Myrmeconauclea strigosa (Ant Plant)
Botanical name: Myrmeconauclea strigosa
Common name: Ant Plant
Family: Rubiaceae
Origin: Borneo
Myrmeconauclea strigosa is always found growing near the riverbank and is associated with ants. On this shrub the ants live in hollow internodal swellings near the end of the branches.
Stipules and young stems are densely hairy, the leaves simple and opposite. The whitish-yellow flowers are arranged in solitary heads terminal on unbranched flowering axes.
Link to this plant:
https://toptropicals.com/catalog/uid/myrmeconauclea_strigosa.htm