About: Halophila johnsonii

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Halophila johnsonii, or Johnson's seagrass, is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed.

Attributes	Values
rdf:type	Thing Eukaryote Embryophyte eukaryote species plant umbel-rc:Plant
rdfs:label	Halophila johnsonii (en)
rdfs:comment	Halophila johnsonii, or Johnson's seagrass, is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed. (en)
foaf:name	Johnson's seagrass (en)
name	Johnson's seagrass (en)
foaf:depiction
dcterms:subject	Halophila Endemic flora of Florida
Wikipage page ID	12937900 (xsd:integer)
Wikipage revision ID	1058944484 (xsd:integer)
Link from a Wikipage to another Wikipage	Biscayne Bay Halophila Plantae Angiosperms Halophila Endemic flora of Florida Dredging Alismatales Florida West Indian manatee Green sea turtle Herbivorous Hydrocharitaceae Turbidity National Oceanic and Atmospheric Administration Seagrass Sebastian Inlet Eutrophication Thermal pollution Monocots
Link from a Wikipage to an external page	http://www.nmfs.noaa.gov/pr/species/plants/johnsonsseagrass.htm
sameAs	Halophila johnsonii Halophila johnsonii Halophila johnsonii Halophila johnsonii
dbp:wikiPageUsesTemplate	dbt:Italic_title dbt:Reflist dbt:Short_description dbt:Taxobox dbt:Taxonbar dbt:Wikispecies
thumbnail	wiki-commons:Special:FilePath/Johnsons_seagrass.jpg?width=300
binomial	Halophila johnsonii (en)
binomial authority	Eiseman and McMillan (en)
familia	Hydrocharitaceae
genus	Halophila (en)
image caption	Closeup of a bed of Johnson's seagrass (en)
ordo	Alismatales
regnum	Plantae
species	H. johnsonii (en)
status	G2 (en)
status system	TNC (en)
unranked classis	Monocots
unranked divisio	Angiosperms
has abstract	Halophila johnsonii, or Johnson's seagrass, is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed. It may have the most limited distribution of all seagrasses. It occurs only in lagoons along roughly 200 km of the Florida coastline between Sebastian Inlet and the northern part of Biscayne Bay, where it grows in small patches of a few centimeters to a few meters in diameter at depths ranging from the intertidal zone down to 3 meters. Prior to 1980, the species designation was uncertain. It was sometimes referred to as either Halophila decipiens or H. baillonis Ascherson, despite most closely resembling H. ovalis. Morphologically, Johnson's seagrass is recognized by the presence of pairs of linearly shaped foliage leaves, each with a petiole formed on the node of a horizontally creeping rhizome. The rhizome is located at or just below the sediment surface and is anchored to unconsolidated substrate by unbranched roots. The leaves are generally 2-5 cm long (including the petioles), and the rhizome internodes rarely exceed 3-5 cm in length, making this species appear diminutive relative to the larger seagrasses. Both the Green sea turtle and the West Indian manatee are known to feed upon the plant, as well as some herbivorous fish. However, the main threat to species survival is probably human activity. Processes that threaten the plant include eutrophication, dredging, turbidity, and thermal pollution. (en)
gold:hypernym	Seagrass
prov:wasDerivedFrom	wikipedia-en:Halophila_johnsonii?oldid=1058944484&ns=0
page length (characters) of wiki page	3504 (xsd:nonNegativeInteger)
conservation status	G2
conservation status system	TNC
class	Monocots
division	Angiosperms
family	Hydrocharitaceae
genus	Halophila
kingdom	Plantae
order (taxonomy)	Alismatales
foaf:isPrimaryTopicOf	wikipedia-en:Halophila_johnsonii
is Link from a Wikipage to another Wikipage of	List of endangered plants in North America Biscayne National Park List of least concern plants Halophila Halophila decipiens Halophila engelmannii Marine conservation Johnson's Seagrass Johnson's sea grass Johnson's seagrass
is Wikipage redirect of	Johnson's Seagrass Johnson's sea grass Johnson's seagrass
is foaf:primaryTopic of	wikipedia-en:Halophila_johnsonii

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