Heliotropium arboreum

Heliotropium arboreum is a species of flowering plant in the borage family, Boraginaceae. It is native to tropical Asia including southern China, Madagascar, northern Australia, and most of the atolls and high islands of Micronesia and Polynesia. Common names include velvetleaf soldierbush,[2] tree heliotrope, veloutier, and octopus bush. It is a shrub or small tree typical of littoral zones reaching a height of 3.6 m (12 ft), with a spread of about 5 m (16 ft).

Heliotropium arboreum
In the Hawaiian Islands
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Boraginales
Family: Boraginaceae
Genus: Heliotropium
Species:
H. arboreum
Binomial name
Heliotropium arboreum
(Blanco) Mabb.
Synonyms
  • Argusia argentea (L.f.) Heine
  • Heliotropium foertherianum Diane & Hilger
  • Messerschmidia argentea (L.f.) I.M.Johnst.
  • Tournefortia arborea Blanco
  • Tournefortia argentea L.f.

Taxonomy

Originally published as Tournefortia argentea, it was transferred to Argusia argentea, and remained under that name until recently. It was subsequently restored to the genus Tournefortia before being transferred into the genus Heliotropium under a new name in 2003.[3][4]

Tree Heliotrope grove in Hawaii

Botanical Description

The Tree Heliotrope is a small to medium sized growing tree that typically reaches heights of 12 feet. The leaves of this tree are light green in color, silvery in sheen, and silky in texture. The tree produces small fruits and flowers during its bloom, (May through November). The flowers are tiny, only reaching .24 inches in diameter, white, and don’t begin to appear until the tree has reached a few years of age. The fruits it produces are small, opaque and fleshy. The bark is light gray/brown and is corrugated.

Uses
Flower

Wood

The wood of H. arboreum is commonly used to make handicrafts, tools, and, in Polynesia, frames for swim goggles. Due to its availability, H. arboreum is used as firewood, and has become rare in some areas as a result.[5]

Leaves

In the Marshall Islands, corpses are washed in water soaked with the leaves of the tree heliotrope to mask smells.  The leaves are used as a spice on some islands, and can also be eaten raw as a salad. In Kiribati, oil from the leaves is used to make deodorant.[6]

Medicinal

Octopus bush is used in many Pacific islands as a traditional medicine to treat ciguatera fish poisoning, which is caused by powerful ciguatoxins produced by microscopic Gambierdiscus algae. Scientists from the Institute of Research for Development (IRD) and the Louis Malarde Institute in French Polynesia and Pasteur Institute in New Caledonia are researching the plant chemistry and believe that senescent leaves contain rosmarinic acid and derivatives, which are known for its antiviral, antibacterial, antioxidant, and anti-inflammatory properties.[7] The researchers think that rosmarinic acid removes the ciguatoxins from their sites of action, as well as being an anti-inflammatory agent.

Coastal Protection

The preferred growing conditions of ''H. Arboreum'' are in the littoral zone. It thrives in sandy barren soil with high drainage. It is capable of withstanding sea spray, and can grow in heavy winds. The tree is also a drought resistant variety, allowing it to survive the subtropical dry season of the South Pacific. These factors, plus the roots of "H. Arboreum" taking hold in the sand, help stabilize the shore, mitigating coastal erosion.[5][6]

References
  1. Razafiniary, V.; Hills, R. (2021). "Heliotropium arboreum". IUCN Red List of Threatened Species. 2021: e.T165436903A165436944. doi:10.2305/IUCN.UK.2021-1.RLTS.T165436903A165436944.en. Retrieved 16 November 2021.
  2. USDA, NRCS (n.d.). "Tournefortia argentea". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 11 December 2015.
  3. Hilger, Hartmut H. (1 December 2003). "IngentaConnect A systematic analysis of Heliotropiaceae (Boraginales) based on t". Botanische Jahrbücher. 125: 19–51. doi:10.1127/0006-8152/2003/0125-0019.
  4. "Heliotropium foertherianum Diane & Hilger". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
  5. Manner, Harley I. “Tournefortia Argentea (Tree Heliotrope).” Species Profile for Pacific Island Agroforestry, Apr. 2006
  6. Montoya, John Edward, and Richard Criley. “Expanding Tree Diversity in Hawai'i's Landscapes: Beach Heliotrope, Tournefortia Argentea.” University of Hawai'i, Mar. 2014.
  7. Rossi F, Jullian V, Pawlowiez R, Kumar-Roiné S, Haddad M, Darius HT, Gaertner-Mazouni N, Chinain M, and Laurent D (August 2012). "Protective effect of Heliotropium foertherianum (Boraginaceae) folk remedy and its active compound, rosmarinic acid, against a Pacific ciguatoxin". Journal of Ethnopharmacology (published 30 August 2012). 143 (1): 33–40. doi:10.1016/j.jep.2012.05.045. PMID 22706150.
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