pinus PINACEjK 791 



on each of the 3 sides, serrulate: staminate araents oval, 6 lines long, 

 with 10-15 involueral scales: anthers denticulate-crested: cones bright 

 brown, 6-18 incnes long, 3-4 inches in diameter, on peduncles 2-3 inches 

 long: seeds smooth, black, 4-6 lines long: the obtuse wing nut quite twice 

 as long: colyledons 13-15. On dry hillsides Oregon to California. 



P. monticola D. Don, Lambert lMnus 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 rivep, 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 shot t 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 tftiic* : 

 scales thin, oblong -ovate, \-\}4 inches long, slightly thickened and smooth 

 toward the apex, tipped with a small dark imibocseeds narrowed at both 

 ends, 4 lines long. Un the high mountains, California fc> Brit. Columbia. 



P. flexilis James Long's Kxped. ii, 34. \ stmt tree usually 40-8" 

 feet high with a short massive trunk 1-5 feet in diameter: with short stout 

 flexible spreading or somewhat ascending brandies and whitish <>r on old 

 trees dark brown bark : leaves stout and riyid. 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 S or 9 scale-: cones oval 

 to subcylindrical, 3-10 inches long, about \% 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 Uregon 

 to California and the Rocky Mountains. 



. P. albicaulis Kngeliu. Trans. Acad, m Louis ii. 209. A «tunt tree 



2>-b0 feet high and 1-3 teet in diameter with smooth light-.-ol.-re.! bark: 

 leaves slender, l> 2 '-3 inches long, with few row- • f stomata on the inside. 

 entire or nearly so: staminate aments short : anthers tipned with a spur: 

 cones oval to globular, lj^-3 inches long, l>£-3 inches thick, purplish- 

 brown: scales thick and some what fleshy, at length de iduous houi the 

 central axis: seeds oval, turgid, 4-0 line.-* long «>n the highest peaks ot 

 the Cascade Mountains. 



£ 2 Apophysis with a mucronate «>r blunt ] rot ii reran cu on 

 the back. Anthers terminating in a Hciuiorbicular or almost 

 orbicular crest. 



* Leaves serrulate, with sr, > niti up >n d! -il*s: s leaths persistent. 

 ■*- Leaves in threes. 



P. ponderosa Dougl. Lawson's Man. 35* A large tret- 1<»0-3»0 tWt 

 high and 2-12 feet in diameter with very thick red-brown bark, d. ep- 

 ly furrowed and split into large flakes: the branches rather close spreao- 

 ing or slightly drooping: leaves on stout branchl* ts in the axils < f strongly 

 fringed somewhat persistent bracts, 5-1 1 inches long, the thin sheaths 

 at first 9-10 lines long: staminate anthers cylindric, nVxuous, \%-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: seed- 

 dark brown, 3-4 lines long: wing 10-12 lines long, widest a ove the middle: 

 cotyledons 6-9. Common in the dry region-, California to Brit. Columbia 

 and Nebraska. 



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



