208 TRANS. OF THE ACAD. OF SCIENCE. 



Fi^. 3, 4. Fascicles of leaves, 2 m?gn. Fig. 3, young ones with their 

 bract; Fig. 4, full grown ones with the sheathing scales recurved. 



Fitf. 5. Upper part of leaf of the fruit-bearing branch, 10 magn. ; up- 

 per or inner side (section at base not correctly drawn). 



Fig. 6, 7, 8. Sections of leaves dry and the same soaked, 10 magn.; 

 f. 6, section of Fig. 2 ; f. 7, of another leaf ; f. 8, of a leaf of the male 

 branch. 



Fig. 9. Bunch of male aments with their perula? and bracts ; the ob- 

 tuse involucral bracts visible between the others ; 2 magn. a. An anther 

 from above, 10 magn. ; depauperate crista visible at the end of the com- 

 missure, b. Pollen, 100 magn. 



Another 5-leaved species of the Rocky Mountains, first 

 noticed more than 40 years ago, but hitherto very imper- 

 fectly known, is 



Pintts flexilis, James, in Long's Exped. 2, p. 27 & 34; 

 Torrey, in Ann. Lye. A 7 ". Y. 2, p. 249: arbor mediocris 

 seuelatior; foliis dense confertis quinis sub-biuncialibue ri- 

 gidis integris acutiusculis ex axillis perularura lanceolatarum 

 deciduarum, squamis vaginantibus obtusis laxjs mux evanidis; 

 amentis masculis ovatis involucro sub-8-phyllo munitis in 

 axillis bractese lanceolatse patulse decidme sessilibus, anthera- 

 rum crista minore irregulariter ineiso-dentnta; amentis feini- 

 neis suverticillatis in pedunculo brevi perulis late lnnceolatis 

 acutis dense stipato erectis sqnarrosis; strobilis ovato-cylin- 

 draceis sqnarrosis horizontalibus sen deciinatis e rubello fuscis, 

 squamis e basi breviter euneata latissimis orbiculato-rbombeis, 

 apophysi convexa semicirculari incrassata margine area parva 

 snbrhombea inermi notata; seminibus magnis obovatis ex- 

 alatis carinatis. 



On the Rocky Mountains, from New Mexico to the 49th 

 parallel, " occupying the subalpine belt, never forming entire 

 forests, in the lower elevation associated with P. contorta, 

 approaching the alpine districts, scattering with P. aristata" 

 (Parry's Notes) ; on the Sandia Mountains, New Mexico, 

 12,000 feet high, to the top, Dr. Bigelow ; mountains of Santa 

 Fe, A.Feneller (No. 832) ; Colorado, James, Parry, Hall & 

 Harbour (No. 529); Laramie Mountains, II. Engelmo/nn : 

 mountains from the Platte to the Bear River, Nuttall ; Wind 

 River Mountains, Fremont / Big Horn Mountains and moun- 

 tains at the headwaters of Snake River, Dr. IIay<J< a, to the 

 British boundary, Dr. Lyall. Nuttalfs figure in his Sylva, 

 pi. 112, is very poor, and even quite incorrect; nor can 

 I learn that any specimen of his is preserved in the herba- 

 rium of Mr. Durand or of the Academy of Natural Science, 

 in Philadelphia, but suppose that he had our species in 

 view. — ■ P. flexiliS) the .American representative oi P. Cem- 

 bra of the old world, is a middle-sized tree, usually 30-50 

 feet high, though Fendler, a good authority, saw it near 

 Santa Fe 00-80 feet high; Dr. Bigelow's trees, of the height 

 of 100-130 feet, on the San Francisco Mountain (Bot. Whip- 

 ple, }>. 20), must belong to some other 5-leaved species. 



