What plant is that?

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Photo credits: © Francis R. Underwood 2018

The first mystery plant of 2018 is a fairly common one.  It has yellow flowers and grass-like basal leaves which are 6-12” long.  This plant is a perennial and has regular flowers with six petals and six sepals.  The flowers arise from the center of the plant on a long peduncle (scape) and it holds several pedicels which are much shorter.  Each of the pedicels holds a single yellow flower.This plants grows in woods roads, meadows and open woods.
It blooms from April to July.

It’s. . .