Pisonia
costata
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These are trees, erect or climbing shrubs or herbs. The leaves are opposite, alternate or are arranged in whorls, simple, and entire, without stipules. The Flowers are hermaphrodite or unisexual, generally in condensed cymose inflorescences. There is often presence of sepaloid bracts, which are often coloured and subtending the flowers. Perianth is uniseriate, often resembling a corolla, the inferior part persisting on the fruit.
The lamina is 3-5 lobed or 3-5 dentate. There are 2-10 or more stamens, whereby the filaments are free or fused at the base, often unequal. The anthers have two pollen sacs opening by longitudinal splitting. Ovary is superior, unilocular with a single basal ovule. The anthocarp is indehiscent, and is formed by the fruit and perianth or the base of perianth.
Pisonia
They are trees or dioecious shrubs, rarely with bisexual flowers, and are sometimes spiny. Leaves are opposite, alternate or in verticils, and are petiolated. The flowers are small, numerous, greenish, in corymbs or in dense or loose panicles. Male flowers have infundibuliform perianth, with small erect lobes, in the form of a crown. The stamens are variable in number, in general 5-10.
Female flowers with perianth,
have larger lobes, are narrower, sometimes more fleshy. The ovary is sessile.
The anthocarp is pentagonal or 5-ribbed, with or without glandular hairs.
The perianth tube is elongated and hardened, with crown of extended or
non- extended lobes.