Hoya ‘Nathalie’ is a Mike Benardo hybrid Hoya where he crossed H. erythostemma with H. ‘Joy’ (Hoya erythostemma X Hoya ‘Joy’).  Hoya ‘Joy’ itself was a cross between Hoya sp. Laos and Hoya vitellina so in Hoya ‘Nathalie’ there are some interesting genetics going on.