sentences:  These plants are very closely related to "Psychotria" and in particular its subgenus "Heteropsychotria".Indeed, it seems to be nothing else but a distinctively-flowered offshoot of "Heteropsychotria"; arguably, it would thus need to be merged into "Psychotria" to make that genus monophyletic.But on the other hand, "Psychotria" is extremely diverse already, so it is probably more practical to move the more distantly related species out of this genus and merge "Heteropsychotria" with "Palicourea".