This species, once called D. radiata, is considered to be synonymous with D. foetida, which is highly unlikely. Unlike D. foetida, D. mannii has long, wand-like stems that are olive green in color and quite brittle. The hypanthium has a relatively small fertile area in the receptacle with very long bracts, making for a rather star-shaped arrangement. These plants are rooted cuttings in 4-inch pots.