Delissea rhytidosperma, commonly known as Kauai delissea or Kauai leechleaf delissea, is a rare, perennial herbaceous shrub endemic to the mesic forests and cliff sides of Kauai, Hawaii. It is part of the Hawaiian lobelioids, a group of plants that are mostly found in the Hawaiian Islands. Delissea rhytidosperma can grow up to 8.2 feet tall and features lance-shaped or nearly oval leaves that can reach up to 7 inches in length. The plant produces tubular flowers with greenish or purplish petals, which are not particularly showy but are of ecological importance for native pollinators. This species is adapted to moist, well-drained soils and partial shade conditions found in its native habitat.

In cultivation, Kauai delissea could be used for conservation purposes or as a unique botanical specimen in a garden that mimics its native habitat conditions. It requires consistent moisture and protection from direct sunlight. Due to its rarity and conservation status, it is not commonly found in cultivation. The plant is critically endangered, with threats including habitat destruction by feral pigs, goats, mule deer, and invasive plant species. Germination and seedling establishment are also limited by non-native rodents, snails, and grasses. Efforts to cultivate Delissea rhytidosperma should focus on protecting it from these threats and providing conditions that closely resemble its natural environment.CC BY-SA 4.0