The inflorescences are shaped irregularly and grow to a length of up to 8 cm. They are greenish-yellow or sometimes fully green with purple or brownish stripes. The spathe, known in this plant as "the pulpit" wraps around and covers over and contain a spadix ("Jack"), covered with tiny flowers of both sexes. The flowers are unisexual and sequential hermaphrodites, in small plants most if not all the flowers are male, as plants age and grow larger the spadix produces more female flowers. This species flowers from April to June. It is pollinated by fungus gnats, which it attracts by smell and are trapped by the flower. They manage to escape from the male inflorescences, but cannot do so when they fall inside a female inflorescence. Other insects are known to visit the flowers as well, such as gall gnats and beetles.