Latin name: Viola hastata
Member of the Violet family (Violaceae)
The erect stems of the Halberd-Leaved Violet bear both the leaves and the flowers. The leaf is long and triangular in shape. The deeply buried rootstock is long, white, and brittle. The yellow blooms have five petals and a spur. It grows to a height of 4 to 10 inches. It is found in deciduous woods and ravines. It blooms in April and May.
The Halberd-Leaved Violet is very common in the Clinch Mountain area.
"A Field Guide to Wildflowers, Northeastern and North-central North America" by Roger Tory Peterson and Margaret McKenny
Photo taken in my yard