Cyrtandra dentata, commonly known as mountain cyrtandra or sharp-toothed cyrtandra, is a rare, endangered perennial herb endemic to the moist forests of the Waianae and Koʻolau Mountains on Oahu, Hawaii. It is typically found in the understory of these forests, where it can reach up to 16 feet tall. The plant features lance-shaped leaves with serrated margins and produces tubular white flowers that are attractive to native pollinators. Flowering occurs throughout the year, with a peak in the summer months. The flowers, while not particularly showy, are of interest to those who appreciate the subtleties of native Hawaiian flora.

Mountain cyrtandra is valued for its role in native plant restoration and conservation landscaping. It requires consistently moist soil conditions and partial to full shade, mimicking its natural forest habitat. While it is not commonly used in general horticulture due to its rarity, it is of significant interest for conservation purposes. In cultivation, it is important to protect it from habitat degradation factors such as feral pigs and invasive plant species. Efforts to conserve Cyrtandra dentata include seed collection and habitat protection measures implemented by organizations like the US Army.CC BY-SA 4.0