SYNOPSIS OF THE FLORA OF COLORADO. 129 



mentose; nectary somewhat cup-shaped, surrounding the base of the 

 capsule and often exceeding it; style very short or none; stigmas 2-cleft, 

 brown, divaricate; leaves 6"-9" long, oblong or suborbicular, mostly 

 rounded at the apex, glaucous beneath, reticulately veined, entire, ob- 

 tuse at base or subattenuate into along and slender petiole; sterile 

 aments 2"-4 // long and very loosely flowered ; fertile aments also short, 

 3"-5" long, densely flowered, on long naked peduncles. Alpine, Hall & 

 Harbour, 521. Sangre de Oisto Pass. Brandegee. 



POPULUS TREMULOIDES, MX. Known as "Quaking Asp," and very 

 coininon at middle elevations. Hall & Harbour, 527. South Park, Coul- 

 ter. Dr. Smith. 



POPULUS BALSAMIFERA, L., var. CANDICANS, Gr. Commonly called 

 " Cotton wood." Hall & Harbour, 526; Dr. Smith. Chicago Lakes, Co ul- 

 ter. 



Var. ANGUSTIFOLIA, Watson. King's Rep., vol. 5, 327. (P. angusti- 

 foUa, James. Branches terete, glabrous; leaves ovate-lanceolate, atten- 

 uate at base, acute, glabrous, crenate-serrate. Common along the 

 Platte. Hall & Harbour, 525. Upper Arkansas, Porter. Canby. 



POPULUS ANGULATA, Ait. Very abundant along the Platte near 

 Denver, Dr. Smith. 



CONIFERJg. 



PINUS CONTORTA, Dougl. DC. Prod., 16, 2d pt., p. 381. A low tree, 

 10-30 high; bud-scales lanceolate, acute, sublacerate; sheaths short; 

 leaves in pairs, l'-2' long, numerous, rigid, erect-spreading, semi-terete 

 and deeply channeled, inucronate and subacute, scarcely roughish on 

 the inargiu ; cones 1-4, verticillate, l'-2' long, 10"-15" wide, ovoid, sub- 

 obtuse, straight or curved, persistent; scales 3"-4" wide, with a shining, 

 pyramidal, 4-sided summit, the transverse ridge acute, inucronate with 

 a deciduous, straightish or incurved spine. Newberry in Pacif. R. R. 

 Rep. Bot, vol. 6, p. 35, pi. 5. 



Var. LATIFOLIA, Eng. Mountain form, 15-25 high ; branches short 

 and few, recurved with age; foliage sparse, often profusely cone-bear- 

 ing ; allied to the eastern scrub-pine, P. inops, which it closely resem- 

 bles; known as "Red Pine." 7 Parry remarks: "It is quite abundant on 

 the crest and slopes of dry subalpine ridges, forming the principal part 

 of the forest there and extending to near the snow-line; asymmetrical 

 tree of rapid growth, with slim and tapering trunk a foot in diameter, a 

 smoothish, grayish-brown bark, detached in thin scales, and tough but 

 coarse wood, which is liable to warp, and rarely cut into boards ." 

 Mount of the Holy Cross, Coulter. Twin Lakes, Porter. 



Pmus PONDEROSA, Dougl. DC. Prod., 1. c., p. 395. Tall, with wide- 

 spreading or subpendulous branches, ascending at the ends, somewhat 

 twisted; bud-scales lanceolate-acuminate, fimbriate-ciliate on the mar- 

 gin; sheaths rather long; leaves in threes, rather long, 4 / -10 / , and f"-l" 

 broad, clustered at the ends of the stout rigid brauchlets, scabrous on 

 the margin, rather sharply mucrouate ; male aments several, fascicled 

 in heads, long-cylindrical, obtuse, straight or curved; autheriferous 

 bracts suborbicular, crenate-flentate; cones 3-4. subsessile, subpendulous, 

 straight or conic-cylindric^'-G' long, lJ'-2' wide; scales I'-IJ 7 long, 6"-9" 

 wide, the subrhombic summit elevated, radiately cracked, the trans- 

 verse ridge acute, the inucro stout, sharp and recurved ; bracts persist- 

 ent, thickened; seed oval, 3"-5" long, the wing oblong, obtuse, I 7 long. 

 A stately, symmetrical tree, reaching a height of 70 to 100 feet, with a 

 9 F c 



