Swartzieae

The tribe Swartzieae is an early-branching monophyletic clade of the flowering plant subfamily Faboideae or Papilionaceae. Traditionally this tribe has been used as a wastebasket taxon to accommodate genera of Faboideae which exhibit actinomorphic, rather than zygomorphic floral symmetry and/or incompletely differentiated petals and free stamens.[1][3] It was recently revised and most of its genera were redistributed to other tribes (Amburaneae, Baphieae, and Exostyleae).[1][4][5] Under its new circumscription, this clade is consistently resolved in molecular phylogenies.[1][4][6][7][8][9][10][2][11] Members of this tribe possess "non-papilionate swartzioid flowers[…]largely characterized by a tendency to lack petals combined with a profusion and elaboration of free stamens"[1][4] and a "lack of unidirectional order in the initiation of the stamens".[2] They also have "complete or near complete fusion of sepals resulting from intercalary growth early in development, relatively numerous stamens, and a single or no petal, with other petals not at all apparent in development."[12] The tribe is predicted to have diverged from the other legume lineages 48.9±2.8 million years ago (in the Eocene).[10]

Swartzieae
Swartzia picta
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Rosids
Order:
Fabales
Family:
Fabaceae
Subfamily:
Faboideae
Tribe:
Swartzieae

(DC. 1825) Cardoso et al. 2013[1]
Type genus
Swartzia Schreb.
Subclades and Genera

See text.

Distribution of the Swartzieae
Synonyms
  • Swartziaceae Bartling
  • Swartzieae clade
  • Swartzieae sensu stricto
  • Swartzioid clade Torke and Schaal 2008[2]
  • Swartzioids sensu lato
  • Tounateeae Baill. 1870

Subclades and genera

Swartzioids sensu stricto Ireland et al. 2000

The members of this clade occur mainly in lowland rain forests.[4][6][2]

Atelioids Ireland et al. 2000

The members of this clade are distinguished by "a nearly actinomorphic androecium with basifixed anthers, exarillate seeds, and a tendency toward alternate leaflets."[4][2] They occur mainly in neotropical, seasonally-dry tropical woodlands.[4]

References
  1. Cardoso D; Pennington RT; de Queiroz LP; Boatwright JS; Van Wyk B-E; Wojciechowskie 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. Torke BM; Schaal BA (2008). "Molecular phylogenetics of the species-rich neotropical genus Swartzia (Leguminosae, Papilionoideae) and related genera of the swartzioid clade". Am J Bot. 95 (2): 215–228. doi:10.3732/ajb.95.2.215. PMID 21632346.
  3. Polhill RM (1994). "Classification of the Leguminosae". In Bisby FA; Buckingham J; Harborne JB (eds.). Phytochemical Dictionary of the Leguminosae, Plants and Their Constituents. 1. Chapman and Hall/CRC Press, London. pp. xxv–xlvii. ISBN 9780412397707.
  4. Cardoso D; de Queiroz LP; Pennington RT; de Lima HC; Fonty É; Wojciechowski MF; Lavin M (2012). "Revisiting the phylogeny of papilionoid legumes: new insights from comprehensively sampled early-branching lineages". Am J Bot. 99 (12): 1991–2013. doi:10.3732/ajb.1200380. PMID 23221500.
  5. Wojciechowski MF (2013). "Towards a new classification of Leguminosae: Naming clades using non-Linnaean phylogenetic nomenclature". S Afr J Bot. 89: 85–93. doi:10.1016/j.sajb.2013.06.017.
  6. Ireland HE; Pennington RT; Preston J (2000). "Molecular systematics of the Swartzieae". In Herendeen PS; Bruneau A (eds.). Advances in Legume Systematics, Part 9. Kew, UK: Royal Botanic Gardens. pp. 277–298. ISBN 184246017X.
  7. Pennington RT; Lavin M; Ireland H; Klitgaard B; Preston J; Hu J-M (2001). "Phylogenetic relationships of basal papilionoid legumes based upon sequences of the chloroplast trnL intron". Syst Bot. 55 (5): 818–836. doi:10.1043/0363-6445-26.3.537 (inactive 2021-01-17). JSTOR 3093980.CS1 maint: DOI inactive as of January 2021 (link)
  8. Wojciechowski MF; Lavin M; Sanderson MJ (2004). "A phylogeny of legumes (Leguminosae) based on analysis of the plastid matK gene resolves many well-supported subclades within the family". Am J Bot. 91 (11): 1846–1862. doi:10.3732/ajb.91.11.1846. PMID 21652332.
  9. Ireland HE (2005). "Tribe Swartzieae". In Lewis G; Schrire B; MacKinder B; Lock M (eds.). Legumes of the world. Kew, UK: Royal Botanic Gardens. pp. 214–225. ISBN 1900347806.
  10. Lavin M; Herendeen PS; Wojciechowski MF (2005). "Evolutionary rates analysis of Leguminosae implicates a rapid diversification of lineages during the Tertiary". Syst Biol. 54 (4): 575–594. doi:10.1080/10635150590947131. PMID 16085576.
  11. LPWG [Legume Phylogeny Working Group] (2013). "Legume phylogeny and classification in the 21st century: progress, prospects and lessons for other species-rich clades" (PDF). Taxon. 62 (2): 217–248. doi:10.12705/622.8. hdl:10566/3455.
  12. Tucker SC (2003). "Floral ontogeny in Swartzia (Leguminosae: Papilionoideae: Swartzieae): Distribution and role of the ring meristem". Am J Bot. 90 (9): 1271–1292. doi:10.3732/ajb.90.9.1271. PMID 21659227.
  13. Ireland HE (2007). "Taxonomic changes in the South American genus Bocoa (Leguminosae–Swartzieae): Reinstatement of the name Trischidium, and a synopsis of both genera". Kew Bull. 62 (2): 333–350. JSTOR 20443359.
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