Pictetia

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Pictetia
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Dalbergieae
Genus: Pictetia
DC.
Species[1][2][3]
Synonyms
  • Belairia A.Rich. 1845

Pictetia is a genus of about eight species of trees and shrubs in the family Fabaceae with spiny stems and (in six of the eight species) spine-tipped leaflets.[4] The genus is endemic to the Greater Antilles,[5] but its closest relatives are in Mesoamerica and Africa.[6]

Description

Species of Pictetia range from erect, single-stemmed trees to multi-stemmed shrubs. They can have smooth or scaly bark. The leaves and branches branch off from the stem in an

pinnately compound with an odd number of leaflets. The leaflets, like the leaves, are arranged in an alternating fashion.[4]

The flowers, which are the typical pea flowers of the Faboideae, are borne in racemes. The flowers either grow singly or in clusters along the raceme. The fruit is a flattened legume with prominent veins running along its length.[4]

Taxonomy

The genus Pictetia was described by Swiss botanist

lectotype since it was, in their analysis, the species with the fewest specialised traits.[4]

Evolution

Pictetia is a member of the tribe

nucleotide substitution rates, Pictetia was later estimated to be 7.2 ± 1.2 million years old, while Diphysa and Pictetia shared common ancestry 15.0 ± 2.5 million years ago and Pictetia and Ormocarpum separated by 14.5 ± 2.6 million years.[6] This suggests that the presence of Pictetia in the Caribbean reflects the dispersal of its ancestral species into the region long after the islands became isolated from the mainland.[12] The overall distribution of these genera requires at least one dispersal event across the Atlantic Ocean, given that the genera share common ancestry long after the separation of South America and Africa.[6]

Distribution

Pictetia is restricted to

U.S. Virgin Islands.[5] P. aculeata, the species with the easternmost distribution, is found in the British and U.S. Virgin Islands and Puerto Rico.[13] P. obcordata which is endemic to the island of Hispaniola, is found both in the Dominican Republic and in Haiti.[14] P. sulcata is found both in Hispaniola and Cuba,[15] while the remaining species (P. angustifolia,[16] P. marginata,[17] P. mucronata,[18] P. nipensis[19] and P. spinosa[20]
) are Cuban endemics.

Notes

  1. JSTOR 2666709
    .
  2. ^ "ILDIS LegumeWeb entry for Pictetia". International Legume Database & Information Service. Cardiff School of Computer Science & Informatics. Retrieved 7 February 2014.
  3. USDA; ARS; National Genetic Resources Program. "GRIN species records of Pictetia". Germplasm Resources Information Network—(GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original
    on 24 September 2015. Retrieved 7 February 2014.
  4. ^ a b c d e Beyra & Lavin (1999), pp.36–38
  5. ^
    doi:10.1663/0006-8101(2007)73[183:SPGETT]2.0.CO;2
    .
  6. ^
    PMID 15519969
    .
  7. ^ a b Beyra & Lavin (1999), pp.2–3
  8. ^ Beyra & Lavin (1999)
  9. PMID 11250829
    .
  10. doi:10.1016/j.sajb.2013.05.001
    .
  11. ^ Beyra & Lavin (1999); p. 32-36
  12. doi:10.1007/s12229-008-9006-8
    .
  13. ^ Beyra & Lavin (1999), pp. 42–45
  14. ^ Beyra & Lavin (1999), pp. 40–42
  15. ^ Beyra & Lavin (1999), pp. 45–52
  16. ^ Beyra & Lavin (1999), pp. 60–63
  17. ^ Beyra & Lavin (1999), pp. 52–56
  18. ^ Beyra & Lavin (1999), pp. 56–60
  19. ^ Beyra & Lavin (1999), pp. 65–67
  20. ^ Beyra & Lavin (1999), pp. 63–65

References

  • Beyra M, Lavin M (1999). "Monograph of Pictetia (Leguminosae: Papilionoideae) and Review of the Aeschynomeneae".
    JSTOR 25096650
    .
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