f 3, 4 or 5, the sheath
deciduous, from 8 to 14 cm. long; resin-ducts medial with an occasional
internal duct. Conelets single or verticillate, their scales mucronate;
conelets of the second year only slightly enlarged. Cones maturing the
third year, not exceeding 7 cm. in length, ovate or ovate-conic,
subsymmetrical, more or less reflexed, persistent for several years on
some trees, sometimes serotinous; apophyses lighter or darker brown,
often with an olive or fuscous shade, thin or tumid, the umbo double,
the mucro more persistent near the apex of the cone.

This species grows at subtropical or warm-temperate altitudes in
Mexico, from Oaxaca through the central and western states to southern
Arizona and New Mexico. As it approaches the northern part of its
range the leaves become thicker and more rigid and the number in the
fascicle is reduced to 3 or 4 (var. chihuahuana, Shaw, Pines Mex. 14).
Like P. rigida it sprouts freely along the branches and trunk, and
stumps of felled trees put out shoots in great numbers. The species is
easily recognized by the deciduous sheath and triennial cone.

Plate XVI.

Fig. 151, Branch with fruit of first, second and third years. Fig.
152, Leaf-fascicles. Fig. 153, Magnified leaf-section of the
species. Fig. 154, Magnified leaf-section of the variety.

21. PINUS LUMHOLTZII

1894 P. Lumholtzii Robinson & Fernald in Proc. Am. Acad. xxx. 122.

Spring-shoots uninodal, sometimes multinodal. Leaves in fascicles of 3,
the sheath deciduous, from 20 to 30 cm. long, absolutely pendent;
resin-ducts medial and internal. Conelets subterminal, or lateral and
subterminal, mucronate. Cones not exceeding 7 cm. in length,
symmetrical, pendent on slender peduncles, ovate-conic, early deciduous;
apophyses sublustrous, nut-brown, tumid at the margins, flat on the
surface, the umbo large, the mucro rarely persistent.

A remarkable Pine with long pendent bright green foliage, confined to
the western states of Mexico and ranging on the mountains from
southern Jalisco to the latitude of the city of Chihuahua. Each
season's growth of leaves hangs from the branchlet like a long beard,
from which the tree receives, in some localities, the name "Pino barba
caida." In the herbarium the long leaves, deciduous sheaths, and the
decurrent bases of the bracts, present a combination of characters not
found in other species.

Plate XVI.

Fig. 155,