Opening/Closure Status

The grounds of the USBG will be closed September 18, 2021. On other days, all outdoor gardens are currently open. The Conservatory and public restrooms remain closed, due to the closure of the U.S. Capitol campus buildings. Please monitor www.USBG.gov for updates on operating status. USBG resources can be accessed online, including educational materials, virtual tours, and online programs by visiting www.USBG.gov/AtHome.

Kauai delissea

Delissea rhytidosperma
Plant Botanical Name: 
Delissea rhytidosperma
USBG Plant Location: 
Conservatory
Conservatory Room Location: 
Hawaii
Plant Threat Level: 
Endangered

Delissea rhytidosperma is an endangered member of the Lobelia family found only on the island of Kauai. The lowland forest habitat where this species grows has been disturbed by overgrazing of domestic and wild animals, the encroachment of invasive nonnative plant species, and naturally occurring landslides. Currently, only 15 plants survive in two remaining wild populations. Measures are being taken to protect these remaining populations, including weed control, fire suppression and fencing to exclude animals and humans. Botanical gardens and seed banks are also working to conserve these plants and seeds.