Hymenodictyon

Hymenodictyon excelsum:

Hymenodictyon excelsum (Roxb.) Wall., Rubiaceae: See Hymenodictyon orixense (Roxb.) Mabb.

Hymenodictyon orixense

Hymenodictyon orixense (Roxb.) Mabb.
Bot. syn.: Cinchona excelsa Roxb., Hymenodictyon excelsum (Roxb.) Wall.

I have no articles for this botanical term, but there might be some for the next level down (if found).