Fruit of C. equisetifolia
Casuarina is a
genus of 17 tree species in the family
Casuarinaceae, native to
southeast Asia, and
islands of the western
Pacific Ocean. It was once treated as the
sole genus in the family, but has been split into three genera (see:
trees growing to 35 m (115 ft) tall. The foliage consists of slender, much-branched green to grey-green twigs bearing minute
scale-leaves in whorls of 5–20. The apetalous
flowers are produced in small
inflorescences. Most species are
dioecious, but a few are
fruit is a woody, oval structure superficially resembling a
conifer cone, made up of numerous
carpels, each containing a single
seed with a small
 The generic name is derived from the
Malay word for the
cassowary, kasuari, alluding to the similarities between the bird's feathers and the plant's foliage,
 though the tree is called rhu in current standard Malay.
Casuarina species are a food source of the
moths; members of the genus
Aenetus, including A. lewinii and A. splendens, burrow horizontally into the trunk then vertically down.
Endoclita malabaricus also feeds on Casuarina. The
turnip moth is also recorded feeding on Casuarina.
ellagitannins found in the species within the genus.