Hoya anncajanoae is endemic to to Luzon Island in the Philippines and was named after its discoverer,
Ann O. Cajano, a technician at the Botanical Herbarium and Museum of Natural History,
UPLB College, Leguna. It was published by Dale Kloppenburg and Simeona V. Siar in 2008.
It is in the Acanthostemma Section of Hoyas and has pretty large flowers for that section.