Hawaiʻi’s Rare Plant Revival: Latest Discoveries and Rediscoveries Celebrated During Native Plant Month

HONOLULU — In a remarkable testament to Hawaiʻi’s enduring botanical wonders, researchers have uncovered five new plant species and rediscovered several others long thought lost to time. These findings, detailed in the Rare Plant Program 2025 Island Highlights report, highlight the fragility and resilience of the islands’ unique ecosystems—many of which exist nowhere else on Earth.

The discoveries arrive as Hawaiʻi celebrates Native Plant Month this April, drawing attention to the urgent need for conservation efforts to protect the state’s critically endangered flora. With over 40% of Hawaiʻi’s native plant species listed as threatened or endangered, these findings offer a glimmer of hope—and a call to action.

Five New Species Found on Kauaʻi

The newly identified plants were discovered during remote expeditions on Kauaʻi, led by the Hawaiʻi Department of Land and Natural Resources (DLNR) Division of Forestry and Wildlife in collaboration with the National Tropical Botanical Garden and the Plant Extinction Prevention Program (PEPP). These species, all endemic to Kauaʻi, include:

• Lysimachia barcae: A delicate shrub with striking purple flowers, known from fewer than a dozen individuals in the wild. Its discovery underscores the vulnerability of Kauaʻi’s remote ecosystems, where invasive species and habitat loss threaten even the most resilient plants.
• Cyrtandra obliquifolia: A member of the African violet family, identified in rugged, high-elevation terrain. Its name reflects the unique oblique shape of its leaves.
• Three additional species, yet to be formally named, were also documented during the surveys. These plants are currently under study to determine their ecological roles and conservation needs.

“The age of discovery is not over,” said a DLNR spokesperson in the report. “These findings remind us that Hawaiʻi’s biodiversity is still revealing its secrets, even in the most inaccessible places.”

Rediscoveries Offer Hope for Lost Species

In addition to the new discoveries, the report highlights the rediscovery of several plant species that had not been seen in decades. Among the most notable:

• A species of haʻiwale (Cyrtandra spp.) on Oʻahu: Last documented in 1943, this plant was feared extinct until botanists located a small population in a remote valley. Its rediscovery provides an opportunity to study its genetic diversity and potential for reintroduction.
• Five species on Lānaʻi: These plants, including members of the Schiedea and Hibiscadelphus genera, were rediscovered after decades without sightings. Their survival in Lānaʻi’s dry forests offers insights into the resilience of Hawaiʻi’s native flora in the face of climate change and invasive species.

“Rediscoveries like these are a reminder that extinction is not always final,” said Hank Oppenheimer, a botanist with the Maui Plant Extinction Prevention Program. “They give us a second chance to protect these species before it’s too late.”

The Race to Protect Hawaiʻi’s Rarest Plants

Hawaiʻi is home to over 1,400 native plant species, nearly 90% of which are found nowhere else in the world. Yet, habitat destruction, invasive species, and climate change have pushed many to the brink of extinction. The Rare Plant Program 2025 report emphasizes the urgent need for coordinated conservation efforts to safeguard these irreplaceable species.

Key initiatives include:

• Ex situ conservation: The Hawaiian Rare Plant Program (HRPP) at the University of Hawaiʻi’s Lyon Arboretum maintains a seed bank and micropropagation laboratory to preserve genetic material from critically endangered plants. The program has successfully propagated over 300 native plant taxa, including 136 federally listed as endangered or threatened.
• In situ protection: Efforts to restore native habitats and control invasive species are critical to ensuring the survival of newly discovered and rediscovered plants. The Laukahi Network, a coalition of conservation groups, coordinates these efforts across the islands.
• Community engagement: Public awareness campaigns and citizen science initiatives, such as seed collection programs, play a vital role in conservation. The Laukahi Network’s “Plant Promise” campaign, for example, aims to raise $14,000 to support the protection of each of Hawaiʻi’s native plant species.

Why These Discoveries Matter

The discovery and rediscovery of these plants are more than scientific milestones—they are a call to action. Each species represents a unique evolutionary story, shaped by millions of years of isolation in Hawaiʻi’s volcanic landscapes. Losing even one would mean erasing a piece of the planet’s natural heritage.

“These plants are not just part of Hawaiʻi’s biodiversity; they are part of its culture and identity,” said a representative from the Laukahi Network. “Protecting them is a responsibility we all share.”

What’s Next for Hawaiʻi’s Rare Plants?

The findings from the Rare Plant Program 2025 report will guide future conservation efforts, including:

• Targeted surveys in understudied regions of Kauaʻi, Maui, and the Big Island to search for additional undiscovered species.
• Genetic studies to assess the viability of rediscovered populations and inform reintroduction strategies.
• Expanded ex situ conservation programs to preserve genetic material from newly discovered species.
• Public education initiatives to raise awareness about the importance of native plants and the threats they face.

Key Takeaways

• Five new plant species were discovered on Kauaʻi, including Lysimachia barcae and Cyrtandra obliquifolia, all of which are endemic to the island.
• Several species, including a haʻiwale on Oʻahu and five species on Lānaʻi, were rediscovered after decades without sightings.
• Hawaiʻi is home to over 1,400 native plant species, nearly 90% of which are found nowhere else in the world.
• Conservation efforts, including ex situ and in situ programs, are critical to protecting these species from extinction.
• Public engagement and funding are essential to support ongoing conservation initiatives.

FAQ

Why are Hawaiʻi’s plants so unique?

Hawaiʻi’s isolation from other landmasses has allowed its native plants to evolve in unique ways, resulting in a high level of endemism. Nearly 90% of Hawaiʻi’s native plant species are found nowhere else on Earth.

What are the biggest threats to Hawaiʻi’s native plants?

The primary threats include habitat destruction, invasive species, climate change, and human activity. Invasive plants and animals, such as feral pigs and goats, can outcompete or directly harm native species, while rising temperatures and changing rainfall patterns disrupt delicate ecosystems.

How can I aid protect Hawaiʻi’s rare plants?

There are several ways to acquire involved:

• Support conservation organizations like the Laukahi Network or the National Tropical Botanical Garden through donations or volunteer work.
• Participate in citizen science initiatives, such as seed collection programs or habitat restoration projects.
• Educate yourself and others about the importance of native plants and the threats they face.
• Advocate for policies that protect native habitats and control invasive species.

Are these newly discovered plants already endangered?

Many of the newly discovered species, such as Lysimachia barcae, are already considered critically endangered due to their small population sizes and the threats they face from habitat loss and invasive species. Conservation efforts are urgently needed to protect these plants from extinction.

What is ex situ conservation?

Ex situ conservation involves protecting species outside their natural habitats, such as in seed banks, botanical gardens, or micropropagation laboratories. This approach helps preserve genetic material and provides a safety net for species that may no longer be able to survive in the wild.

Conclusion

The discovery of five new plant species and the rediscovery of several others long thought lost are cause for celebration—and a reminder of the work that remains. As Hawaiʻi continues to grapple with the challenges of climate change and habitat loss, these findings underscore the importance of conservation efforts to protect the islands’ unique biodiversity.

“Every plant we save is a victory for Hawaiʻi’s natural heritage,” said a DLNR spokesperson. “But the clock is ticking, and we must act now to ensure these species survive for future generations.”

For those inspired to learn more or get involved, the Rare Plant Program 2025 Island Highlights report offers a comprehensive look at the state’s ongoing conservation efforts. Together, we can help write the next chapter in Hawaiʻi’s botanical story—one of hope, resilience, and renewal.