CATALOGUE. 257 
Pseupotsuca* Dovexasu, Carritre; Abies Douglasii, Lindl.—Often 
one of the tallest trees known (in favorable localities, in Oregon, even 
300-350 feet high), with very thick, much cracked, brown bark, spread- 
ing branches, conspicuous, somewhat persistent bud-scales, slender, flat, 
linear, obtuse or acutish leaves, }-14, rarely 14 inches long; cones ovate- 
oblong, usually 2-3 long, brown, well marked by ‘the protruding, long- 
cuspidate bracts; scales orbicular, concave; oval wings about as long as 
the somewhat triangular, pale seeds; cotyledons 6-8. 
Common through Arizona, as it is through all the western mountain 
regions, down into Mexico.—Leaves stomatose and whitish only on 
the lower surface, with 2 resin-ducts close to the epidermis of the under 
side. . 
Pinus} FLEXILIS, James; Parlat. in DC. Prod. 16, 2, 403.—A middle- 
sized tree, with a smoothish, or, in old trees, lightly furrowed, pale or ash-gray 
bark; leaves in fives, mostly entire and smooth-edged, 14-2’ long, in a loose, 
deciduous sheath, about 4’ in length; involucre of the oval staminate flowers 
composed of 8—9 oval, obtuse scales; anthers with a short lacerate or toothed 
crest; cones sub-terminal,} spreading, or slightly reflexed, ovate-cylindrical, 
PsEubotTsuGa, Carr. Conif. ed. 2, 256; Abies, sect. Tsuga (in part), End].—Coniferous trees, with 
flattened, entire, somewhat 2-ranked, distinetly petioled leaves, leaving on the branchlets scarcely 
prominent, transversely oval scars; flowering from the axils of the leaves of the previous year; staminate 
flowers resembling an oval or suboyiindsieal ament; anthers with a recurved, —— point; cells 
cpening Per argsne pollen oval-subglobose; sessile cones subpendulous, maturing in one season; 
scales and their much elongated bracts persistent on their axis; seeds without ‘oheces veda, not 
separating m8 bi wing.—Very large trees, with very thick bark and reddish or yellowish wood, of 
secondary value, which is characterized and well distinguished from the wood of all the allied genera, 
and of most coniferous woods, by the abundance of spiral vessels, otherwise so rare in this family. The 
difference in the pollen, the seeds, and the leaf structure make a separation of this genus from Abies as 
well as — a paaenen 
tTot of the genus Pinus may be added: Staminate flowers surrounded by an involu- 
crum, of a somewhat definite number of scales (3-15 or 20), the lowest, lateral, pair of which are strongly 
keeled; pollen-grains lobed, similar to that of Abies and Picea, wes only half as eo 0. — ee — 
The bchete of the cones, which, in the allied genera, , become here mu 
and corky, and, together with the scale below them, form a sort of cell for the reception of the seeds. The 
- base of the wing only partially covers tbe upper side of the seed, and usually forms a mere rim around the 
seed, which easily separates from it; in a few species, the wing is firmly attached to the seed, and ina 
few others it is reduced to a narrow margin; the seed never shows balsam-vesicles. 
t The fertile aments of Pinus, and consequently the cones, are usually called bbinal, but they 
never are that, but always lateral, and either appear between the uppermost leaves and the terminal 
bud, when they may be called sub-terminal (P. resinosa, Strobus, sylvestris), or the axis continues to 
elongate after the formation of the aments, when these and consequently the cones become lateral, the 
axis bearing leaves and sometimes other aments above them (P. Tada, and especially inops, and in 
Europe, P. Halepensis). In some — both forms occur, or only a few leaf-bundles intervene between 
17 BoT 
