Fig. 271.—Portion of a branch of Thuja orientalis (magnified). The leaf at the base on the right has a branch in its axil.
Fig. 272.—Seedling of Thuja occidentalis. The branch (g) is borne in the axil of the leaf s.
Juniperus (Juniper). Diœcious. The cone-scales become fleshy and fuse together to form most frequently a 1–3 seeded “berry-cone.” J. communis (Common Juniper) has acicular leaves, borne in whorls of three, and the “berry-cone” is formed by a trimerous whorl of cone-scales (Fig. [273]). J. sabina and J. virginiana have “berry-cones” formed from several dimerous whorls of cone-scales; the leaves are connate and opposite, needle-and scale-like leaves are found on the same plant.
Cupressus (Cypress). Monœcious. The cones are spherical; the cone-scales shield-like, generally five-cornered and woody (Fig. [270]), each having many seeds. The leaves are scale-like.—Thuja. Monœcious. Cones oblong. The cone-scales are dry, as in the Cypress, but leathery and imbricate, and not shield-like; each cone-scale bears 2–3 seeds. The leaves are most frequently dimorphic; those leaves which are situated on the edges of the flat branches are compressed, and only these bear buds, which are developed with great regularity, generally alternately, on both sides of the branch; those which are situated on the flattened surfaces are pressed flat and broad, and never bear branches (Fig. [271]). Along the central line of each leaf there is a resin-canal (Fig. [271]).—Chamæcyparis, Callitris, Libocedrus, Thujopsis (1 species: T. dolabrata; in Japan).
Fig. 273.—Branch of Juniper with “berry-cones.”
Fig. 274.—Cupressus lawsoniana. Longitudinal section through female cone. Two ovules (ov) are bisected; f ovuliferous scales.