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. 4, Pt. 3

BOTANY.
Palee of the pappus oblong, or the alternate ones oval, about one-sixth of the length of the
corolla, scarcely longer than the breadth of the achenium. Receptacle proportionately largey
ovoid-conical.
I append the characters of what must be regarded as a new genus, allied to Bahia, Burrielia
and Actinolepis, and remarkable for its multisetose rather than paleaceous pappus.
SYNTRICHOPAPPUS, Nov. Gen.
CAPITULUM multiflorum, heterogamum; floribus radii 5 ligulatis foemineis; disci tubulosis
herm-aphroditis. Involucrum obovatum, e squamis 5 erectis membranaceis discum equantibus.
Receptaculum convexum, nudum. Corolla glabra; disci infundibuliformes, limbo quinquelobo,
lobis lineari-oblongis; ligulw breves, late ovales, apice trilobe. Anthers lineares, in appen
dicem lanceolatam longe productsee. Styli rami fl. disci appendice triangulata complanata lispidula conspicua superati. Ovaria oblongo-linearia, hirsuta. Pappus (radii et disci conformis)
e setis plurimis (35-40) uniserialibus filiformibus hispidulis cqualibus basi inter se pl. m.
coalitis constans, corolla disci paullo brevioribus. Herba monocarpica, e basi ramosa, depressa,
floccoso-lanata, deinde glabrescens; foliis alternis cuneato-spathulatis apice trilobatis; capitulis
breviter pedunculatis; floribus flavis.
SYNTRICIOPAPPUS FREMONTII. (TAB. XV.) Gathered by Colonel Fremont (a single specimen) in
his journey across the continent in 1853-4, probably in the spring of 1854, and somewhere between
the Rocky Mountains and the Sierra Nevada. A small herb intermediate in habit between
Actinolepis, DC., and Bahia ~ Trichophyllum. Leaves 6 to 10 lines in length, tapering fron
the summit into a long, narrowed base. Heads somewhat glomerate on the branches, 3 lines
long. Scales of the involucre concave, with narrow scarious margins. Pappus white, composed of 30 to 40 uniform and equal slender bristles, which are all usually connate at the very
base into a ring, so as to fall away together; and also for the most part further united in twos,
threes, &c.; the combined base somewhat paleaceous.
AMBLYoPAPPUS NEO-MEXICANUS. Schkuhria (Amblyopappus vel Achyropappus ligulus nullis)
Neo-Mexicana, Gray, P1. Fendl,'.. 96. Hills and rocky places near La Cuesta, &c., between
the Pecos and the Rio Grande; September. The same as Fendler's No. 458. Except in the
want of rays, this is an Achyropappus; the species of which (along with an unpublished one
gathered, by Dr. Bigelow on the Limpio, in 1852, Bahia (Achyropappus) Bigelovii) I am unable
to keep generically separate from true Bahia. Its characters accordingly associate it with Amblyopappus, Hook. d& Arn. (Aromia, Nutt.; Infantea, Remy,) which may perhaps be kept
distinct for the sake of convenience, unless, as is likely, radiate and rayless heads should occur
in the same plant.
VILLANOVA CHRYSANT]iEMOIDES, Gray, Pl. WrigIht 2, p. 96. Rocky places near Hurrah creek
September. In a few heads some traces of a chaffy pappus were detected, showing that this is
really only an epappose Bahia.
MONOLOPIA MAJOR, DC. Prodr. 6, p. 74. A small form, Napa valley, Feather river, &c., California'; May.
MONOLOPIA LANCEOLATA, gt. Pl. Gamb. in Jour. Acad., Phtilad., n. ser. 1, S. 175. Los Angeles, California; March. This comes from the same district as Nuttall's M. lanceolata, and
was likewise gathered by Coulter, (No. 323.) The leaves are lanceolate, nearly all toothed,
and less woolly than those of M. major; but the lowest are opposite, and the scales of the involucre are united to about the middle.
LASTRENIA (HOLOGYMNE) GLABRATA, Lindl.; DC. Prodr. 5, p. 665. Near Tamul-Pass Mountain, California; April 11.
BunRIELIA (BAEBIA) cERYSOSTOMA, Corr. & Gray, Fl. 2, p. 379; and var. MACRANTHA. San
Francisco; the variety on hills near Punta de los Reyes, California; April. The stems, foliage,
&c., of the variety accord with the larger states of Burrielia chrysostoma; but the head is of
extraordinary magnitude, the involucral scales being half an inch, and-the rays an inch in length
106,