Often a large tree in moist localities, forty to fifty feet high, sometimes three to six feet in diameter; used for ship-building. _Dirca palustris_ Linn. LEATHERWOOD. Very common on the eastern slopes of the Oakland hills, where its flowers make it very conspicuous in spring; two to four feet high. _Croton (Hendecandra) procumbens_ Hook and Arn. A very low shrub, common on the peninsula of San Francisco, in almost pure sandy soil. _Garrya elliptica_ Lindl. Mostly a shrub with slender branches, but sometimes a small-sized tree; evergreen, gregarious, in sandy soil in this city, and on the eastern slope of the Oakland hills. _Platanus racemosa_ Nutt. SYCAMORE. Banks of San Leandro Creek, Oakland hills. _Alnus viridis_ D. C. A large tree on the banks of creeks, Oakland hills. _Myrica Californica_ Cham. and Schl. WAX MYRTLE. Mostly a medium sized tree, in moist localities and on the eastern slopes of Oakland hills. _Juglans rupestris_ Engelm. Var. _major_ Torr. WALNUT. A beautiful large tree, forty to sixty feet high and two to four feet in diameter, with rather smooth bark and dense, graceful foliage; it may well vie with its Eastern congeners. Banks of Walnut Creek east of the Oakland hills. _Castanea chrysophylla_ Dougl. CALIFORNIA CHINQUAPIN. A low, straggling evergreen and gregarious shrub, occurring only on the outcroppings of the white sandstone in the Oakland hills. _Quercus densiflora_ Hook and Arn. Tamal Pais and Redwoods of Marin County. _Quercus agrifolia_ Nées. LIVE OAK. A shrub as well as a large tree; everywhere in moderately moist situations. _Quercus tinctoria var. Californica_ Torr. BLACK OAK. Hill sides, Marin County. _Quercus lobata_ Nées. WHITE OAK. Hill sides Marin County and banks of Walnut Creek. _Quercus acutidens?_ Torr. SCRUB OAK. Evergreen; forming dense chaparral on Tamal Pais. _Corylus rostrata_ Ait. BEAKED HAZELNUT. Very common on the eastern slopes of the Oakland Hills. A shrub four to six feet high. _Salix_ (four species.) WILLOW. Wet grounds everywhere, six to twenty feet high. _Populus tremuloides_ Michx. ASPEN. A medium sized tree on the banks of Walnut Creek. _Torreya Californica_ Torr. CALIFORNIA NUTMEG TREE. A large tree with long spreading branches, and rather smooth bark. Wood valuable; rare, on banks of Papermill Creek, Marin County. _Sequoia sempervirens_ Endl. REDWOOD. A very large tree, forming small groves on the northern slopes of hills in Marin County, and on the eastern slopes of the Oakland hills. _Pinus insignis_ Dougl. A small tree ten to fifteen feet high, on the outcroppings of white sandstone in the Oakland hills, third ridge eastward; rare. _Pinus contorta_ Dougl.