[Illustration: FIG. 525.--_Punica granatum._ Flower, long. sec.
(nat. size).]
=3.= LECYTHIDEÆ. The majority are South American. The leaves are
scattered, without pellucid glands, and frequently dentate. The flowers
are zygomorphic. The woody fruits are either indehiscent, or open by
a lid. To this belong: _Bertholletia_ (_B. excelsa_), the seeds well
known as “Brazil-nuts,” _Lecythis_ (Sapucaia-nuts from _L. ollaria_),
_Barringtonia_.
=4.= LEPTOSPERMEÆ. Almost entirely from Australia and the East
Asian and Pacific Islands. The fruit is a _capsule_. The leaves
are scattered, and in some placed edgewise by the twisting of the
leaf-stalks.--_Eucalyptus_, the Australian Gum-tree; the calyx falls
off like a lid (Figs. 526, 527). Some of the species attain gigantic
heights, _E. amygdalina_ 140–150 m. with a diameter of 8 m. The leaves
in _E. globulus_ are opposite and dorsiventral on the young plant; on
the older scattered, placed edgewise by the twisting of the leaf-stalk,
and isolateral; _Metrosideros_, _Calothamnus_ (stamens distinctly
polyadelphous), _Melaleuca_, _Leptospermum_, _Callistemon_ (the flowers
are borne in spikes whose axis continues to grow after flowering, thus
several zones of fruits may be seen on the same branch).
[Illustration: FIGS. 526, 527.--_Eucalyptus globulus._
FIG. 526.--Long. sect. of flower.