Kratom flowers and foliage<unk>  is an evergreen tree in the genus<unk>  that can grow to a height of . Its trunk may grow to a diameter. The trunk is generally straight, and the outer bark is smooth and grey. The leaves are dark green and glossy and can grow to over long and wide when fully open, are ovate-acuminate in shape, and opposite in growth pattern, with 12–17 pairs of veins. The flowers, which are deep yellow, grow in clusters of three at the ends of the branches. The calyx-tube is long and has five lobes; the corolla-tube is long.<unk>  is indigenous to Thailand, Indonesia, Malaysia, Myanmar, and Papua New Guinea. It was first formally described by the Dutch colonial botanist Pieter Korthals in 1839, who named it Stephegyne<unk> ; it was renamed and reclassified several times before George Darby Haviland provided the final name and classification in 1859.
Mitragyna speciosa
Craniopagus parasiticus
Piedraia hortae
Cedecea davisae
Ephedra distachya
Arcanum joviale
Gongylonema pulchrum
Cerbera odollam