BOTANY. 
135 
specimens are all female, and mostly in fruit. The plant is of a light-brown when dry. Dr. 
Eogelmann (1. c.) was inclined to refer A. Oxycedri of Hooker’s FI. Bor.-Amer. to this species, 
but seeing that plant in my herbarium, he thought it was probably A. Americana, Nutt. 
Arceuthobium Oxycedri, M. 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 quad¬ 
rangular 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. 
SAURURACEiE. 
Anemopsis Californica, Nutt . in Tayl. Ann. Nat. Hist. 1, p. 136; Hook. & Am. Bot. Beech, 
p. 390 t. 92. Wet places on the Rio Grande, near Albuquerque ; October. 
CALLITRICHACEiE. 
Callitriche verna, Linn. Sp. 1, p. 6 ; Torr. FI. N. York , 2, p. 170, var. vulgaris, DC. 
Prodr. 3 , p. 70. In water, near Tamul Pass, Califcrnia ; April 11. Styles twice as long as 
the fruit. 
Callitriche marginata n. sp. : fructibus longepedunculatis ; carpellis parallelis dorso alato- 
membranaceis ; foliis lineari-spathulatis trinerviis. Muddy places along Mark West’s creek, 
California; April 30. Upper California; Rev. A. Fitch , (locality not recorded.) Stem slender, 
branching, rooting in the mud. Leaves about one-third of an inch long, distinctly 3-nerved. 
Styles at first spreading, hut 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 the base to the summit. A well characterized species, resembling C. Nut- 
tallii; nob. (C. pedunculosa, Nutt, in Trans. Amer. 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, Rel. Haenk. 2, p. 88, t. 64 ; Benth. PI. Harho. 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 her¬ 
maphrodite flowers which he describes. 
EUPHORBIACEiE. 
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 Euphorbia, 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’s Manal , ed. 2, p. 389,) from which, indeed, 
it is difficult to distinguish it. 
Euphorbia melanadenia (sp. nov.): caule procumbente ramosissimo lierbaceo ; foliis breviter 
petiolatis suborbiculatis inequaliter cordatis crassiusculis integeriimis dense cano-pmbescentibus; 
stipulis minutis ; involucris solitariis ; glandulis involucri transverse oblongis, appendicibus 
petaloideis semiorbiculatis ; capsulis hirsutis ; seminibus lmvibus 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 tubercles. This 
species appears to be annual, and belongs to the group that contains E. herniariodes. 
