Euphorbia lamarckii

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Euphorbia lamarckii
Euphorbia broussonetii by Scott Zona 001.jpg
CITES Appendix II (CITES) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Euphorbiaceae
Genus: Euphorbia
Species:
E. lamarckii
Binomial name
Euphorbia lamarckii
Sweet [2]
Synonyms [2]
  • Euphorbia virgataDesf., nom. illeg.
  • Euphorbia obtusifoliaPoir., nom. illeg.
  • Tithymalus virgatusHaw.
  • Tithymalus obtusifoliusKlotzsch & Garcke
  • Tirucalia virgata(Haw.) P.V.Heath
  • Euphorbia broussonetiiWilld. ex Link
  • Euphorbia obtusifolia var. wildpretiiMolero & Rovira

Euphorbia lamarckii is a species of flowering plant in the family Euphorbiaceae, native to the western Canary Islands (Tenerife, north-western La Gomera, La Palma and El Hierro). [2] It resembles Euphorbia regis-jubae , with which it has been confused. Both have been called Euphorbia obtusifolia.

Contents

Description

Euphorbia lamarckii resembles Euphorbia regis-jubae ; their distributions do not overlap. It is a shrub up to 2 m (7 ft) tall, with light brown stems, undivided leaves and small yellowish-green floral bracts. The inflorescence is usually a compound umbel. The elaiosome (caruncle) attached to a seed is sessile or has only a very short stalk. [3] It differs from other Canary Island species of Euphorbia in the shape of the compound, umbel-like inflorescences, that are yellow-greenish in colour, and by the floral bracts falling off before the fruit ripens. [4]

Taxonomy

Euphorbia lamarckii was first described by Robert Sweet in 1818. It is considered to be synonymous with E. obtusifoliaPoir. and E. broussonetii, [2] but not with E. obtusifoliaLam. [5] There has been considerable confusion over the scientific name to be used for one of the more common species of "tabaiba" found in the Canary Islands. [6] [4] Much of the literature used the name E. obtusifoliaPoir., based its publication by Jean Poiret in 1812. However, the name had already been used in a different context by Jean-Baptiste Lamarck in 1788, so Poiret's name is illegitimate. A proposal to conserve the name Euphorbia obtusifoliaPoir., in view of its widespread use, was rejected in 2000. Although the name Euphorbia broussonetii has been used (and defended) by some sources, [7] the earliest, and hence correct, name is considered to be Euphorbia lamarckii. [2] [6] [4]

An additional complication is that the name Euphorbia obtusifolia has been used "indiscriminately" for two species found in the Canary Islands: the western species, now called E. lamarckii, and the eastern species Euphorbia regis-jubae . In 2003, David Bramwell listed seven publications from 1847 to 1993 that gave the wrong names or the wrong distributions for these species. [7]

Varieties

Julián Molero and Ann Maria Rovira recognize two varieties: [6]

The varieties differ in that var. broussonettii has broader leaves with a more rounded tip, and the outermost bracts have a less pointed apex with a shorter point (mucro). [6]

Distribution

Euphorbia lamarckii is native to the western Canary Islands: Tenerife, north-west La Gomera, La Palma and El Hierro. [2] Its distribution does not overlap with Euphorbia regis-jubae , which is found in the eastern islands: Gran Canaria, Lanzarote and Fuerteventura. [7]

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References

  1. "Appendices | CITES". cites.org. Retrieved 2024-01-17.
  2. 1 2 3 4 5 6 "Euphorbia lamarckii", World Checklist of Selected Plant Families , Royal Botanic Gardens, Kew , retrieved 2018-01-27
  3. Bramwell, David & Bramwell, Zoë (2001), Wild Flowers of the Canary Islands (2nd ed.), Madrid: Editorial Rueda, pp. 208–209, ISBN   978-84-7207-129-2 (as E. broussonetii)
  4. 1 2 3 González, Manuel Luis Gil (2018), "Euphorbia lamarckii Sweet", Flora Vascular de Canarias, retrieved 2018-01-29
  5. "Euphorbia obtusifolia Lam.", World Checklist of Selected Plant Families , Royal Botanic Gardens, Kew , retrieved 2018-01-29
  6. 1 2 3 4 Molero, Julián & Rovira, Anna Maria (2004), "Euphorbia lamarckii Sweet, correct name for E. obtusifolia Poir. non Lam." (PDF), Vieraea, 32: 117–122, retrieved 2018-01-29
  7. 1 2 3 Bramwell, David (2003), "Observations on a proposal to conserve the name Euphorbia obtusifolia Poiret.", Botánica Macaronésica (24): 143–147, retrieved 2018-01-29