Arfeuillea

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Arfeuillea
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Subfamily: Dodonaeoideae
Genus: Arfeuillea
Pierre ex Radlk.
Species:
A. arborescens
Binomial name
Arfeuillea arborescens
Pierre ex Radlk.

Arfeuillea is a monotypic genus in the family Sapindaceae with Arfeuillea arborescens as its only species. [1] Commonly known as hop tree, this species is characterized by compound leaves arranged spirally around the branches, flowers with small white petals and larger red sepals, and dehiscent papery yellow fruits with two black seeds encased. It is native to Laos and Thailand but is cultivated only and not found in the wild. The species serves as a street tree across its native range and in Malaysia and Singapore, and its antioxidant-rich leaves are included in many Thai herbal medicines. [2]

Contents

Description

Stem morphology of Arfeuillea arborescens. Leaves are arranged in a spiral around the branches. Arfeuillea Aborscens stem.png
Stem morphology of Arfeuillea arborescens. Leaves are arranged in a spiral around the branches.
Arfeuillea arborescens has a bisexual flower with small white pedals surrounded by large red sepals. Arfeuillea Aborscens flower.png
Arfeuillea arborescens has a bisexual flower with small white pedals surrounded by large red sepals.

Arfeuillea arborescens develops as a tree with a bushy, round crown. Its leaves are compound and include 3-4 pairs of entire (though sometimes serrate), elliptical leaflets, which are arranged spirally around the branches. The flowers are bisexual, have small white petals surrounded by larger red sepals, and are arranged in branched inflorescences. Fruits are simple, dehiscent, and golden yellow in color. They have three wings, are papery, and contain two large, ovular black seeds. [2]

Distribution and habitat

Arfeuillea aborescens is from southeast Asia, specifically Laos and Thailand. However, wild specimens are rare. Arfeuillea aborescens is exclusively cultivated. [3]

Taxonomy

There is only one species in this genus: Arfeuillea arborescens. Once grouped in the Koelreuteria genus, a synonymous name for this species is Koelreuteria arborescens. In calling it Arfeuillea arborescens, Pierre, the botanist who first described the species, named it after his friend, Arfeuille. [3]

Evolution and phylogeny

Arfeuillea arborescens is in the family Sapindaceae, the tribe Harpullieae, the subfamily Dodonaeoideae, the group Dodonaea, and the monotypic genus Arfeuillea. [4] The subfamily Dodonaeoideae is characterized by its dehiscent fruits. Arfeuillea arborescens’ closest relative is Conchopetalum brachysepalum , a member of Sapindaceae native to Madagascar. [5]

Human uses

Arfeuillea are cultivated only. [3] They are mainly planted alongside streets in residential areas in Malaysia, Singapore, and Thailand, but they can also be used as a spice. [2] Fresh leaves of Arfeuillea arborescens contain antioxidant properties, so they are included in many Thai medicinal herbs. [6]

Hybrids

Arfeuillea does not have any publicly documented hybrids outside of Arfeuillea arborescens. Since it is cultivated, there is a possibility for man made hybrids to exist.

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References

  1. "Arfeuillea Pierre ex Radlk". www.gbif.org. GBIF . Retrieved 2020-12-16.
  2. 1 2 3 "Arfeuillea arborescens". FLORA & FAUNA WEB. National Parks Board. Retrieved 3 December 2020.
  3. 1 2 3 "Arfeuillea arborescens". Urban Forest. Retrieved 3 December 2020.
  4. Buekri, S.; Lowry, I.; Alvarez, N.; Razafimandimbison, S. G.; Küpfer, P.; Callmander, M. W. (2010). "Phylogeny and circumscription of Sapindaceae revisited: molecular sequence data, morphology and biogeography support recognition of a new family, Xanthoceraceae". Plant Ecology and Evolution. 143 (2): 148-159. doi:10.5091/plecevo.2010.437. hdl: 10261/27490 .
  5. Harrington, M. (2008). "Phylogeny and evolutionary history of Sapindaceae and Dodonaea". Doctoral Dissertation, James Cook University.
  6. Wasupongpun, W.; Premkaisorn, P. (2010). "Evaluation of Antioxidant Activity of Eleven Thai Medicinal Herbs" (PDF). Srinakharinwirot Science Journal. 26 (1): 30-38.