Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean: Vol. 2, Pt. 4

BOTANY.
ACTINOMERIS HELIANTHOIDES, Nutt. Gen. 2, p. 181. Near Fort Washita; April.
THELESPERMA FILIFOLIA, Gray, in Hook. Kew. Jour. Bot. 1, p. 252, and Pl. Wright. 1, p.109.
Head-waters of the Colorado; April. Also probably T. GRACILIS; but not yet in flower.
COREOPSIS GRANDIFLORA, Nutt.; Torr. and Gray, Fl. 2, p. 345. On the Colorado; April.
COREOPSIS TINCTORIA, Nutt. Near Fort Washita; April.
CHRYSACTINIA MEXICANA, Gray, PI. Fendl. p. 93. Near Independence Spring; March. Without flowers.
HYMENATHERUM (AcIPHYLLEA) ACEROSUM, Gray, PI. Wright. 1, p. 115. On thlle Pecos and
Llano Estacado; March, April.
HYMENATIIERUM PENTACIIATUM, DC. Prodr. 5, p. 642. On the Pecos; March.
AGASSIZIA SUAVIS, Gray and Engelm. P1. Lindh. 2, p. 220. Western Texas; April.
GAILLARDIA AMBLYODON, Gray; Torr. and Gray,'T. 2, p. 267; Gray, Chl. Bor.-Am. t. 4.
Western Texas; April.
GAILLARDIA PINNATIFIDA, Torr. in Ann. Lyc. New York, 2, p. 214; Torr. and Gray,'T. 2, p.
366. Llano Estacado to the Colorado; March, April.
GAILLARDIA PULCHELLA, Fougeroux; Torr. and Gray, 1. c. Western Texas; April.
HYMENoPAPPUS CORYMBOSUS, Torr. and Gray, TFl. 2, p. 272. On the Colorado, &c.; April.
BARIA ABSINTrIFOLIA, Benth. var. DEALBATA, Gray, P1. Wright. 1, p. 121. On the Pecos;
March.
RIDDELLIA TAGETINA, Nutt.; Torr. and Gray, Fi. 2, _p. 262; Torr. in Eriiory'8 se. t.5.
Llano Estacado; March.
AMBLYoLEPIS SETIGERA, DC. Prodr. 5, p. 568; Gray, P1. Wright. 1, p. 121. From the Llano
Estacado to the lower Celorado; March, April.
ACTINELLA SCAPOSA, Nutt. in Torr. and Gray, Fl. 2, p. 382. On the Pecos and Llano Estacado; March.
ACTINELLA LINEARIFOLIA, Nutt.; Torr. and Gray, 1. c. On the Pecos.
ACTINELLA RICHARDSONII, Nutt. Picradenia Richardsonii, Hook. Near the Pecos; March.
IHIELENIUM TENUIFOLIUM, Nutt.; Torr. and Gray, Fl. 2, p. 385. Western Texas; April.
MARSEALLIA CSPITOSA, Nutt. in DC. Prodr. 5. p. 680. On the upper Colorado; April.
AcHILLEA MILLEFOLIUM, Linn. Near Fort Washita and on the Colorado.
ARTEMISIA WACUNCULOIDES, Pursh; Torr. and Gray, Fl. 2, p. 216. Sacramento river to
the Llano Estacado; March.
ARTEMISIA LEWISII, Torr. and Gray, Fl. 2, p. 217. Pecos to the Llano Estacado; March.
ARTEMISIA LUDOVICIANA, Nutt.; Torr. and Gray, Fl. 2, p. 420. Cotton-wood Springs, New
Mexico, &c.; March.
GNAPHALIUM LUTEO-ALBUM, Linn. New Mexico and Western Texas.
SENECrO FILIFOLIUS, Nutt. var. JAMESII, Torr. and Gray, Fl. 2, p. 444. On the Pecos and
upper Colorado.
SENECIO LOBATUS, Pers.; Torr. and Gray, 1. c. Western Texas; April.
CIRSIUM VIRGINIANUM, Mlichx.'Fl. 2, p. 90. Western Texas; April.
CIRSIUM UNDULATUM, Spreng.; DC. Prodr. 6, 2. 651. Llano Estacado, &c.
CENTAUREA AMERICANA, Nutt. Near Fort Washita; April.
PEREZIA NANA, Gray, P1.'Fendl. jp. 111. On the Pecos; March. The foliage only.
APOGON EUMILIS, Eli. Sk. 2, p. 267. Western Texas; May.
KRIGIA OCCIDENTALIS, Nutt.; Torr. and Gray,'FT. 2, o. 467. Western Texas; May.
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