ENUMERATION OF CONIFERS 293 



glabrous. From Labrador to Alaska, south to Pennsylvania, Indiana, Min- 

 nesota, and British Columbia. — Introduced to Europe before 1737. Hardy 

 as far north as Saskatchewan. 



A supposed hybrid between this species and L. decidua is L. pendula, 

 Salisb. (L. americana var. pendula. Loud.). Differing from L. laricina chiefly 

 in its larger cones, with 20-30 scales pubescent below the middle; from L. 

 decidua in its smaller cones with the scales glabrous above the middle and in 

 its shorter bracts. Originated in England before 1800. 



27. CEDRUS, Loud. CEDAR 



Large evergreen trees with horizontally spreading, irregularly disposed 

 branches; bark dark gray, smooth on young stems, thick and fissured on old 

 trees: leaves alternate on leading shoots or fascicled on spurs, quadrangular, 

 stiff: flowers monoecious; the staminate ones terminal on spurs, cylindric, 

 upright, about 2 inches long; female flowers ovoid, purplish, about 3^ inch 

 long, consisting of numerous suborbicular 2-ovuled scales subtended by 

 small bracts : cones ovoid to ovoid-oblong, 3-5 inches long, with broad closely 

 imbricate scales, attaining maturity the second or third year; seeds angular, 

 with large membranous wings; cotyledons 8-10. (Name derived from kedros, 

 used by the ancient Greek for resinous trees, chiefly Juniper.) — Three closely 

 related species in North Africa, Cyprus, Asia Minor, and on the Himalayas; 

 sometimes considered races of one species. 



A. Leading shoot stout, upright or nodding; branchlets only exception- 

 ally pendulous: cones truncate and often concave at apex. 

 B. Branchlets densely short-pubescent: leaves as high or higher than 



broad, usually less than 1 inch long 1. C. atlantica 



BB. Branchlets glabrous or slightly pubescent: leaves broader than 



high, usually 1-1 K inches long 2. C. libani 



AA. Leading shoot and branchlets pendulous, densely pubescent: leaves 



to 2 inches long: cones rounded at apex 3. C. Deodara 



1. C. atlantica, Manetti (C. libani var. atlantica. Hook. f.). Atlas C. 

 Large pyramidal tree to 120 feet tall, with upright leading shoots: leaves 

 mostly less than 1 inch long, usually higher than broad, rigid, pale or bluish- 

 green: cones 2-3 inches long, light brown; scales about \}/2 inches wide. 

 Atlas Mountains of Algeria. — Introduced some time before 1840. Hardy as 

 far north as New York. 



Var. glauca, Carr. Blue Atlas C. Foliage glaucous, with silvery hue; 

 a very desirable and vigorous form. This form is hardier than the type and 

 will survive in sheltered positions as far north as Massachusetts. Var. 

 argentea, Murr. Silver Atlas C, with more decidedly silvery-white foliage, 

 is scarcely different. 



