It was originally described by A. Engler in 1916 as A. costatum var. foxii.
Currently it is the most probably not recognized as a form/variety, just the species A. costatum.
Tropicos: Aglaonema costatum + foxii CATE Araceae: Aglaonema costatum The IAS: Aglaonema costatum Flickr: Aglaonema + foxii, Aglaonema costatum |