Haworthiopsis nigra: Difference between revisions

Haworthiopsis nigra
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Asphodelaceae
Subfamily:	Asphodeloideae
Genus:	Haworthia
Species:	H. nigra
Binomial name
	Haworthia nigra;

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Revision as of 20:21, 15 January 2015

Haworthia nigra is a species of flowering succulent plant from the Western and Eastern Cape Provinces, South Africa.

Description and taxonomy

H.nigra grows its leaves in three tiers. The leaves, which are a very dark green to brownish black, are covered in dark tubercles, and are packed densely along its stems.

Within the genus Haworthia, the species forms part of the subgenus Hexangulares. More specifically, it falls within section Trifariae ("Three-tiered") together with its close relative Haworthia viscosa (and its other relatives Haworthia sordida, Haworthia scabra and Haworthia starkiana).

Recent phylogenetic studies have demonstrated that subgenus Hexangulares is actually relatively unrelated to other Haworthias (being more closely related to Gasterias. It will therefore comprise a new, separate genus, Haworthiopsis, and this species will accordingly become "Haworthiopsis nigra".^[1]^[2]

References

^ Manning, John; Boatwright, James S.; Daru, Barnabas H.; Maurin, Olivier; van der Bank, Michelle. A Molecular Phylogeny and Generic Classification of Asphodelaceae subfamily Alooideae: A Final Resolution of the Prickly Issue of Polyphyly in the Alooids? Systematic Botany, Volume 39, Number 1, March 2014, pp. 55-74
^ http://www.haworthia.org.uk/haworthia.htm

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[1] Manning, John; Boatwright, James S.; Daru, Barnabas H.; Maurin, Olivier; van der Bank, Michelle. A Molecular Phylogeny and Generic Classification of Asphodelaceae subfamily Alooideae: A Final Resolution of the Prickly Issue of Polyphyly in the Alooids? Systematic Botany, Volume 39, Number 1, March 2014, pp. 55-74

[2] ttp://www.haworthia.org.uk/haworthia.htm

[1]

[2]

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 |image = Haworthia nigra - leaf detail 8.jpg
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-'''''Haworthia nigra''''' is a species of flowering succulent plant from the [[Eastern Cape]] Province, [[South Africa]].
+'''''Haworthia nigra''''' is a species of flowering succulent plant from the [[Western Cape|Western]] and [[Eastern Cape]] Provinces, [[South Africa]].
-==Description==
+==Description and taxonomy==
-''H.nigra'' grows in clumps in its natural habitat, with its stems packed with robust succulent leaves. It is normally dark green but sometimes acquires a rich purple-red when in full sunlight.
+''H.nigra'' grows its leaves in three tiers. The leaves, which are a very dark green to brownish black, are covered in dark tubercles, and are packed densely along its stems.
+Within the genus ''[[Haworthia]]'', the species forms part of the [[subgenus]] ''Hexangulares''. More specifically, it falls within [[Section (botany)|section]] ''Trifariae'' ("Three-tiered") together with its close relative ''[[Haworthia viscosa]]'' (and its other relatives ''[[Haworthia sordida]]'', ''[[Haworthia scabra]]'' and ''[[Haworthia starkiana]]'').
+Recent [[phylogenetic]] studies have demonstrated that subgenus ''Hexangulares'' is actually relatively unrelated to other Haworthias (being more closely related to ''[[Gasteria]]s''. It will therefore comprise a new, separate genus, ''[[Haworthiopsis]]'', and this species will accordingly become ''"Haworthiopsis nigra"''.<ref>Manning, John; Boatwright, James S.; Daru, Barnabas H.; Maurin, Olivier; van der Bank, Michelle. A Molecular Phylogeny and Generic Classification of Asphodelaceae subfamily Alooideae: A Final Resolution of the Prickly Issue of Polyphyly in the Alooids? Systematic Botany, Volume 39, Number 1, March 2014, pp. 55-74</ref><ref>http://www.haworthia.org.uk/haworthia.htm</ref>