Violet in middle spring

I found the pretty little flower was blooming beside a walk in a park.

The flower has no name in English.

In Latin, it is called Viola grypoceras.

Weeds in mother farm

Viola grypoceras.

This is the most popular violet as spring flower in Japan.

This is a jack in the pulpit.

In Japan, We can see them in forest.

This looks like a pitcher plant but in fact, it isn't.

Inner of the jack in the pulpit.

Cornflower?

Bud of acorn.

It is like a peanut.

It has red cotyledons.

To protect itself from UV?

This has yellow cotyledons.

Many nodules in ground.

And, they were exposed.

Did anyone dig here for study?

Higher concentrated nitrogen might be contained here.