Retama

Retama is a genus of flowering bushes in the legume family, Fabaceae. It belongs to the broom tribe, Genisteae.[1] Retama broom bushes are found natively in North Africa, the Levant and some parts of southern Europe. Retama raetam and Retama monosperma have white flowers, while Retama sphaerocarpa has yellow flowers. It remains an open question in taxonomy whether the members of the genus Retama should be incorporated into the genus Genista (see Genisteae).

Retama
White flowers of Retama rhodorhizoides
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Papilionoideae
Tribe: Genisteae
Genus: Retama
Raf.
Species

4–14; see text.

Synonyms
  • Lygos Adans., nom. rej.

The species contain cytisine, a toxic alkaloid.

In the Spanish language the name "retama" is in common use for broom bushes in general, including the genus Retama.

Taxonomy

The genus Retama was erected in 1838 by Constantine Samuel Rafinesque, the genus name being derived from the Arabic name. Rafinesque noted that the genus had been included in other genera, including Spartium, Cytisus and Genista, but he regarded it as distinct.[2]

The name Lygos was once used for Retama;[3][4][5] it is now a rejected name (nomen rejiciendum) in the International Code of Nomenclature for algae, fungi, and plants.[6] Michel Adanson described and classified the genus referencing to the Greek plant "lygos" and to Pedanius Dioscorides.[7] In the ancient Greek language, lygos (λύγος) was the name of the plant Vitex agnus-castus (chaste tree)[8] or willow or other plants with pliant twigs.[9] The same word (in some cases Latinized as Lygus) was used in botany and zoology for various taxonomic groups as a component of names, e.g. Lygodysodea, Lygisyum, Lygistum, Lygodesmia etc.[10][11]

Retama is traditionally placed in the tribe Genisteae, and in the subfamily Papilionoideae in the 2017 classification of the family Fabaceae (Leguminosae).

Species

The number of species in the genus and their circumscription varies. As of February 2018, Plants of the World Online, based on the African Plant Database, accepted the following species:[12]

R. rhodorhizoides is included in R. monosperma by some sources,[13] and has been identified as R. raetam by others.[14] When recognized as a separate species, it is restricted to the Canary Islands.[15]

Species names with uncertain taxonomic status

The status of the following species is unresolved:[16]

  • Retama albiflora Raf.
  • Retama angulata Griseb.
  • Retama atlantica Pomel
  • Retama bovei (Spach) Webb
  • Retama hipponensis Webb
  • Retama lutea Raf.
  • Retama microcarpa Webb
  • Retama parviflora (Vent.) Webb
  • Retama recutita Webb ex Bolle
  • Retama webbii Webb
  • Female bee (Colletes sp.) collecting nectar from a Retama raetam flower, Holot Mash'abim, Northern Negev, Israel

References
  1. Cardoso D, Pennington RT, de Queiroz LP, Boatwright JS, Van Wyk BE, Wojciechowski MF, Lavin M (2013). "Reconstructing the deep-branching relationships of the papilionoid legumes". S Afr J Bot. 89: 58–75. doi:10.1016/j.sajb.2013.05.001.
  2. Rafinesque, Constantine Samuel (1838), "82. Retama", Sylva Telluriana, Philadelphia, p. 22, retrieved 2018-02-15
  3. James Cullen, Sabina G. Knees, The European Garden Flora Flowering Plants: Manual for the Identification of Plants Cultivated in Europe, Both Out-Of-Doors and Under Glass, Cambridge University Press, 2011, p. 410.
  4. European Environment Agency, Thermo-mediterranean (Lygos raetam) brush
  5. Hanelt P. & Institute of Plant Genetics and Crop Plant Research (eds.), Mansfeld's Encyclopedia of Agricultural and Horticultural Crops, Springer Verlag, Germany, 2001, p. 924
  6. "Lygos Adans.", Germplasm Resources Information Network (GRIN), Agricultural Research Service (ARS), United States Department of Agriculture (USDA), retrieved 2018-02-13
  7. Adanson M. (1763) Familles des Plantes, Paris, vol. 2, pp. 321, 573. Note: In p. 573 the name is printed as “Lugos”.
  8. Henry George Liddell, Robert Scott, A Greek-English Lexicon
  9. Brown, Roland Wilbur, Composition of scientific words: a manual of methods and a lexicon of materials for the practice of logotechnics, Smithsonian Institution Press, 1979 p. 856.
  10. George Don, A general history of the Dichlamydeous plants, London, 1834, vol. 3, p. 483, 560.
  11. Brown, p. 485: Lygus oblineatus (bug).
  12. "Retama Raf.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2018-02-15
  13. "Retama monosperma (L.) Boiss.", The Plant List, retrieved 2018-02-15
  14. "Retama raetam auct". African Plant Database. Conservatoire et Jardin botaniques & South African National Biodiversity Institute. Retrieved 2018-02-15.
  15. "Retama rhodorhizoides Webb & Berthel.", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2018-02-15
  16. "The Plant List entry for Retama". The Plant List. Royal Botanic Gardens, Kew and the Missouri Botanical Garden. 2013. Retrieved 15 April 2014.
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