ENUMERATION OF CONIFERS 305 



Hardy as far north as Canada. A low pine, tlie spreading branches densely 

 clothed with dark green leaves. It seems best adapted for planting on rocky 

 slopes. 



Var. reflexa, Engelm. (P. reflexa, Engelm. P. strobiformis, Sarg., not 

 Engelm.). Tree to 100 feet tall: leaves slender, to 4 inches long, entire or 

 remotely serrulate: cones 5-9 inches long, on longer stalks, with often thin 

 reflexed scales. Arizona.— Doubtful whether in cultivation and probably not 

 hardy north. 



5. P. Armandi, Franch. (P. scipioniformis. Mast. P. Masiersiana, Hay- 

 ata). Armand P. Tree to CO feet tall, with wide-spreading horizontal 

 branches; bark smooth, pale gray; branclilets glabrous; winter-buds cylindric, 

 chestnut-brown: leaves slender and thin, 3-6 inches long, serrulate, bright 

 green, without stomata on the back: cones pedunded, oblong-conical, 4-6 

 or sometimes 8 inches long, yellowish-brown; scales obovate, appressed, much 

 thickened in the middle, with large broadly rhombic apophysis and small 

 obtuse thickened umbo often slightly recurved; seeds pale reddish-brown, 

 ovoid, compressed. J4 inch long, with a sharp edge all around. Central and 

 western China, Formosa and Korea. — Introduced to France in 1895 and 

 a few years later to the Arnold Arboretum where it has proved perfectly 

 hardy. A handsome pine of rather loose habit with wide-spreading branches. 



Group 3. Strobi. 

 Seed with a long wing adnate to the nut. 



6. P. Ayacahuite, Ehrenb. (P. Bonapartea, Roezl. P. Don-Pedrii, Roezl. 

 P. Loudoniana, Gord.). Mexican White P. Tree to 100 feet tall, with 

 spreading slender branches; bark rough and scaly on old trees; brancldets 

 yellowish-brown, finely pubescent: leaves slender and somewhat pendulous, 

 bluish-green, 4-6 inches long: cones short-stalked, cylindric-conical, gradually 

 narrowed toward the apex, often slightly curved, brownish-yellow, 9-15 

 inches long; seeds about H int^'li long, gray-brown, mottled dark brown. 

 Northern Mexico to Guatemala.— Introduced about 1840 to Great Britain by 

 Hartweg from Guatemala and hardy only in the milder parts of Great 

 Britain, but a plant in the Arnold Arboretum, probably a hardier northern 

 form, has proved hardy in a sheltered position. 



Var. Veitchii, Shaw (P. Veitchii, Roezl). Cones to 18 inches long; 

 seed dark brown with a short and broad wing about H inch long. Central 

 Mexico. 



Var. brachyptera, Shaw. Seeds larger; wing very short. Northern Mexico. 



7. P. Lambertiana, Dougl. Sugar P. Tree to 200 or 220 feet tall, with 

 spreading somewhat pendulous branches forming a narrow open pyramid; 

 old trees usually with flat-topped, wide-spreading, open head; bark on young 



