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

specimens are all female, and mostly in fruit. The plant is of a light-brown when dry. Dr.
Engelmanu (1. c.) was inclined to refer A. Oxycedri of Hooker's Fl. Bor.-Amer. to this species,
but seeing that plant in my herbarium, he thought it was probably A. Americana, Nutt.
ARCEUTHOBIUM OXYCEDRI, AJ. Bieb.? A. campylopodum, var. macrathron, Engelm. 1. c.? On
Libocedrus decurrens, Duffield's Ranch, California. The female plant only. A foot long, and
of a dark-brown when dry. Stems stout; the branches long and slender, somewhat quadrangular above; the length of the joints 2-3 times more than the diameter. Female flowers
mostly 3-cleft. From the Rev. A. Fitch we have specimens of what is undoubtedly Engelmann's
plant, collected on a Pinus between Stockton and Stanislaus. It is much smaller than the
specimens from Duffield's Ranch, and the color is light-brown.
SAURURACE.E.
ANEMOPSIS CALIFORNICA, Nutt. in Tayl. Ann. Nat. Hist. 1, p. 136; Hook. & Arn. Bot. Beech.
p. 390 t. 92. Wet places on the Rio Grande, near Albuquerque; October.
CALLITRICHACEA,.
CALLITRICHE VERNA, Linn p.. 1, p. 6; Torr. Fl. N. York, 2, p. 170, var. vulgaris, DC.
Prodr. 3, p. 70. In water, near Tamul Pass, California; April 11. Styles twice as long as
the fruit.
CALLITRIOHE MARGINATA n. sp.: fructibus longepedunculatis; carpellis parallelis dorso alatomembranaceis; foliis lineari-spathulatis trinerviis. Muddy places along Mark West's creek,
California; April 30. Upper California; Rev. A4. Fitch, (locality not recorded.) Stemslender,
branching, rooting in the mud. Leaves about one-third of an inch long, distinctly 3-nerved.
Styles at first spreading, but finally reflexed over the fruit. Peduncles about two-thirds as
long as the leaves, spreading or reflexed. Carpels strongly margined, or with a narrow wing
on the back from thie base to the summit. A well characterized species, resembling C. Nuttallii; nob. (C. pedunculosa, Nutt. in Trans. A4mer. Phil. Soc. n. ser. 5, p.140; not of Arnott,
nor C. pedunculata DC.), but differs in the winged fruit. In C. Nuttallii the leaves are very
obscurely 3-nerved, not veinless, as they are described.
DATISCACEiE.
TRICERASTES GLOMERATA, Presl, Bel. Hcenk. 2, p. 88, t. 64; -Benth. P1. Hartw. p. 335, No.
1951. Mokelumne Hill, and sides of rivulets, Sonora, California; May. Our observations on
the male flowers of this genus agree with those of Bentham 1. c. We have not seen the hermaphrodite flowers which he describes.
EUPHORBIACEYE.
EUPHORBIA LEPTOCERA, Engelm. Mss. in herb. Torr. Prairies of Grass Valley, California; May
20, (fl. and fr.) We-regret having mislaid Dr. Engelmann's description of this species. It
will, however, be contained in his Monograph of North American Euphorbie, which will be
published in a few months. The plant has a strong resemblance to E. Peplus, but is more
nearly allied to-E. commutata, Engelm., (in Gray'8- Manal, ed.' 2,. 389,) Tom which, indeed,
it is difficult to distinguish it.
EUPHORBIA MELANADENIA (sp. nov.): caule procumbenteiramosissimo herbaceo; foliis breviter
petiolatis suborbiculatis inequaliter cordatis crassiusculis integerrimis dense cano-pubescentibus;
stipulis minutis; involucris solitariis; glandulis involucri transverse oblongis, appendicibus
petaloideis semiorbiculatis; capsulis hirsutis; seminibus levibus opacis. Low or wet places
near San Gabriel, California; March 22. Leaves 2-3 lines in diameter. Glands black in dried
specimens, but perhaps very dark purple in the living plant. Capsule without tuberles. This
species appears to be annual, and belongs to the group that contains E. herniariodes.
135
BOTANY.
1 *'