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. 6, Pt. 3

BOTANY.
O. Acetosella, Hook. Flor. Bor.-Am4er. 1, p. 118, in part. Flowers large, pink; whole plant
larger than 0. Acetosella, as it grows on the shores of Lake Superior.
LIMNANTHACEE.
LIMNANTHES DOUGLASII,) 1. Br. i.n Londe. & Edinb. P1bilo,. Iag. Jtly, 1833; Bentih. or.
Trans. (2 se8.) l, p.409. Shores of San Pablo bay; April.
ANACARDIACEZE.
RHus DIVERSILOBA, Torr. & Gray, Flor. 1, p. 218. R. lobata, Hook. Flor. Bor.-Amer. 1, p.
127. Common throughout northern California; more rare in the Klamath basin. Specimens
from Fort Reading; April, in flower, July, in fruit. Berries white; called by the inhabitants
of California "poison oak." Several of our party were poisoned by it, and it also affected some
of our mules.
ACERACEE.
ACER MACROPHYLLUM, Pursh. Flor. 1, p. 267; flook. Flor. Bor.-Arner. 1, p. 112, t. 38 Null.
Sylv. 2, p. 76, t. 67. Cascade Mountains and Willamette Valley, O. T.
ACER CIRCINATUM, Pursh, Flor. 1, p. 266; Hook. Flor. Bor.-Amer. 1, p. 112, t. 39. Willamette valley, O. T.
ACER GLABRUM, Torr. A4nn. Lyc. Nat. Hi8st. N. York, 2, p. 172. Cascade mountains, O. T.
ACER TRIPARTITUM, Nutt. in Torr. & Gray, Flor. 1, p. 247. Cascade mountains, O. T.
HIPPOCASTANACE2E.
_i/SCULUS CALIFORNICA, Nutt. in Torr. & Gray, Flor. 1, p. 251, & Sylva, 2, p. 69, t. 64.
mon throughout the valleys of California. In flower July 1st.
CELASTRACEAA.
EUONYMUS OCCIDENTALIS, Nuztt. in Torr. & Gray, Flor. 1, p. 258. Coast near San Francisco;
May, in flower. Very nearly allied to E. atropurpureus; perhaps not distinct.
RHAMNACEZE.
RHIAMNUS PURSIIANUS, DC.; -Hook. Flor. Bor.-A.mer. 1, p. 123, t. 43.
FRANGULA CALIFORNICA, Gray, Gen. -Tlust. 2, p. 178, & P1. Wright. 2, p. 28. R. oleifolius,
Hook. Flor. Bor. -Amer. 1, p. 123. R. laurifolius, Nutt.; Torr. & Gray, Flor. 1, p. 263. Fort
Reading; July. Shore of Klamath lake; August, in fruit.
CEANOTHUS VELUTINUS, Dougl. in Hook. Flor. Bor.-Amer. 1, p. 125, t. 45. Common in the
Cascade mountains, O. T. The pubescence of this plant is very variable, and I have been
unable to distinguish it from C. levigatus.
CEANOTRUS THYRSIFLORUS, Esch.; Bot. Reg. 30, t. 38; Torr. & Gray, Flor. 1, p. 266; Nutt. Syiv.
2, p.43, t. 57. Very common about San Francisco.
CEANOTHUS PROSTRATUS, Benth. P1. Hartw. No. 1683. Pine woods in northern California;
grows in a mat on the ground.
CEANOTRUS CUNEATUS, Nutt.; Torr. & Gray, Flor. 1, p. 267. Near Fort Reading; July, in
fruit.
CEANOTRUS INTEGERRIMUS, Hook. & 4rn. Bot. Beech. p. 329; Benth. Pl. Hartw. No. 1684.
Near Fort Reading; July, in fruit and flower.
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