| Wiliwili | |
|---|---|
| |
| Raceme of wiliwili | |
| Conservation status | |
 Vulnerable (IUCN 3.1) | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Genus: | Erythrina |
| Species: | E. sandwicensis |
| Binomial name | |
| Erythrina sandwicensis O.Deg. | |
Wiliwili (Erythrina sandwicensis) is a species of tree in the pea family, Fabaceae, that is endemic to the Hawaiian Islands. It is the only species of Erythrina that naturally occurs there. It is typically found in Hawaiian tropical dry forests on leeward island slopes up to an elevation of 600 m (2,000 ft).
Wiliwili means "repeatedly twisted" in the Hawaiian language and refers to the seedpods, which dehisce, or twist open, to reveal the seeds.
Description
Wiliwili trees grow to a height of 4.5–9 m (15–30 ft) with a gnarled and stout trunk that reaches 0.3–0.9 m (0.98–2.95 ft) in diameter. The bark is smooth, slightly fissured, and covered in gray or black spines up to 1 cm (0.39 in) in length. The bark on the main trunk of mature trees has a distinct orange cast, which is caused by a terrestrial alga.
The wiliwili is summer (dry season) drought deciduous. The dry season usually begins in late April or in May, and trees in the wild typically lose all of their leaves before they bloom. Trees in cultivation may retain much of their foliage through blooming time. The flowers appear in the first half of the dry season, from April through July. They form on horizontal or nearly horizontal racemes that are 7.5–15 cm (3.0–5.9 in) long. The flower color may be orange, yellow, salmon, greenish or whitish. Sometimes all of these colors occur in a single population. The standard petal is erect, not enclosing the other petals. Like all of the erythrinas, the wiliwili is pollinated by birds. The horizontal raceme and the erect standard are adaptations to pollination by passerine birds. Many other erythrinas are pollinated by hummingbirds, which do not occur in Hawaii.
Pods develop and persist on the tree, with the seeds remaining attached long after the pods have opened. The seeds are dislodged by heavy downpours that generally start around November in the islands. Many seeds germinate quickly, and a well-established seedling can grow to 4 ft (1.2 m) in height before the start of the next dry season.
That the wiliwili bears spines is unusual for a species that has evolved in the isolated Hawaiian Islands, without the presence of ungulates or other large herbivores. Many plants in the islands have consequently evolved away the protection of spines. The wiliwili is thought to be closely related to E. tahitensis, a tree endemic to the Tahitian Archipelago, and E. velutina, a widespread species found in tropical South America and the Caribbean.
Distribution
Wiliwili is occasionally seen in cultivation in Hawaiʻi. It is easily propagated from cuttings. Seven other species of Erythrina were under general cultivation in the Hawaiian Islands, but have been mostly extirpated by the alien gall wasp (see Conservation, below). They were popular street trees in dry areas and windbreaks on fields. At least 80 others have been known in botanical gardens there. No non-native species of Erythrina is known to be naturalized in Hawaiʻi.
The wiliwili is distinguished from the other seven cultivated species by a pod with only one to three red or yellow-orange seeds, which sink in water; non-native Erythrina have pods with larger numbers of brown seeds, which float in water.
Uses
Native Hawaiians made a number of items from wiliwili wood because of its low density, such as mouo (fishing net floats), ama (outrigger canoe floats, and extremely long papa heʻe nalu (surfboards) called olo. Olo, which averaged 18 feet (5.5 m), were exclusively ridden by aliʻi (royalty). The wood was sometimes used for the waʻa (hull) of outrigger canoes intended to be used near-shore, for recreation, or for training. The shiny orange-red seeds were strung into lei.
Conservation
Like many other native species in Hawaiʻi, the wiliwili is threatened by competition with non-native species that are free of the diseases, parasites, and herbivores that constrain them in their original habitats.
It was additionally reported in December 2005 that the Hawaiian wiliwili population was under immediate threat due to an infestation by a gall wasp, Quadrastichus erythrinae, which had been first reported in Hawaiʻi in April of that year. This invasive species appears to have arrived in Hawaiʻi via southern Taiwan, Singapore and southern China within only two years. This species was not previously known to science and was formally named and described in 2004. It is thought to have originated in Africa, and the means of its rapid dispersal across South Asia, the Pacific, and southern North America is not understood. The majority of trees of introduced Erythrina species have died as a result of gall wasp infestation. Native wiliwili forests have also been hard hit, particularly Puʻu o Kali on the island of Maui - prior to 2001, the best remaining example of a Hawai'i low elevation dryland forest ecosystem. The USGS-Pacific Island Ecosystems Research Center study site now documents the destructive impact of two invasive insect species (African bruchid beetle Specularius impressithorax and erythrina gall wasp) on Erythrina sandwicensis.
A parasitoid wasp, Eurytoma erythrinae, was released by the Hawaiʻi Department of Agriculture in December 2008 as a biocontrol to minimize the damaging effects of Quadrastichus. Eurytoma wasps lay their eggs in the galls created by Quadrastichus wasps. Eurytoma larvae hatch faster than Quadrastichus larvae, on which they exclusively feed. The introduction of Eurytoma has reduced the population of Quadrastichus to a point where the wiliwili trees no longer die, but still have a much reduced production of viable seeds. That's largely because Eurytoma larvae need to feed on multiple Quadrastichus to complete their development, and egg-laying female Eurytoma therefore ignore small isolated galls containing a single larva. The Hawaii Departments of Agriculture and of Land & Natural Resources therefore plan to introduce a second parasitoid wasp from Africa, Aprostocetus nitens. The smaller A. nityens completes its development feeding from a single Quadrastichus larva, and it is therefore expected to complement Eurytoma by targeting isolated larvae.
History
The genus Erythrina was established by Linnaeus in 1753 in his book, Species Plantarum. The name means "red", a reference to the flower color of some of the well-known species.
In 1786, in his book Encyclopédie Méthodique: Botanique, Jean-Baptiste Lamarck originated the name Erythrina monosperma for a Leguminous tree from India and Southeast Asia. That tree has been known as Butea monosperma ever since William Roxburgh created the genus Butea in 1795.
Unaware of Lamarck's name, Charles Gaudichaud-Beaupré created the name Erythrina monosperma for the Hawaiian Erythrina in 1830 in his book Voyage of the Uranus.
In 1841, William Jackson Hooker and George Arnott used Gaudichaud's name in their book, The Botany of Captain Beechey's Voyage.
Gaudichaud's name, Erythrina monosperma, was used by most of those who described the Hawaiian species of Erythrina throughout the nineteenth century, including William Hillebrand.
In 1932, Otto Degener created the name Erythrina sandwicensis to replace Erythrina monosperma. He stated no reason for the name change. He presented a more complete synonymy than the one given here. Erythrina sandwicensis is the name that has been used since 1932.
Wiliwili hula chant
- Auwe! Pau au i ka manō nui, e!
- Lala-kea niho pa-kolu.
- Pau ka papa-ku o Lono.
- O ka ai ia e ka manō nui,
- O Niuhi maka ahi,
- Olapa i ke kai lipo.
- Ahu e! au-we!
- A pua ka wiliwili,
- A nanahu ka manō
- Auwe! pau ai i ka mano nui!
- Kai uli, kai ele,
- Kai popolohua o Kane.
- A lealea au i kaʻu hula,
- Pau au i ka manō nui!
- Alas! I am seized by the shark, great shark!
- Lala-kea with triple-banked teeth.
- The stratum of Lono is gone,
- Torn up by the monster shark,
- Niuhi with fiery eyes,
- That flamed in the deep blue sea.
- Alas! and alas!
- When the flowers of the wiliwili tree,
- That is the time when the shark-god bites.
- Alas! I am seized by the huge shark!
- O blue sea, O dark sea,
- Foam-mottled sea of Kane!
- What pleasure I took in my dancing!
- Alas! now consumed by the monster shark!
References
- Grave, E.; Kroessig, T. (2020). "Erythrina sandwicensis". IUCN Red List of Threatened Species. 2020: e.T120702630A120702761. doi:10.2305/IUCN.UK.2020-1.RLTS.T120702630A120702761.en. Retrieved 11 August 2023.
- ^ Elbert L. Little Jr. & Roger G. Skolmen (1989). "Wiliwili" (PDF). Common Forest Trees of Hawaii. United States Forest Service. Retrieved 2009-11-21.
- "Erythrina sandwicensis (Fabaceae) - wiliwili". Cal Poly Pomona Questad Lab.
- ^ Warren L. Wagner, Derral R. Herbst, and Sy H. Sohmer. Manual of the Flowering Plants of Hawaii, Revised Edition, 1999. Bishop Museum Press: Hololulu
- ^ George W. Staples and Derral R. Herbst. 2005. "A Tropical Garden Flora" Bishop Museum Press: Honolulu, HI, USA. ISBN 978-1-58178-039-0
- Anne Bruneau. 1996. "Phylogenetic and Biogeographical Patterns in Erythrina (Leguminosae: Phaseoleae) as Inferred from Morphological and Chloroplast DNA Characters". Systematic Botany 21(4):587-605.
- Anne Bruneau. 1997. "Evolution and Homology of Bird Pollination Syndromes in Erythrina (Leguminosae). American Journal of Botany 84(1):54-71.
- ^ Otto Degener. 1932. Flora Hawaiiensis book 5, family 169. (no page numbers).
- Clyde T. Imada, George W. Staples, and Derral R. Herbst. undated. Erythrina At: "Annotated Checklist of Cultivated Plants of Hawaii" At: Botany Databases At: Hawaii Biological Survey (see External links below.)
- Carlquist, S. 1966. The Biota of Long-Distance Dispersal. III. Loss of Dispersibility in the Hawaiian Flora. Brittonia 18(4):310-335
- ^ "wiliwili". Hawaii Ethnobotany Online Database. Bernice P. Bishop Museum. Retrieved 2009-11-21.
- "Erythrina sandwicensis (Fabaceae)". Meet the Plants. National Tropical Botanical Garden. Retrieved 2009-01-31.
- Ben Marcos; Juliana Morais; Jeff Divine & Gary Linden (2007). The Surfboard: Art, Style, Stoke. MBI Publishing Company. pp. 17–19. ISBN 978-0-7603-2753-1.
- A.C. Medeiros C.F. Davenport & C.G. Chimera (1998). "Auwahi: Ethnobotany of a Hawaiian Dryland Forest" (PDF). Cooperative National Park Resources Studies Unit, University of Hawaiʻi at Mānoa: 38–39.
{{cite journal}}: Cite journal requires|journal=(help) - Carolyn Gramling (16 December 2005). "Hawaii's Coral Trees Feel the Sting of Foreign Wasps". Science. 310 (5755). American Association for the Advancement of Science: 1759–1760. doi:10.1126/science.310.5755.1759. PMID 16357239. S2CID 39557367.
- Dennis Hollier (March 2007). "The Seed Savers". Hana Hou!. 10 (1). Pacific Travelogue Inc.
- I.K. Kim, G. Delvare, and J. La Salle. 2004. "A new species of Quadrastichus (Hymenoptera: Eulophidae): A gall-inducing pest on Erythrina (Fabaceae)". Journal of Hymenoptera Research 13:243-249.
- Daniel Rubinoff, Brenden S. Holland, Alexandra Shibata, Russell H. Messing, and Mark G. Wright. 2010. "Rapid Invasion Despite Lack of Genetic Variation in the Erythrina Gall Wasp (Quadrastichus erythrinae Kim)" Pacific Science 64(1):23-31.
- "Limiting factors for dryland forest restoration on Maui Island, Hawaii". USGS Pacific Island Ecosystems Research Center. USGS. Retrieved 10 October 2015.
- Shannon Wianecki (March 2009). "Saving the Wiliwili". Maui Nō Ka ʻOi Magazine. 13 (2). Haynes Publishing Group.
- KEHAULANI CERIZO (Dec 30, 2019). "New wasp could help to protect crucial native trees". Maui Nō Ka ʻOi Magazine. Haynes Publishing Group.
- Carolus Linnaeus. 1753. Species Plantarum 2:706. Laurentii Salvii. (see External Links below).
- Jean-Baptiste Lamarck. 1786. Encyclopédie Méthodique: Botanique 2(1):391-392. In: Encyclopédie Méthodique par ordre de matieres. (see External links below).
- Charles Gaudichaud-Beaupré. 1830. Voyage de l'Uranie. Botanique (full title: Voyage autour du Monde, entrepris par Ordre du Roi, . . . Execute sur les Corvettes de S.M. l'Uranie et la Physicienne . . . par M. Louis de Freycinet. Botanique . . .) page 486 and table 114.
- William Jackson Hooker and George Arnott Walker-Arnott. 1841. The Botany of Captain Beechey's Voyage part 2, page 81. (see External links below).
- William Hillebrand. 1888. Flora of the Hawaiian Islands:99. (reprinted by Lubrecht & Cramer in 1981). (see External links below.)
External links
- Erythrina At: Cultivated Plants At: Botany Databases Archived 2010-12-14 at the Wayback Machine At: HBS
- At: Biodiversity Heritage Library: