ne and cone-scale of var. Veitchii. Fig. 104, Cone and
seed of var. brachyptera. Fig. 105, Cone-scale of the typical form.
Figs. 106, 107, Leaf-fascicles and magnified leaf-sections.

7. PINUS LAMBERTIANA

1827 P. Lambertiana Douglas in Trans. Linn. Soc. xv. 497.

Spring-shoots pubescent. Leaves from 7 to 10 cm. long, serrulate;
stomata dorsal and ventral; resin-ducts external or with one or two
ventral medial ducts. Cones from 30 to 50 cm. long, pendent,
subcylindrical, tapering to a rounded apex; apophyses pale nut-brown,
thick, a narrow border of the under surface showing on the closed cone,
the margin rounded or tapering to a blunt slightly reflexed tip; seed
with a large nut and a broad short opaque wing.

The Sugar Pine is the tallest of the genus and attains a height of 50
or 60 metres. It grows on mountain slopes and the sides of ravines.
Its southern limit is in Lower California on the plateau of San Pedro
Martir, its northern limit is in western Oregon. The wood is valuable,
its nuts are eaten by native Indians, and the sweet exudation, which
gives the tree its popular name, is a manna-like substance of some
officinal value. P. Lambertiana is recognized by its long cone and by
the constant dorsal stomata of its leaves.

Plate X. (leaves and cone much reduced).

Fig. 100, Cone and seed. Fig. 101, Conelet. Fig. 102, Leaf-fascicle
and magnified leaf-section.

[Illustration: PLATE X. P. LAMBERTIANA (100-102), AYACAHUITE (103-107)]

8. PINUS PARVIFLORA

1784 P. cembra Thunberg, Fl. Jap. 274. (not Linnaeus).
1842 P. parviflora Siebold and Zuccarini, Fl. Jap. ii. 27, t. 115.
1890 P. pentaphylla Mayr, Mon. Abiet. Jap. 78, 94, t. 6.
1908 P. morrisonicola Hayata in Gard. Chron. ser. 3, xliii. 194.
1908 P. formosana Hayata in Jour. Linn. Soc. xxxviii. 297, t. 22.

Spring-shoots pubescent or glabrous; branches becoming studded with
prominent resin-cells of the cortex. Leaves from 3 to 8 cm. long,
slender, serrulate; stomata ventral only; resin-ducts external and
dorsal. Cones subsessile, often persistent, from 5 to 10 cm. long,
patulous or horizontal, short-ovate, or elongate and slightly conical;
apophyses nut-brown, abruptly convex near the apex, or irregularly
warped, varying much in size, the umbo confluent with the thin margin of
the scale and resting on the apophysis beneath; seeds with a large nut
and a short broad wing, often temporarily ad