H. halconensis is a native of the Philippines. Hoya buotii, and Hoya haloconensis look very similar to myself and any casual observer of tropical plants. However, according to botanical experts there are slight differences in the flower morphology of the two species. There are also some small differences in the leaf architecture, but until DNA analysis is done there is no way to be certain that we are dealing with two separate species
I can say anecdotally that H. halconensis seems to bloom far easier than buotii. It bloomed first at only two months of age from an old peduncle on a cutting, and has bloomed numerous times since with minimal care. This plant like buotii grows amazingly fast and is difficult to keep up with the watering and transplanting necessary for this level of aggressive growth. The flowers are stunning among the best in the Hoya world and this plant is definitely a must have with my highest recommendation.
**Update** There is also a plant with the common name of Big Leaved Halconensis (Hoya sp. NS05-032) for more on this plant go to this link: Big Leaf