Taraxia subacaulis is a species of evening primrose known by the common name longleaf suncup. It is native to the western United States, where it grows in several habitat types, especially in mountainous areas in moist meadows. It is a fleshy perennial herb growing from a taproot and usually lacking a stem. The leaves are lance-shaped to oval and up to 22 centimeters long and are borne on long petioles. The flower has 4 yellow petals, each up to 1.5 centimeters long, and a large, bulbous stigma tip. The fruit is a leathery capsule 1 to 3 centimeters long.
Longleaf suncup is a perennial plant without stems that grows from a thick taproot. It has a single rosette.[3] The leaves forming the rosette are more or less hairless and also somewhat fleshy in texture. They are lanceolate, shaped like the head of a spear, or narrowly elliptic, the two sides curving. The leaf edges can be smooth or irregularly lobed.[4]
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