Notes:
This genus was described as including one species of slender herbs found in dry forests of western Madagascar (Jovet 1941). The systematic relationships of Astiella were controvesional until the molecular systematic studies of Groeninckx (2009) showed that it generally is related to Hedyotis and Oldenlandia. In particular the endemic Madagascar species Hedyotis trichoglossa appears to be closely related to Astiella. Groeninckx et al. (2017) present a key to and descriptions of all the species.
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