Each plant has two "parts" - the foliage and the flower. If you're looking for an Aureus Scandens, you have to make sure that the plants you're crossing have both of the necessary "parts." For example, you can't cross-pollinate just any Citrus and Fragrant plant, or you'll get an Aureus flower on whatever foliage type the plants happen to produce. To get an Aureus Scandens you have to cross, for example, a Citrus Grass and a Fragrant Reptans, or a Venemous Reptans and a Fourpetal Grass.