If you remember, when I originally flowered Hoya stoneana last year I announced it as Hoya siamica, because this was the name that I bought it under.  Well it is not, and never was siamica, but a plant that used to be known as the pubescent form of H. longifolia.  I love this plant, and it falls into the category of Hoyas that flower with the lengthening days of late spring.  It also loves cooler temps than most Hoyas.