ENUMERATION OF CONIFERS 273 



brous gray branchlets; winter-buds subglobose, the terminal one with acu- 

 minate keeled and pubescent scales at base: leaves radially disposed, equally 

 4-sided, acute, dull dark green, ^i-\]/2 inches long, on young plants often 

 slightly shorter: cones cylindric-ovate, 3-4 inches long; scales with entire 

 margin. Central Asia. — Introduced to Europe about 1880 by A. Kegel. 

 Hardy as far north as Massachusetts. Similar in habit to the preceding 

 species but branchlets little pendulous on younger plants and leaves shorter. 

 A very desirable and hardy spruce. 



3. P. Watsoniana, Mast. Watson S. Narrow-pyramidal tree to 60 feet 

 tall, with slender short branches; winter-buds brown, not resinous, with 

 obtuse closely appressed scales; branchlets glabrous, yellow or yellowish- 

 gray, lustrous: leaves pointing forward, quadrangular, slender, lo-^'i inch 

 long and scarcely -^^ inch wide, straight, acuminate or acute, dark green: 

 cones cylindric-oblong, l^^-'i inches long, falling soon after maturity; scales 

 obovate, entire, rounded or slightly and abruptly produced into a short point. 

 Central and western China. — Introduced in 1901 by E. H. Wilson to Great 

 Britain. Hardy as far north as Massachusetts and growing well. Remarkable 

 for its very thin and slender leaves. 



A closely related species is P. morrisonicola, Hayata. Tree to 140 feet 

 tall, with brown scaly bark; winter-buds conic-ovoid, brown, slightly resinous; 

 branchlets dull yellow to reddish, with prominent leaf-stalks: leaves slender, 

 J^-^ inch long, acuminate: cone ovoid-oblong, 2-'-23^ inches long; scales 

 orbicular-obovate. Formosa. — Introduced by E. H. AVilson to the Arnold 

 Arboretum in 1918. Probably tender. 



4. P. WUsoni, Mast. Wilson S. Pyramidal tree to 80 feet tall, with 

 short spreading branches; branchlets glabrous, pale gray, with scarcely 

 produced petioles; winter-buds ovoid, dark brown and lustrous: leaves 

 quadrangular, stout, straight or curved, pungent, about 3^ inch long, dark 

 green: cones cylindric-oblong. l^i-2'^i inches long, persistent for about a 

 year after maturity; scales suborbicular, entire, finally recurved at margin. 

 Central China. — Introduced by E. H. Wilson to the Arnold Arboretum where 

 it has proved hardy. A handsome spruce of dense habit with short, pungent, 

 dark green leaves. 



5. P. aurantiaca, Mast. Tree to 80 feet tall, spire-like, with short hori- 

 zontal branches; bark pale gray to nearly white, exfoliating in thin plates; 

 buds conical, resinous, with obtuse scales becoming more or less revolute 

 at apex; branchlets glabrous, orange, often slightly bloomy, with prominent 

 spreading petioles: leaves quadrangular, often curved, sharply pointed, 

 1^-/4: inch long: cones cylindric, 4-5 inches long, with broad rounded, slightly 

 erose scales. Western China. — Introduced in 1908 by E. H. Wilson to the 

 Arnold Arboretum where it has proved hardy. 



A closely related species is P. retroflexa, Mast. A taller tree differing 



