Pyxidanthera Explained

Pyxidanthera is a genus of flowering plant in the family Diapensiaceae. Though often recongnized as two species, Pyxidanthera barbulata and Pyxidanthera brevifolia, these designations are not genetically or morphologically distinct.[1] [2] Furthermore, these two designated species were found to not be reciprocally monophyletic.[3] [4]

Despite these findings, some flora still recognize these two species based on their range, habitat, and leaf morphology (size andpubescence).[5] However, these leaf morphology differences are directly related to habitat and moisture.[6] Despite the species designations being based on habitat and moisture, climatic niche differentiation is not found between the two species.[7] Therefore, these species designations are strictly based on range, despite the overlapping range of the two species. The most widespread species, Pyxidanthera barbulata, is native to the eastern United States, occurring on the coast from Long Island to New Jersey and Virginia to South Carolina.[8] [9] A second species of Pyxidanthera[10] called Pyxidanthera brevifolia, known only from North and South Carolina.[11]

Notes and References

  1. Godt . MJW . Hamrick . J . Low levels of allozyme differentiation between Pyxidanthera (pyxie-moss) taxa (Diapensiaceae) . Plant Systematics and Evolution . 1995 . 195 . 3–4 . 159-168. 10.1007/BF00989292 . 1995PSyEv.195..159G .
  2. Wall . Wade A. . Douglas . Norman A. . Xiang . Qiu-Yun Jenny . Hoffmann . William A. . Wentworth . Thomas R. . Hohmann . Matthew G. . Evidence for range stasis during the latter Pleistocene for the Atlantic Coastal Plain endemic genus, Pyxidanthera Michaux: EVIDENCE FOR RANGE STASIS IN THE GENUS PYXIDANTHERA . Molecular Ecology . 6 September 2010 . 19 . 19 . 4302–4314 . 10.1111/j.1365-294X.2010.04793.x. 20819166 .
  3. Gaynor . Michelle L. . Fu . Chao-Nan . Gao . Lian-Ming . Lu . Li-Min . Soltis . Douglas E. . Soltis . Pamela S. . Biogeography and ecological niche evolution in Diapensiaceae inferred from phylogenetic analysis . Journal of Systematics and Evolution . September 2020 . 58 . 5 . 646–662 . 10.1111/jse.12646. free .
  4. Rönblom, K. and A. A. Anderberg. (2002). Phylogeny of Diapensiaceae based on molecular data and morphology. Systematic Botany 27(2) 383-95.
  5. Wells . B . A new pyxie from North Carolina. . Journal of the Elisha Mitchell Scientific Society . 1929 . 44 . 238–239.
  6. Primack RB . RB . Wyatt . R . Variation and taxonomy of Pyxidanthera (Diapensiaceae) . Brittonia . 1975 . 27 . 2 . 115-118. 10.2307/2805470 . 2805470 . 1975Britt..27..115P .
  7. Gaynor . Michelle L. . Fu . Chao-Nan . Gao . Lian-Ming . Lu . Li-Min . Soltis . Douglas E. . Soltis . Pamela S. . Biogeography and ecological niche evolution in Diapensiaceae inferred from phylogenetic analysis . Journal of Systematics and Evolution . September 2020 . 58 . 5 . 646–662 . 10.1111/jse.12646. free .
  8. http://www.natureserve.org/explorer/servlet/NatureServe?searchName=Pyxidanthera+barbulata Pyxidanthera barbulata.
  9. http://www.centerforplantconservation.org/Collection/CPC_ViewProfile.asp?CPCNum=7047 Pyxidanthera barbulata.
  10. http://www.theplantlist.org/1.1/browse/A/Diapensiaceae/Pyxidanthera/ The Plant List
  11. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250092267 Pyxidanthera brevifolia.

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