290 THE CULTIVATED EVERGREENS 



EE. Scales of cone slightly incurved at apex, longitudinally 

 convex; bracts about J^ as long as scale: leaves up to 



2 inches long 5. L. sihirica 



DD. Cone-scales glabrous, striate, lustrous. 



E. Branchlets usually pubescent : leaves exceeding IJ^ inches 



in length: cone with 20-40 scales 6. L. dahurica 



EE. Branchlets glabrous, brown: leaves Ij^ inches long or 



less: cone with 12-15 scales 7. L. laricina 



1. L. Potanini, Batal. (L. chinensis, Beiss. L. thibetica, Franch.). China 

 L. Tree to 100 feet tall, with rather short horizontal branches and gray or 

 grayish-brown bark; branchlets pendulous, glabrous, lustrous, orange-brown 

 to reddish-brown, the winter-buds of the same color but darker: leaves linear, 

 slender, acute, ^-13^ inches long, grayish-green, with bands of stomata on 

 both sides each consisting of 1 or 2 rows: cones ovoid-oblong, 1/^-1/^ inches 

 long, at maturity violet-purple changing to grayish-brown; scales sub- 

 orbicular, with rounded, entire, slightly incurved margin; bracts long- 

 acuminate, exceeding the scales, upright, purple. Western China. — Intro- 

 duced by E. H. Wilson to Great Britain in 1904 and in 1908 to the Arnold 

 Arboretum where it has proved hardy, but is not thriving. 



A closely related species is L. Mastersiana, Rehd. & Wils. Tree to 60 feet 

 tall; branchlets pale yellowish-brown, slightly pubescent when young: 

 leaves compressed: cone brown, with long-acuminate purple bracts exceeding 

 the scales and reflexed. Western China. — Introduced in 1908 by E. H. Wilson 

 to the Arnold Arboretum, but the young plant did not do well. 



Another related species is L. Lyallii, Pari. Lyall L. Tree to 80 feet tall, 

 with remote long branches; branchlets stout, brown-tomentose : leaves 4- 

 angled, rigid, acute, 1-13^ inches long: cones 13^-2 inches long, with pubes- 

 cent scales spreading at maturity and finally reflexed; bracts long-acuminate, 

 exserted, upright. High mountains of British Columbia and Alberta to 

 Washington and Montana.^Introduced several times into cultivation but 

 it never succeeded. 



2. L. occidentalis, Nutt. Western L. Tall tree to 150 feet high, with 

 dark-colored bark, becoming bright cinnamon-red on older trunks, and with 

 short horizontal branches, forming a narrow pyramidal head; branclilets 

 orange-brown, pubescent when young, soon glabrous; winter-buds dark 

 chestnut-brown: leaves rigid, sharply pointed, triangular, keeled beneath, 

 1-1^ inches long, pale green: cone oblong, 1-1}^ inches long; scales orbicular, 

 almost entire, tomentose beneath. British Columbia to Montana and 

 Oregon. — Introduced in 1881 through the Arnold Arboretum to the eastern 

 States and Europe. Hardy as far north as Massachusetts and perhaps farther 

 north. 



A related species is L. Griffithiana, Carr. (L. Griffithii, Hook. f. & Thorns.). 

 Tree to 60 feet tall, with pendulous branches; branchlets dull reddish-brown: 



