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.
of two or more feet in height; the branchlets whitish or yellowish, but with scarcely a perceptible pubescence. Leaves more hoary, about an inch long, involute-filiform, slender. Heads
fasciculate, 9 or 10 lines long, about a line and a half in diameter, therefore more slender than
those of L. pulchella; the scales of the involucre almost as strikingly five-ranked as in that
species, but thinner, not -so sharply carinate, not green on the back, and not so much pointed,
the somewhat scarious margins, especially of the outer ones ciliate with arachnoid and apparently viscid hairs. Corolla, style, and the slender achenia nearly as in L. pulchella; but the
bristles of the pappus rather less copious, evidently finer and softer, and unequal in length
therefore intermediate between that of the latter species and of L. graveolens. This species is a
peculiarly interesting discovery, on account of the transition it establishes between L. pulchella,
a strikingly aberrant form, and the rest of the group to which I had referred to that plant.
LINOSYRIS (CHRYSOT1IAMNUS) PULCIIELLA, Gray, P1. Wright. 1, p. 96, & 2, p. 80; Torr. it
Sitgreaves' Rep. t. 4. Gravelly hills on the upper Canadian, September. The margins of the
leaves are denticulate-ciliolate, which was not observed in Mr. Wright's specimens. Dr. Schultz
(Bipont,) informs me, in a letter, that he has indicated this as a new genus, "Tetragonospermum
pulchellum, C. H. Schultz, Mss." I think that the preceding species forbids its separation from
Nuttall's Chrysothamnus, whatever view we take of that group.
APLOPAPPUS (BLEPHARODON) SPINULOSUS, DC. and var. GLABER, Gray, Pl. Fendl. p. 75. On
the Canadian, and Deer creek; August, September.
APLOPAPPUS (BLEPHARODON) RUBIGINOSUS, Torr. & Gray, Fl. 2, p. 240. Sandy bottoms of the
Canadian; September.
APLOPAPPUS (PRIONOPSIS) CILIATUS, DO. Prodr. 5, p. 346; Gray, Pl. Wrtght. 1, P. 98. Prairies
on the Canadian; September.
APLOPAPPUS (ISOPAPPUS) DIVARICATUS. Isopappus divaricatus, Torr. & Gray, Fl. 2, p. 239.
Sand-banks of the Canadian, near the Shawnee villages; August. A state with rather larger
heads, approaching Isopappus Hookerianus, which most probably is not distinct.
APLOPAPPUS (ERICAMERIA) LARICIFOLIUS, Gray, P1. Wright. 2, p. 80. White Cliff creek, New
Mexico; on hills and rocks. Caion creek, Western New Mexico. The flowers have all fallen;
but there is little doubt about- the species, which Dr. Bigelow formerly gathered in the Organ
Mountains, near El Paso.
AMMODIA OREGANA, Nutt. i Trans. Amer. Phil. Soc. 7, p.321; Torr. & Gray, Fl. 2, p 235,
California, on the Stanislaus; May 8. This was also gathered in northern California by the
United States South Sea Exploring Expedition, and by Mr. Allen on the Yuba river.
STENOTUS LINEARIFOLIUS, Torr. & Gray, Fl. 2, p. 238. Caion Pass, New Mexico; March 16,
1854; California.
CHRYSOPSIS HISPIDA, Hook.; Nutt. in Trans. Aimer. Phil. Soc. n. ser. 7, p. 316. Sandstone
rocks and hills, on the Canadian; August-September.
CHRYSOPSIS ROLIOSA, Nutt. 1. c. Hilly prairies on the Canadian; September. Intermediate
between C. villosa and C. canescens.
HETERoTHECA -GRANDILORA, Nutt. to Trans. Amer. Phil. Soc. n. ser. 7, p. 315. Cocomungo,
California.
GRINDELIA HIIRSUTULA, Hook. & Arn. Bot. Beech. p. 147 & 351. Hill-sides, at Knight's
ferry, on~the Stanislaus, California; May 7. A narrow-leaved state.
PENTACH_TA AUREA, Nutt. 1. c.; Torr. & Gray, Fl. 2, p. 249. Corte Madera, California;
April. Very like Nuttall's original specimens, except that the leaves are broader.
APHANTOCHlET, ANov. Gen.
Capitulum heterogamum, 8-10-florum; floribus radii 3-5 femineis, tubulo corolla stylo
breviore truncato eligulato; disci 4-5 hermaphroditis, corolla tubuloso-infundibuliformi apice
5-dentata. Involucrum circiter 10-phyllum, biseriale; squamis equalibus oblongis membranaceis
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