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. 7, Pt. 4

BOTANY.
MEDICACO DENTICULATA, Willd.; Torr. & Gray, 1. c. With the last, and also a naturalized
plant.
HOSACKIA PUBERULA, Benth. P1. Hartw. p. 305; Gray P1. Wright, 1, p. 50. Chiricahui
mountains, New Mexico; August.-(Tab. IV.)
HOSAcKIA CYTISOIDES, Benth.; Torr. & Gray, Fl. 1, p. 324. Salinas valley, California;
November. Foliage only.
HOsAcKIA SCOPARIA, Benth.; Torr. & Gray, Fl. 1. p. 325. Kikal Mungo and Warner's
ranch; March to May.
HOSACKIA STRIGOSA, Nutt. in Torr. & Gray, Fl. 1, p. 326. San Gabriel and Los Angeles;
March.
ASTRAGALUS (PHAcA) DENSIFOLIA. Phaca densifolia, J. E. Smith; Torr. & Gray, Fl. 1, p.
344 and 693; Hook. Ic. t. 2 and 3. P. Nuttallii, Torr. & Gray, 1. c. San Gabriel and San
Bernardino; March.
HOMALOBUS MULTIFLORUS, Nutt. in Torr. & Gray, Fl. 1, p. 350. Santa Inez. January,
flower and young fruit. This agrees very well with Nuttall's specimens, but better with Phaca
nigrescens, Hook., which we refer to H. multiflora.
LUPINUS IIIRSUTISSIMUS Benth.; Torr. & Gray, Fl. 1, p. 372. San Gabriel and Santa Clara
valley; February and March.
LUPINUS ORNATUS, Dougl.; Torr. & Gray, Fl. 1, p. 380. San Juan, California; November.
A fine shrubby species, well deserving a place in the flower garden.
HOFFMANSEGGIA STRICTA, Benth. in Gray, P1. Wright, 1, p. 56. Ojo de Vaca; August.
CASSIA LINDIIEIMERIANA, Scheele; Gray, P1. Lindheim. 2, p. 179. San Pedro and Burro
mountains, New Mexico; July and August. In all the specimens the leaves have but three
pairs of leaflets, and they are smaller than in the ordinary form of the plant.
OLNEYA TESOTA, Gray, P1I. Th7urb. p. 328. On diluvial hills of the Colorado river, near Fort
Yuma; March. This, according to Mr. Thuber, is the Tesota of the Mexicans, but Mr. Schott
informs us that its more common name is Arbol de hierro, and that the Acacia Greggii is the
true Tesota. There is, however, but little dependence to be placed on the common names of
plants, especially among rude and ignorant people.-(Tab. V.)
AcACIA GREGGII, Gray, P1. Wright, 1, p. 65. Vallecitas, west of the Colorado; May, in
flower; Burro mountains; August, in fruit.
AcACIA CONSTRICTA, Benth. in Gray, PI1. Wright, 1. c. On the San Pedro, a tributary of the
Gila; July.
ACACIA CUSPIDATA, Schlecht.; Gray, P1. Wright, 1, p. 66. San Pedro river, and Chiricahui
mountains; July.
STROMBOcARPA PUBESCENS, Gray, P1. Wright, 1, jp. 60. Prosopis (Stromnbocarpa) pubescens,
Benth. P. (Strombocarpa) Emoryi, Torr. in Emory's lyep.p. 139. P. odorata, Torr. im'rerm.
2d Report, p. 313 (the fruit only.) Common along the Gila and about San Felipe, &c., California. This is the Screwbean or Screw 2Iesquite. The Sonora Mexicans call it Tornillo. The
figure in Fremont's second report is made up of the foliage and flowers of Algarobia glandulosa
and the fruit of Strombocarpa; an error that arose from a mixing of the specimens in the
original collections. I have, therefore, in the botany of Williamson's report, given a new
figure of this important tree, the fruit of which yields food to man and beast.
ALGAROBIA GLANDULOSA, Torr. & Gray,'T. 1, jp. 399. Prosopis glandulosa, Torr. in Ann.
Lye. N. York, 2, p. 192, t. 2. Common along the Gila river. Fine specimens, with pods 9 or
10