr. in Emory’s 
Report, p. 323, t. 10. With the last. The flowers are all male in the specimens of this collec- 
tion. There are thrown out from the root, besides the upright flowering culms, long prostrate 
runners which produce short verticillate branches and tufts of leaves at the joints, where they 
also frequently strike root. 
Anpropocon Torreyanum, Steud. Syn. Gram. p. 302. 
A. James, Torr. in Marcy’s Report, p. 302. A. glaucum, Torr. in Ann. Lyc. N. York 1, 
p. 153; not of Muhl. Sources of the Arkansas. 
SPARTINA cyNosuROIDES, Willd. Enum. 1, p. 80; Torr. Fl. N. York 2, p. 448, ¢. 153. Low- 
lands of the headwaters of the Arkansas. 
TripsacuM DAcTYLOIDES, Linn.; Kunth, Enum. 1, p. 469; Steud. Gram. p. 362. Plains of 
the Arkansas. 
Eymus Canapensis, Linn.; Kunth, Enum. 1. 451; Torr..l. c. 476. Between Westport and 
Bent’s Fort. 
PANICUM CAPILLARE, Linn.; Kunth, Enum.1,p. 114; Torr. 1. c.p.426. With the preceding. 
Panicum Crus-eaul, Linn.; Torr. Fl. N. York, 2, p. 424. Damp places. Upper Arkansas. 
The flowers are hispid and mostly awnless. 
EXPLANATION OF THE PLATES. 
Plate I. Viota Brckwirutt. 
Fig. 1, the petals; 2, vertical section of a flower; 3, 4, 5, stamens; 6, pistil; 7, capsule and 
calyx. All magnified. 
Plate II. Smpatcea cANDIDA. 
Fig. 1, vertical section of the column, ovary, &c.; 2, upper part of the stamineal column, 
entire; 3, fruit, of the natural size; 4, fruit and calyx; 5, a mature carpel; 6,aseed. All 
but 3 sonpensiied: 
