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Erythrina velutina

Erythrina velutina is a species of leguminous tree. It is indigenous to Brazil, Peru, Ecuador, Colombia, Venezuela, and Hispaniola and has been introduced to much of the Caribbean, Uganda, and Sri Lanka. It also occurs on the Galápagos Islands, but whether it is indigenous or introduced there is unclear.[1] In Brazil, it occurs on plains and near rivers in the arid parts of the northeast of the country[2] and is commonly known as "mulungu".[3] Erythrina velutina grows as a large tree to around 10 m (30 ft) high and has short spines on the stem.[4] It is perennial.[1]

Erythrina velutina
A few spiny branches with developing flowers on them. In the middle are five or more blowing flowers; they have an orange sac in the middle, surrounded by orange flower leaves, with a multitude of red strips on top.
Flower in Brisbane, Australia
Tree in Brisbane, Australia
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Genus: Erythrina
Species:
E. velutina
Binomial name
Erythrina velutina
Synonyms[1]
  • Chirocalyx velutinus Wallp.
  • Corallodendron velutinum (Willd.) Kuntze
  • Erythrina aculeatissima Desf.
  • Erythrina aurantica Ridl.
  • Erythrina splendida Diels

Taxonomy

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The species was first described in 1801 by Carl Ludwig Willdenow. Henry Nicholas Ridley described Erythrina aurantiaca as a species from Fernando de Noronha off the northeastern coast of Brazil, but this tree is now seen as only a form of E. velutina, Erythrina velutina f. aurantiaca.[5]

Blooming

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On Fernando de Noronha, it flowers in the dry season.[6] There are 10 to 26 flowers per inflorescence, of which one to eight open each day. Flowers open early in the morning, between 6 and 6:30 am.[7] They remain open for two days, but produce nectar only the first day. All native land vertebrates of the island, including the Noronha dove (Zenaida auriculata noronha), vireo (Vireo gracilirostris), elaenia (Elaenia ridleyana), and skink (Trachylepis atlantica), pollinate the species on Fernando de Noronha.[6] No other Erythrina species is pollinated by doves or lizards.[8]

Uses

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In northeastern Brazil, the bark of E. velutina is used in traditional medicine against insomnia, convulsions, nervous coughs, and nervous excitation. Harvesting of bark for medicinal purposes poses a threat to the survival of the species; for this reason, several scientific studies of the medicinal effects of tree have used extract from the leaves instead.[9] In laboratory mice and rats, E. velutina extract prolongs sleep, inhibits motorial activity, and inhibits memory.[10]

Erythrina velutina contains the indole based alkaloid Hypaphorine which has shown sleep promoting effects in mice [11]

Toxicity

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Its seeds are similar to beans, but are red and toxic. The seeds should not be ingested by the risk of death.[12]

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References

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  1. ^ a b c LegumeWeb, 2010
  2. ^ Rabelo et al., 2001, p. 543
  3. ^ Dantas et al., 2004, p. 129
  4. ^ Fawcett and Rendle, 1920, p. 51
  5. ^ Krukoff, 1979, p. 443
  6. ^ a b Sazima et al., 2009, p. 26
  7. ^ Sazima et al., 2009, p. 27
  8. ^ Sazima et al., 2009, p. 29
  9. ^ Carvalho et al., 2009, p. 374
  10. ^ Dantas et al., 2004, p. 132
  11. ^ Ozawa, Masaaki; Honda, Kazuki; Nakai, Izumi; Kishida, Akio; Ohsaki, Ayumi (15 July 2008). "Hypaphorine, an indole alkaloid from Erythrina velutina, induced sleep on normal mice". Bioorganic & Medicinal Chemistry Letters. 18 (14): 3992–3994. doi:10.1016/j.bmcl.2008.06.002. PMID 18571406.
  12. ^ "Mulungu-da-caatinga (Erythrina velutina Willd.)" (in Portuguese). Retrieved 2019-06-24.

Literature cited

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