Schiedea verticillata, known as the Devils Slide schiedea[2] or Nihoa carnation, is an endangered species of plant in the family Caryophyllaceae, endemic to the island of Nihoa in the Northwestern Hawaiian Islands, where it was discovered in 1923 by the Tanager Expedition.

The flowers are petal-less, have ten stamens and 4-5 styles.

The plant estivates, dying back to the fleshy perennial roots during the dry season.

Less than 400 individual plants survive in two of Nihoa's rocky valleys, but the population has remained stable.

Even though there are very few individuals surviving, the carnation can avoid inbreeding, a problem that threatens fellow Nihoan plant Amaranthus brownii, because this carnation has the highest genetic diversity of its genus.