As near as I can discern from a little online research, the dark flowered form of Hoya stenaokei was discovered on a 2018/2019 expedition to a low land primary forest (Timika Forest) in Arso Keerom, Papua Province, West Indonesia. Below the flowers of both clones of Hoya stenaokei with Nathalie Simonsson’s 2011 discovery (NS12-222) on the left and the dark form from 2018/2019 on the right: