- PINUS PINACEA 791 
on each of the 3 sides, serrulate: staminate aments oval, 6 lines long, 
with 10-15 involucral scales: anthers denticulate-crested: cones bright 
brown,6-18 inches long, 3-4 inches in diameter, on peduncles 2-3 inches 
long: seeds smooth, black, 4-6 lines long: the obtuse wing not quite twice 
as long: colyledons 13-15. On dry hillsides Oregon to California. 
P. monticola D. Don, Lambert Pinus 111. A slender tree 100-200 
feet high and 1-6 feet in diameter and rather slender spreading or some- 
what drooping branches: bark of young trees light gray, on fully grown 
tiees divided into nearly square plates covered by small closely appressed 
purple scales: leaves in fives, blue-green and glaucous, 144-4 inches long, 
with brown or white soon deciduous sheaths: staminate flowers oval, 4-5 
lines long, the stamens terminating in short crests or knobs, surounded by 8 
bracts: pistillate flowers oblong-cylindric, with thin scales raised upon 
stout peduncles: cones 4-11 inches long, pendulous, 1-2 inches thick: 
scales thin, oblong-ovate,1-14¢ inches long, slightly thickened and smooth 
toward the apex, tipped with a small dark umbo: seeds narrowed-at both 
ends, 4 lines long. On the high mountains, California to Brit. Columbia. 
P. flexilis James Long’s Exped. ii, 34. A stout tree usually 40-80 
feet high with a short massive trunk 1-5 feet in diameter: with short stout 
flexible spreading or somewhat ascending branches and whitish or on old 
trees dark brown bark: leaves stout and rigid, sharp-pointed with callous 
tips, dark green, about 2 inches long, with light brown or white soon de- 
ciduous sheaths: staminate flowers oval, about 6 lines long, the reddish 
anthers tipped with short crests, surrounded by 8 or 9: scales: cones oval 
to subcylindrical, 3-10 inches long, about 11 inch thick: scales rounded 
at the broad or somewhat narrowed apex, tipped with a dark thickened 
umbo: seeds oval, 4-6 lines long. On the high mountains, eastern Oregon 
to California and the Rocky Mountains. 
P. albicaulis Engelm. Trans. Acad. St. Louis ii, 209. <A stout tree 
20-60 feet high and 1-3 feet in diameter with smooth light-colored bark: 
leaves slender, 144-3 inches long, with few rows of stomata on the inside, 
entire or nearly so: staminate aments short: anthers tipped with a spur: 
cones oval to globular, 144-3 inehes long, 144-3 inches thick, purplish- 
brown: scales thick and somemhat fleshy, at length deciduous from the 
central axis: seeds oval, turgid, 4-6 lines long. On the highest peaks of 
the Cascade Mountains. 
§ 2 Apophysis with a mucronate or blunt protuberance on 
the back. Anthers terminating in a semiorbicular or almost 
orbicular crest. 
* Leaves serrulate, with stomata upon all sides: sheaths persistent. 
+ Leaves in threes. 
_ P. ponderosa Dougl. Lawson’s Man. 354. A large tree 100-300 feet 
high and 2-12 feet in diameter with very thick red-brown bark, deep- 
_ ly furrowed and split into large flakes: the branches rather close spread- 
ing or slightly drooping: leaves on stout branchlets in the axils of strongly 
fringed somewhat persistent bracts, 5-11 inches long, the thin sheaths 
at first 9-10 lines long: staminate anthers cylindric, flexuous, 144-2 inches 
long: involucre of 10-12 scales: anthers with a large semicircular scarcely 
dentate crest: cones oval, 3-5 inches in diameter often 3-5 together, 
sessile or nearly so, of a rich brown color: scales thick at the apex: umbo 
high, with a short stout triangular straight or incurved prickle: seeds 
q dark brown, 3-4 lines long: wing 10-12 lines long, widest above the middle: 
- cotyledons 6-9. Common in the dry regions, California to Brit. Columbia 
and Nebraska. 
4 
| 
P. Jefferyi Oregon Com. A rather slender tree 100-200 feet high and 
