mature trees in open growth.

[Illustration: PLATE XXIV. PINUS PSEUDOSTROBUS]

38. PINUS MONTEZUMAE

1817 P. occidentalis H. B. & K. Nov. Gen. ii. 4 (not Swartz).
1832 P. Montezumae Lambert, Gen. Pin. ed. 8vo, i. 39, t. 22.
1839 P. Devoniana Lindley in Bot. Reg. xxv. Misc. 62.
1839 P. Hartwegii Lindley in Bot. Reg. xxv. Misc. 62.
1839 P. Russelliana Lindley in Bot. Reg. xxv. Misc. 63.
1839 P. macrophylla Lindley in Bot. Reg. xxv. Misc. 63.
1840 P. filifolia Lindley in Bot. Reg. xxvi. Misc. 61.
1841 P. Sinclairii Hooker & Arnott, Bot. Beechy Voy. 392, t. 93
(as to cone).
1841 P. radiata Hooker & Arnott, Bot. Beechy Voy. 443 (as to leaves).
1847 P. Grenvilleae Gordon in Jour. Hort. Soc. Lond. ii. 77, f.
1847 P. Gordoniana Hartweg in Jour. Hort. Soc. Lond. ii. 79, f.
1847 P. Wincesteriana Gordon in Jour. Hort. Soc. Lond. ii. 158, f.
1847 P. rudis Endlicher, Syn. Conif. 151.
1847 P. Ehrenbergii Endlicher, Syn. Conif. 151.
1858 P. Lindleyana Gordon, Pinet. 229.
1891 P. Donnell-Smithii Masters in Bot. Gaz. xvi. 199.

Spring-shoots uninodal, slightly or not at all pruinose. Bark-formation
early, the branches becoming dark and rough. Leaves prevalently in
fascicles of 5, but varying from 3 to 8, extremely variable in length,
attaining 45 cm. at subtropical levels; resin-ducts medial, hypoderm
sometimes uniform, more commonly multiform, the outer walls of the
endoderm thick. Conelet mucronate, the prickle often reflexed. Cones of
many sizes, attaining in warm localities 30 cm. in length, ovate-conic
or long-conic, symmetrical, often curved, deciduous and often leaving a
few scales on the tree; apophyses dull, rarely lustrous, nut-brown, or
of various shades of fuscous brown to nearly black, flat, tumid,
pyramidal or sometimes slightly protuberant, the prickle rarely
persistent.

This species ranges from the mountains of northern Durango to the
volcanoes of Guatemala, or possibly farther south. It is found at all
altitudes where Pines can grow except on the tropical levels of
Guatemala. Its more hardy forms have been successfully grown in the
milder parts of Great Britain and northern Italy. It is felled for
lumber in many parts of Mexico.

This sturdy Pine and its numberless variations present the most
remarkable example of adaptation in the genus. The variations are
mostly those associated with changes of environment--dim