What is the most likely explanation for the dark area in the image below? 
Definitions:
Stamens and Carpels
Stamens are the male reproductive parts, and carpels are the female reproductive parts of a flower, both crucial for the plant's reproductive process.
Petals
The often brightly colored parts of a flower, typically serving to attract pollinators such as insects or birds.
Plumule
The part of a seed embryo that develops into the shoot bearing the first true leaves of a plant.
Monocot
A group of flowering plants that have a single embryonic leaf, or cotyledon, in their seeds.
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