Coreopsis maritima, the sea dahlia,[3] is a species of tickseed in the sunflower family.

It grows on mainland ocean bluffs in San Diego County and in northern Baja California, with a few isolated populations reported from just west of Malibu in Los Angeles County, Santa Cruz Island in Santa Barbara County, and Stoddard Canyon north of Rancho Cucamonga in extreme southwestern San Bernardino County.

The 12–20 mm long flower phyllaries number 12–13, sometimes more, and they are lanceolate.

[6] Plants bloom in late winter to early summer, with normally one or two flower heads per stem, on 15 to 30 cm long peduncles, but sometimes 4 or more heads can be found per stem.

Flower heads have 16-21 ray florets with laminae 20–35+ mm long.