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.
IPOMAEA NIL, Roth; Pharbitis Nil, Ghoisy in DC. Prodr. 9, p. 343. On the Organ mountains, New Mexico; August.
CALYSTEGIA SEPIUM, B. Brown; Choisy in DC. Prodr. 9, p. 433. Santa Barbara; February.
With much smaller leaves and flowers than usual.
EVOLVUILUS ARGENTEUS, Pursh, Fl. 1, p. 187. Nutt. Gen. 1, p. 174. E. pilosus, Nt. in
Trans. Almer. Phil. Soc. (n. ser.) 5, p. 194. Ojo de Vaca; August.
NAMA BIFLORA, Choisy in DC. Prodr. 10, p. 183., var.? SPATHULATA: annual, erect when
young, but finally prostrate or diffuse, pubescent; leaves linear or oblong, spatulate, obtuse;
flowers solitary in the axils, or 2-3 together in terminal leafy racemes; sepals spatulatelinear; corolla nearly twice as long as the calyx. N. Jamaicensis? Engelm. and Gray, P1.
Lindh. 1, p. 183. On the Gila river; June. A common plant in New Mexico and in southern California. It is variable in the breadth of the leaves, and is probably distinct from N.
Jamaicensis. N. undulata, H. B. K., grows in New Mexico, unless what I have so called may
be only another form of this species.
GILIA TRICOLOR, Benth. in Bot. Beg. sub No. 1622. Los Angeles; March. A small early
form.
GILIA MICRANTHA, var. AUREA, Benth. P1I. Lartw., p. 325. G. aurea, Nutt. P1. Gamb.,. 55,
t. 22? Santa Clara to Los Angeles; March.
GILIA LONGIFLORA, Don.; Torr. in Sitgreave's ep., p. 165, t. 7. Cantua longiflora, Torr. n
Am4. Lye. N. York, 2, p. 221. Los Playas and Sauz valley; August.
GILIA INCONSPICUA, Dougl. in Bot. Mag., t. 2883. Between Santa Clara and Los Angeles;
February and March.
GILrA DENSIFOLIA, Benth. in DC. Prodr. 9, p. 311. San Felipe and Cariso creek; May-June.
GILIA DIANTHOIDES, Endl. Atakt., t. 29; Benth. 1. c. Santa Barbara, Los Angeles, &c.;
March. Taller than usual.
GILIA ANDROSACEA, Steudel, Nomencl.; Benth. l. c. Warner's ranch; May. Calyx yellow,
Corolla pale lilac.
GILIA CALIFORNICA, Benth. in DC. Prodr. 9, p. 316. Leptodactylon Californicum, look.
& Amrn. Bot. Beechey, p. 369, t. 89. Santa Inez Mission and Santa Clara valley; February.
A shrubby species, sometimes attaining the height of four or five feet.
NAVARRETIA SQUARROSA, Hook. and Arn. 1. c.; Benth. 1. c. var. DIFFUSA: Stems diffusely branching; cells of the capsule 7-8 seeded. Salinas valley; November.
SOLANUM UMBELLIFERUM, Eschsch. Mem. Acad. St. Petersb. 10, p. 281; Dunal in DC. 13,
pars 1, _p. 93. S. genistoides, Dunal, 1. c.? San Jose valley; November.
S. UMBELLIFERUM, var. GLABRESCENS: nearly glabrous; leaves oblong-lanceolate, acute or attenuate at the base. Santa Inez; also between San Bernardino and San Gabriel; January.
S. UMBELLIFERUM, var. INCANUM: hoary-pubescent; leaves oblong, small, (6-10 lines long,)
entire. S. Californicum, Dunal, 1. c.? Head-waters of San Antonio river, California;
December. Berry the size of a small musket ball, black when dry.
S. UMBELLIFERUM, var. TRACHYCLADUM: branches angular and somewhat winged, the angles
denticulate-scabrous, otherwise smooth; leaves ovate, smoothish, repandly toothed, abruptly
narrowed to a petiole at the base; racemes on long peduncles, somewhat umbellate; calyx 5-cleft
to the middle, the segments semiovate and rather acute. Santa Inez and San Buenaventura
ranch; February. Stem shrubby, 2-3 feet long, apparently prostrate, fistular. Leaves 1A-2
inches long, exclusive of the petiole, which is about half the length of the lamina, nearly
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