Alstonia angustifolia subsp. annamensis Monach. Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Apocynaceae genus Alstonia species Alstonia annamensis Name Homonyms Alstonia angustifolia var. annamensis Monach. Alstonia angustifolia subsp. annamensis Monach.