Hibiscadelphus

Description

Hibiscadelphus is a small genus of flowering plants in the Hibiscus family (Malvaceae) native to Hawaii. The genus consists of only two known species: Hibiscadelphus giffardianus and Hibiscadelphus wilderianus. Both species are endangered and rare, with H. giffardianus being classified as critically endangered and H. wilderianus as endangered.

Taxonomic Information

Appearance

Hibiscadelphus plants are shrubs or small trees with a height of up to 10 feet. They have dark green leaves that are deeply lobed and serrated, giving them a fern-like appearance. The flowers are large, showy, and trumpet-shaped, with a diameter of up to 4 inches. The petals are usually yellow or orange, with a reddish-brown center.

Care Guide

Hibiscadelphus plants require well-draining soil and regular watering. They prefer partial shade to full sun exposure and are hardy in USDA zones 10-11. Fertilize with a balanced fertilizer every 2-3 months during the growing season. Prune annually to maintain shape and promote new growth.

Common Pests & Diseases

Hibiscadelphus plants are susceptible to root rot, fungal diseases, and nematodes. Common pests include spider mites, aphids, and whiteflies. Regular inspection and treatment with appropriate pesticides or fungicides can help prevent and control these issues.

Habitat

Hibiscadelphus plants are endemic to Hawaii and are found in dry, rocky areas on the islands of Kauai and Molokai. They grow in lowland forests and shrublands and are often found on steep, rocky slopes.

Question and Answer

Q: Why are Hibiscadelphus plants endangered?

A: Hibiscadelphus plants are endangered due to habitat loss, invasive species, and human impact. They are also susceptible to disease and pests, which further threaten their survival.

Q: Can Hibiscadelphus plants be grown outside of Hawaii?

A: It is possible to grow Hibiscadelphus plants outside of Hawaii, but they require a warm, humid climate and specific growing conditions. They are not commonly cultivated outside of their native habitat.

Q: What is the meaning behind the name “Hibiscadelphus”?

A: The name “Hibiscadelphus” comes from the Greek words “hibiscus” (a type of flower) and “adelphus” (brother), referring to the close relationship between this genus and other members of the Hibiscus family.

Q: How can I help conserve Hibiscadelphus plants?

A: You can help conserve Hibiscadelphus plants by supporting conservation efforts, avoiding activities that may harm their habitat, and educating others about their importance and vulnerability.

Related Plants

• Hibiscus
• Abelmoschus
• Alcea
• Gossypium

References

• Wagner, W. L., et al. Manual of the Flowering Plants of Hawai’i. University of Hawaii Press, 1999.
• “Hibiscadelphus.” The IUCN Red List of Threatened Species, IUCN, 2018, www.iucnredlist.org/search?query=Hibiscadelphus&searchType=species.
• Cronk, Q. C. B., & Fuller, J. L. Plant Invaders: The Threat to Natural Ecosystems. Earthscan, 2013.