This belongs to the cinchona family, and produces the fruit called genipap or marmalade box.    From Wordnik.com.  [Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture] Reference

The marks on their bodies were of a different, dark juice, genipap, which was used to create the most intricate of geometrical designs; a form of decoration that tended to distract the eye from the otherwise total nakedness of the Xara females.    From Wordnik.com.  [River Of Desire]

Because I was not brought up with my people, I am not very fast or very clever at the things a Xara woman must do - the weaving of baskets, the working with bark, the grating of manioc, the drawing of designs with genipap juice - ".    From Wordnik.com.  [River Of Desire]