Kapok is a large deciduous tree of the kapok genus in the kapok family of Malvaceae.
Hibiscus is a shrub of Hibiscus of Hibiscus family in Malvaceae.
So they are very different plants.
Another name of Hibiscus: kapok, wattle, Trumpet Flower
It can be seen here that the other names of kapok and Trumpet Flower are just the same, but the species are not the same.
Deciduous shrub, 3-4m high, branchlets densely covered with yellow stellate villi.
Flowers solitary between axils of branches, pedicels 4-14 mm long, bracteoles 6-8, linear, calyx campanulate, 14-20 mm long, lobes 5.
The colors are pure white, light pink, light purple, purple red, etc. the flower shape is bell shaped, and there are several kinds of single petals, double petals and double petals. 5-6 cm in diameter, petals obovate, 3.5-4.5 cm long, sparsely ciliated and stellate villous outside; staminal style about 3 cm long; style branches glabrous.
It enjoys light and humid climate, is cold resistant, has no strict requirements on soil, and can grow in clay.
Deciduous trees, up to 25 meters high, bark gray white.
Flowers solitary, usually red, sometimes orange red, ca. 10 cm in diameter; calyx cup-shaped, 2-3 cm long, glabrous on the outside, densely covered with yellowish short silky hairs on the inside, calyx teeth 3-5, semicircular.
Like light and warm and dry environment. It is a neutral or slightly acid sandy soil that is not cold resistant, likes deep, fertile and well drained.
