i had 2 samples of this bloom for me this year, a first for both, one i had just gotten as a rooted cutting a few months ago (shown above) the other i got over a year ago as a small seedling. there are a lot of these, all star shaped flowers, but an odd mix of yellows reds and browns, and a few exceptions. most have small 2" or less flowers. this one is about 6" across. the petals will completely re-curve behind the flower if there is no obstruction, but otherwise they lay flat against or drape onto their surroundings. like a dead starfish. the buds are like little chinese lanterns, big balloon pods that eventually snap open one evening. flowers vary from yellow with reddish to reddish with some hints of yellow, and i think temperature is a factor, and light for sure. i have 3 other (2 unbloomed) stapeliads already and i don't want more really, so i was going to get a bulbo as the reward for flowering this one. i saw a cross of echinolabium with something else that is reportedly able to do well here in southern ca. 'bulbo wilbur chang' is the name. large stinky yellow flower. might be a suitable reward plant.
this is the other red one with petals curved all the way back behind the flower:
holding it up to the other variety flowering, s. gigantea is much larger, but it is hard to tell in this photo, since the red flower is closer, it looks almost the same size. the grandiflora is about 6" across, but the gigantea was about 11" on the largest flower.
gigantea with fly: