''Hydrothrix''
Hook.f.
Sir Joseph Dalton Hooker (30 June 1817 – 10 December 1911) was a British botanist and explorer in the 19th century. He was a founder of geographical botany and Charles Darwin's closest friend. For twenty years he served as director of ...
was previously a
monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...
flowering plant
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...
of
Pontederiaceae
Pontederiaceae is a family of flowering plants.
The APG IV system of 2016 (unchanged from the APG III system of 2009, the APG II system of 2003 and the APG system of 1998) places the family in the order Commelinales, in the commelinid clade, ...
, but is currently included in a broader and
monophyletic ''
Heteranthera''.
The highly modified ''Heteranthera gardneri'' is a submerged aquatic with a two-flowered
pseudanthium
A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...
found in eastern Brazil. It is used as an
aquarium plant.
References
External links
*
''Hydrothrix'' on keys.lucidcentral.org
Monotypic Commelinales genera
Pontederiaceae
Flora of Brazil
{{Commelinales-stub