Tripolium pannonicum (Jacq.) Dobrocz., commonly known as sea aster, is a halophytic perennial species within the Asteraceae family. It is distributed across coastal and saline habitats in Europe and parts of Asia, where it occupies salt marshes, estuaries, and brackish meadows. This species demonstrates a high tolerance for salinity and periodic inundation, adapting to challenging environmental conditions.

The plant features lanceolate to linear leaves and produces capitula with pale violet to lilac ray florets and yellow disc florets, flowering from late summer to autumn. T. pannonicum plays a key ecological role in stabilizing saline soils and providing habitat resources for invertebrates. It is of interest in studies on salinity tolerance and coastal biodiversity.