THE ANSWER IS AN ARUM LILY

Although it could be that your peace lily is not receiving enough water or fertilizer, the most likely cause is that the spathe is simply aging. The spathe is actually a modified leaf and, like most leaves, goes through photosynthesis. After some time, the chlorophyll within the spathe will begin to turn green.

If you do not mind the appearance you may choose to keep the plant as is. Otherwise you may cut the stalk right above the soil line to begin making room for new growth.

The scientific or taxonomic name would be Spathiphyllumspp.

in plant like tapa spathe adventitious root develop chlorophyll can act as assimilatory root.

Yes, they produce a small cream/ green spathe