s from 5 to 7 cm. long on pliant peduncles, ovate or
ovate-conic, oblique or sometimes symmetrical, deciduous, or persistent
with a weak hold on the branch; apophyses nut-brown, flat or tumid,
often protuberant on the posterior face of the cone, the umbo usually
large and salient, forming a rounded button-like projection, on which
the mucro is wanting.

A subtropical species of central and western Mexico, growing alone or
associated with P. oocarpa, P. Pringlei and the subtropical forms of
P. Montezumae and P. pseudostrobus. It is recognized among its
associate species by its conspicuously glaucous foliage. The cone is
very variable on trees of the same grove, both in size and in the
protuberance of its apophyses. Gordon's specimen in the Kew herbarium
consists of a single detached cone and a few leaves. The leaves differ
from all that I have examined in showing thick-walled endoderm cells,
but the cone corresponds with many of my own collection.

Plate XXVII.

Fig. 239, Three cones. Fig. 240, Leaf-fascicle and magnified
leaf-section. Fig. 241, Magnified cells of the leaf-endoderm.

[Illustration: PLATE XXVII. P. TEOCOTE (235-238), LAWSONII (239-241)]

42. PINUS OCCIDENTALIS

1788 P. occidentalis Swartz, Nov. Gen. & Sp. Pl. 103.
1862 P. cubensis Grisebach in Mem. Am. Acad. ser. 2, viii. 530.
1880 P. Wrightii Engelmann in Trans. Acad. Sci. St. Louis, iv. 185.

Spring-shoots uninodal, pruinose. Leaves in fascicles of 2 to 5, from 15
to 22 cm. long; resin-ducts internal, hypoderm biform, endoderm with
thin outer walls. Conelets erect, aristate. Cones from 5 to 8 cm. long,
reflexed, ovate, symmetrical, deciduous; apophyses nut-brown, lustrous,
flat or tumid, the umbo often thin and, together with the slender
prickle, bent sharply downward.

This species is confined to San Domingo, Hayti and eastern Cuba. Its
erect conelet and reflexed cone distinguish it from P. caribaea, which
has both its conelet and cone reflexed. Moreover the conelet is
usually, perhaps always, subterminal in P. occidentalis.

Plate XXVIII.

Fig. 247, Cone. Fig. 248, Conelet and enlarged aristate scales. Fig.
249, Magnified sections of two leaves and more magnified dermal
tissues.

43. PINUS PALUSTRIS

1768 P. palustris Miller, Gard. Dict. ed. 8.
1810 P. australis Michaux f. Hist. Arbr. Am. i. 64, t. 6.

Spring-shoots uninodal, rarely multinodal. Buds peculiarl