As the days lengthen and the sunlight heats up the greenhouse, a lot of our tropical plants begin to flower. This is Euphorbia splendens and as the name suggests it is a pretty spectacular plant, with a cluster of spiny stems terminated by a helical whorl of leaves and very showy clusters of "flowers". This plant grew in the miserable little excuse for a greenhouse that was at my undergraduate college, and a particularly perverse botanist (Aren't they all a bit perverse?) let a pair of us struggle all afternoon to identify the family knowing full well we were making a fundamental mental error. Yes, we kept trying to sort out the flower's parts and nothing made any sense because the key separated out plants with milky sap without regard to flowers, and this plant readily oozes latex, and if we'd paid attention it all would have made sense. The flowers in this genus and family are small and unisexual, and in plants like this a number of flowers are clustered together into an inflorescence surrounded by a pair of very showy bracts. So those aren't petals or perianth at all, and the number of flowers per cluster isn't constant, so it seems you have different numbers of pistils and stamens. But did the Phactor ever forget this lesson? No, you only get to fool me once.