Bupleurum rotundifolium, the round-leaved hare's ear, also known as field hare's ear, growing-through hare's ear or growing-through hare's ear, is an umbellifer native to the Chinese provinces of Hebei, Liaoning, Jilin, Heilongjiang, Henan and Shaanxi and rarely to very rarely found in Central Europe.
The annual herbaceous plant grows to a height of about 15 to 50 cm. The umbels are usually 5 to 7-rayed and have no sheath. The usually 5 to 6 bracts are roundish-ovate, yellow-green and pointed. They are two to three times as long as the umbels. The corolla is golden yellow.