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.
TRIFOLIUM BARBIGERUM, (sp. nov.): nanum, molliter pubescens; caulibus e radice annuavel bienni
adscendentibus, (1-3 poll. longis,) junioribus stipulis scariosis apice truncato setaceo-laciniatis
iimbricatum vestitis; foliolis obovatis cuneatisve obtusissimis denticulatis; involucro cyathiformi laciniato aristato-dentato flores suboquante; calycis dentibus tubo fere triplo longioubus
aristiformi-subulatis plumoso-barbatis, infimo simplici preasertim supremo bi-trifidis; leguminibus dispermis. Near San Francisco, April. The Rev. A. Fitch collected this'plant in the
same place, four or five years ago.
MELILOTUS PARVIFLORAA Desf. Fl. A4tl. 2, p. 192; Torr. & Gray, Fl. 1, p. 321. Common in
New Mexico and California, on banks of streams; probably introduced.
MEDICAGO DENTICULATA, Willd. Sp. 3, p. 1414; Torr. & Gray, Fl. 1, p. 332. Cocomungo,
California; March 18. Introduced.
HOSACKIA BICOLOR, Dougi'. et Benth. in Bot. Beg. t. 1257; Hook. F'. Bor.-Arm. 1, p.134;
Torr. & Gray. F7. 1, p. 323. Hills near Punta de los Reyes; April 17; and wet ravines, Grass
Valley, California; May 19. A showy perennial species. The stipules are not always'' very
obtuse," but are sometimes rather acute.
HOSACKIA STOLONIFERA, Lindl. Bot. Beg. t. 19'77; Torr. & Gray, F'71! p. 323. River banks,
Mokelumne Hill, and Mammoth grove, California; May 15-17. Var. PUBESCENS. Corte Madera,
April 16. In this variety the peduncles are sometimes naked, and sometimes (even on the same
specimen) furnished with a sessile, unifoliolate, or pinnately 2-7-foliolate bract. The whole
plant is conspicuously pubescent.
HOSACKIA GRANDIFLORA, Benth. in Bot. Reg. sub. t. 125.7; Torr. & Gray, Fl. 1, p. 323. Hillsides, mouth of the Yuba, California; May 21. The bract is occasionally trifoliolate, and
not unfrequently it is wanting altogether, or only rudimentary.
HOSAcKIA PUBERULA, Benth. P1. Hartw., p. 305; Gray, P1. Wright. 1, p. 50. On Williams' River of the Colorado, western Mew Mexico, February 11.
HOSACKIA (EUHOSAcKIA) INCANA (Sp. nov.): perennis, undique et mollissime cano-villosa; caule
erecto simplici; foliolis 11-13 ovatis acutiusculis; stipulis ovatis folioformibus; peduncuis folio
multo brevioribus; umbellis 6-9-floris; bractea 5-foliolata; fioribus pedicellatis; calycis dentibus
subulato-lanceolatis tubo duplo brevioribus. (Tab. IV.) Dry hills, near South Yuba, California;
May 23. Plant 6-10 inches high, densely clothed with soft greyish-white villous pubescence. Stem
rather stout, leafy. Leaflets nearly half an inch long, mostly opposite, varying from broadly
to narrowly ovate. Stipules about two-thirds the size of the leaflets, and resembling them in
form. Peduncles (floriferous) half an inch or more in length. Flowers as large as in H.
bicolor, apparently purple, mixed with yellow; the pedicels about one-third the length of the
calyx. Pods not seen. Allied to H. stipularis, but abundantly distinct.
HOSACKIA PARVIFLORA, Benth. in Bot. Beg. sub t. 1257; Torr. & Gray, Fl. 1, p. 326. lapa
Valley, April 25. Hills near Punta de los. Reyes, and Tomales bay, April 17-19. H. microphylla and H. nudiflora of Nuttall seem to be only reduced forms of this species.
HOSACEIA STRIGOSA, Nutt. in Torr. & Gray, P1. 1, p. 326. Cocomungo, March 26. We
think that H. rubella, Nutt., should be united to this species.
HOSACKIA SUBPINNATA, Torr. & Gray, 1. c. Lotus subpinnatus, Lagas. Gem. and Sp.p. 33;
Hook. & Arm. Bot. Beech., p. 17, t. 8. Corte Madera, April 10; hill-sides, Martinez, California;
April 23.
HOSACKIA PURSEIANA, Benth. 1. c.; Torr. & Gray, 1. c. Lotus sericeus, PPursh,:7. 2, p. 489.
Low ravines, Grass valley, May 19. The four remaining species of the section Psycopsis of
Nuttall (n Torr. & Gray, 7l. 1. c.) are probably only forms of H. Purshiana.
HOSACKIA CYTISOIDES, Benth. l. C.; Torr. & Gray, 1. c. Near San Francisco. Bracts mostly
unifoiolate.
ROBINIA NEO-M ExcANA, Gray, P1. Thurb., p. 314. Mountain arroyos, near San Antonita,
New Mexico; October. In fruit.
GLYCYRRHIZA LEPIDOTA, Nutt. Gem. 2, p. 106. Sand banks of the Canadian, near the Shawnee
villages; August. With ripe fruit.
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