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.
ACTINOMERS SQUARROSA, Nutt. Gen. 2, p. 131. Near Shawneetown, on the Canadian river;
August.
THELESPERMA GRACILIS, Gray in Kew Jour. Bot. 1, p. 252, & P1. Wright 1, p. 109. Denuded
prairies on the False Washita; August.
COSMOS BIPINNATUS, var. PARVIFLORUS, Gray, P1. Wright. 2 p. 90. Plains and pine woods in the
mountains near Laguna Blanca; September; (in fruit.)
BIDENS CEHRYSANTHEMOIDES, Michx. San Domingo, New Mexico, in wet places; October.
BIDENS TENUISECTA, Gray, Pl. Fendl. p. 86. Banks of the Pecos; October.
BIDENS BIPINNATA, Linn. Hurrah creek, in rocky places; September.
LEPTOSYNE DOUGLASIr, Di. Prodr. 5, p. 531. San Gabriel and Cocomungo, California; March.
PUGIOPAPPUS, Nov. Gen.
Capitulum, etc., fere Coreopsides; sed flores radii fceminei fertiles; tubus corolleea disci (fauce
infundibulari-campanulata hand longior) apice annulatus. Ovaria plano-obcompressa, ovalia,
glabra; radii ala angusta cincta, calva; disci marginata, pappo gerentia e squamellis 2
pugioniformibus triquetris, angulis anguste alatis denticulatis, corolla vix dimidio brevioribus,
constante. Herba monocarpica, pumila, glabra, subcaulescens, facie Leptosynis; caulibus
scapisve sub-1-2-foliatis monocephalis; foliis alternis pinnatisectis, segmentis cum rhachi
anguste linearibus; corollis radii et disci flavis.
PUGIOPAPPUS BIGELOVII. On the Mohave creek, in the desert east of the Colorado; March.
The accessions which may be expected are not unlikely to efface the distinctions between several
admitted genera, mostly founded on single plants, resembling Coreopsis or Bidens except in having fertile rays. The present plant, which we possess only in an early flowering state, approaches
the incompletely-known Narvalina, Cass. (a West Indian opposite-leaved shrub)in floral
characters, but it could hardly be joined to that genus with our present knowledge. It is to
Leptosyne much what Agarista is to some sections of Coreopsis; but it is distinguished by the
short tube of the disk-corolla, marked at the summit by a beardless ring, as well as by the
pappus; yet, from the analogous case of Coreopsis, one should not be surprised if future discoveries were to connect them.
HETEROSPERMUM TAGETINUM, Gray, P1. Fendl. p. 87. With the preceding.
SANVITALIA ABERTI, Gray, P1. Fendl. p. 87, & P1. Wright. 1, p.111. La Cuesta; September.
XIMENESIA ENCELIOIDES, Car. Plains from the Canadian to New M3lexico; September.
VERBESINA VIRGINICA, Linn.; Torr. & Gray, Fl. 2, p. 359. Prairies on the Canadian; August.
FLAVERIA ANGUSTIFOLA, Pers.; DC. Prodr. 5, p. 635. Sandy bottoms of the upper Canadian;
September. In all probability not distinct from F. Contrayerba.
DYSODIA CHRYSANTIIEMOIDES, Lagasca; DC. Prodr. 5, p. 640. Plains from the Canadian to
the Galisteo, New Mexico; August —October.
HYMENATHERUM (AcIPHYLLEA) ACEROSUM, Gray, P1. Wright. 1, p. 115. Bluffs of the Llano
Estacado; September.
HYMENATHERUM TENUIFOLIUM, Cass.; Gray, P1. Wright. 1, p. 118. Bill Williams' fork, West
New Mexico; February.
LOWELLIA AUREA, Gray, P1. Fendl. p.91, & P1. Wright. 1, p. 118. Dogtown prairies, on
the Llano Estacado, &c.; September.
GAILLARDIA PINNATIFIDA, Torr. in A4nn. Lyc. New York 2, p. 214; Torr. & Gray Fl. 2, p. 366.
Prairies of the Llano Estacado; September.
GAILLARDIA PULCHELLA, Foug.; Torr. & Gray, 1. c. Prairies on the Canadian; September.
PALAFOXIA HOOKERIANA, Torr. & Gray, Fl. 2, p. 368. Sand-hills on the Canadian, from
Shawneetown; August-September.
PALAFOxIA TEXANA, DC. Prodr. 5, p. 125. Shawneetown; with the foregoing species.
CHIENACTIS GLABRIUSCULA, DC. var. MEGACEPHIIALA. Hill-sides and near rivulets, at Knight's
ferry, on the Stanislaus, and Ione valley, California; May. Heads from 6 to 9 lines in length
Flowers yellow; the ray-corollas conspicuously ampliate. Pappus mostly of 4 silvery paled;
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