PtNACE^fc ?9l 



on each of the 3 sides, serrulate: staminate amenta 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, 1)^-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, 1-1M inches long, slightly thickened and smooth 

 toward the apex, tipped with a small dark iimbo : 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 1} 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, 1)^-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, l>-3 inches long, l>-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 Dpugl. 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, 1)^-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 

 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. 



P. Jefferyi Oregon Com. A rather slender tree 100-200 feet high and 



