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Halophila johnsonii  Eiseman
Taxonomic Serial No.: 502870

(Download Help) Halophila johnsonii TSN 502870

 Taxonomy and Nomenclature
  Kingdom: Plantae  
  Taxonomic Rank: Species  
  Common Name(s): Johnson's seagrass [English]
  Accepted Name(s): Halophila ovalis (R. Br.) Hook. f.
  Taxonomic Status:    
  Current Standing: not accepted - synonym   
  Data Quality Indicators:    
  Record Credibility Rating: verified - standards met  

  Expert: Robert R. Haynes  
  Notes: Professor Emeritus, Department of Biological Sciences, The University of Alabama, Tuscaloosa, Alabama, 35476, USA   
  Reference for: Halophila johnsonii    
  Other Source(s):    
  Source: Hydrocharitaceae of North America Update, database (version 2010)  
  Acquired: 2010   
  Notes: Updated by the Flora of North America Expertise Network, in connection with an update for USDA PLANTS (2007-2010)   
  Reference for: Halophila johnsonii   
  Source: The PLANTS Database, database (version 4.0.4)  
  Acquired: 1996   
  Notes: National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA.   
  Reference for: Halophila johnsonii   
  Source: The PLANTS Database, database (version 5.1.1)  
  Acquired: 2000   
  Notes: National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA.   
  Reference for: Halophila johnsonii   
  Author(s)/Editor(s): National Oceanic and Atmospheric Administration  
  Publication Date: 1998   
  Article/Chapter Title: Endangered and Threatened Species; Threatened Status for Johnson's Seagrass   
  Journal/Book Name, Vol. No.: Federal Register, vol. 63, no. 177   
  Page(s): 49035-49041   
  Publication Place:    
  Reference for: Halophila johnsonii, Johnson's seagrass [English]   
  Author(s)/Editor(s): Short, Frederick T., Gregg E. Moore, and Kimberly A. Peyton  
  Publication Date: 2010   
  Article/Chapter Title: Halophila ovalis in the Tropical Atlantic Ocean   
  Journal/Book Name, Vol. No.: Aquatic Botany, vol. 93, no. 3   
  Page(s): 141-146   
  Publication Place:    
  ISBN/ISSN: 0304-3770   
  Notes: doi: 10.1016/j.aquabot.2010.05.001   
  Reference for: Halophila johnsonii   

 Geographic Information
  Geographic Division: North America  



  Comment: US ESA: Listed Threatened, as published in Federal Register Volume 63, Number 177, Pages 49035 - 49041, September 14, 1998  
    The recognition of H. johnsonii as a species remains controversial. Data in a recent paper by Short, Moore, and Peyton (2010) indicate that H. johnsonii Eisman (TSN 502870) is not clearly distinguishable from Halophila ovalis (R. Br.) Hook. f. (TSN 38959). Other recent papers using molecular techniques have also failed to clearly differentiate the species. Robert Haynes (2013, pers. comm.) who authored the treatment for the group in Flora of North America Vol. 22 (2000), which included the taxon as a distinct species, now concurs that H. johnsonii falls within H. ovalis. but notes that more research is needed to clarify relationships within this species complex, especially in the clade that includes H. ovalis, H. hawaiiana and the populations previously referred to as H. johnsonii  



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Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. However, it is not a legal authority for statutory or regulatory purposes. While every effort has been made to provide the most reliable and up-to-date information available, ultimate legal requirements with respect to species are contained in provisions of treaties to which the United States is a party, wildlife statutes, regulations, and any applicable notices that have been published in the Federal Register. For further information on U.S. legal requirements with respect to protected taxa, please contact the U.S. Fish and Wildlife Service.

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