Hoya flowers only varied as leaves, despite the fact that all five-pointed star-shaped. They also grow at flowering, usually with many flowers per umbel. Individual flowers range in size from small with a diameter of 4-5 millimeters (bilobata Hoya Schltr.) to more than three inches diameter (Hoya Imperialist macgillivrayi FM Lindl and H. Bailey.). Number of flowers per umbel varies from one (H. pauciflora Wight.) for 55 or even more. Hoya coriacea Blume been known to have as many as 70, each measuring nearly 2 cm in diameter. The single flowering Hoya pauciflora Wight makes up for shortcomings with the size of the interest that almost inches and a half in diameter.
Hoya flowers vary in texture and size, some are glabrous and shiny and some are quite hairy. They also vary in color. They come in pure white, various shades of pink from almost white to rubber-doll or bubble gum pink, yellow-pink, yellow, green, purple, brownish-red and brown. There are some so dark, so they are often referred to as black. Until recently it was thought that a true red hoya was not ever likely to occur but recent discoveries make seemingly impossible. One of the two clones mindorensis Schltr Hoya, from the Philippines, which is currently circulating., came very close to being a true red. Blue still does not appear to be represented in the genus Hoya.
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