Plant for ID : Kenya : 30JAN21 : AK-37
1 image.
Plant with purple flowers, not sure if cultivated seen in Nairobi during July, 2016.

Acanthaceae ?? Dicliptera?

Can be Dicliptera candicans?
Just a suggestion.

Justicia ?

That may be possible.

Dicliptera candicans is not listed either in POWO or CoL.

But it is Dicliptera or related genus only and not Justicia.

Many of the plants I have posted from Nairobi are clicked at the David Sheldrick Elephant Orphanage in Nairobi.
So they may not be native ones.
I also think Dicliptera to be the closest.