258 BOTANY. 



3-4.V long, Bqnairose by the more or Less protruding tlim-edged scales, tlio 

 free pari of which is rounded or more or less triangular, rarely reflexed; 



seeds 5 or G" long, somewhat angled, with a narrow deciduous wing-rim: 

 cot} ledons G-7. 



Var.a. serrulata. — Leaves slender, slightly and distantly serrulate, and 

 as in the two following varieties, with few or scarcely any stomata on the 

 back; cones of the ordinary form. 



Yar. ft. macrocakpa. — Leaves slender, entire; cones cylindric, G-8' 

 long, 2.V in diameter, the apophysis of the scales short, rounded. 



Yar. y. reflexa. — Leaves as in last; cones ovate-cylindrical, about 1 

 long; apophysis elongated, reflexed. 



A middle-sized tree, rarely more than 50 feet high, on the higher 

 mountains of Colorado, New Mexico, and Arizona, extending to Southern 

 California. Var. a was found by Dr. Rothrock on Mount Graham (783) ; 

 var. y, by the same, on Santa Rita Mountain (east of Tucson) and in the 

 Sanoita Valley (Gf>4 and 1001). The cone of 1001 resembles that of the 

 Asiatic P. Koraiensis, or of a small P. Ayacakuite from Mexico. Var. ft was 

 collected on the San Francisco Mountains by Mr. Ferdinand Bischoff in 

 1871. — The species is intermediate between the true Strobi and Cembra; of 

 the former it has the peripheral resin-ducts, usually 2, on the dorsal side; 

 with the latter it has the large, almost wingless seeds in common; from 

 both it is distinguished by the back of the leaf being marked by a single, 

 or a few series of stomata. It thus becomes the type of a third section of 

 the Strobus-Wka Pines, which may be arranged as follows: 



1. Cembra^ with large, almost wingless seeds; dorsal face of leaves with- 

 out stomata; resin-ducts of the serrulate leaves imbedded in the parenchyma; 

 P. Cembra of Europe and Asia with appressed, and P. Koraiensis of Northeast- 

 ern Asia with squarrose cone-scales. 2. Flexilcs, with similar seeds, but entire 

 or nearly entire leaves, with a few series of stomata on back, with peripheral 

 ducts; P. fli'.r'dis, P. albican!/*, and the Asiatic P. pygmeea. This last is thus 

 entirely distinct from P. Cembra, as a variety of which it has long been 

 considered by Parlatoro and other botanists, while P. Mandschurica, at leas t 



the aoienls and the terminal bud. When, iu the following season, the axis elongates, while the anient 

 matnres to a cone, litis latter naturally Ih comes quite lateral, but we continue to designate it as Btib- 

 teruiinal, iu relation to its own, ooetaneona, part of the axis. 



