group of yellow trillium, trillium luteum

america american appalachain appalachia appalachian beauty bloom blooming blue botanical botany close closeup detail ecology flower flowered forest green harbison lanceolate large leaf leaves liliaceae lily luteum mountain mountains mountian mountians natural nature outdoors park parkway petal petals plant protected purity purple rare ridge spring springtime states summer trillium united usa virginia white wild wildflower wildflowers wood woodland woods