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{{Short description|Genus of plants}}
{{taxobox
{{Speciesbox
|image = Lygodesmia spinosa.jpg
|image = Lygodesmia spinosa.jpg
|display_parents = 4
|regnum = [[Plantae]]
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|genus = Pleiacanthus
|unranked_divisio = [[Angiosperms]]
|parent_authority = (Nutt.) Rydb.
|unranked_classis = [[Eudicots]]
⚫
|species = spinosus
|unranked_ordo = [[Asterids]]
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|authority = ([[Thomas Nuttall|Nutt.]]) [[Per Axel Rydberg|Rydb.]]
|ordo = [[Asterales]]
|familia = [[Asteraceae]]
|tribus = [[Cichorieae]]
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|genus = '''''Pleiacanthus'''''
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|species = '''''P. spinosus'''''
|binomial = ''Pleiacanthus spinosus''
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|binomial_authority = ([[Thomas Nuttall|Nutt.]]) [[Per Axel Rydberg|Rydb.]]
|synonyms = ''Lygodesmia spinosa''<br>''Stephanomeria spinosa''
|synonyms = ''Lygodesmia spinosa''<br>''Stephanomeria spinosa''
|}}
}}

'''''Pleiacanthus''''' is a monotypic genus<ref>Lee, J., et al. (2002). [http://www.amjbot.org/cgi/content/full/89/1/160 Phylogeny of ''Stephanomeria'' and related genera (Compositae–Lactuceae) based on analysis of 18S–26S nuclear rDNA ITS and ETS sequences.] ''Am J Bot'' 89 160-8.</ref> of flowering plants in the [[Asteraceae|aster family]] containing the single species '''''Pleiacanthus spinosus''''' (formerly ''Stephanomeria spinosa''), which is known by the common name '''thorn skeletonweed''', or '''thorny skeletonweed'''. It is native to the western United States from [[Montana]] and [[Idaho]] to southern [[California]] and [[Arizona]], where it grows in many types of mostly dry habitat from deserts to mountains. It is a spindly [[shrub|subshrub]] producing several slender stems up to 40 or 50 centimeters tall from a woody [[caudex]]. The stems divide many times into short, rigid branches which narrow to sharp thorn-tips. The plant is mostly hairless except for brownish woolly tufts at the base and below the basal leaves. The leaves are small and linear on the lower stem, and reduced to scale-like growths on the upper branches. [[Head (botany)|Flower heads]] occur near the ends of the branches. Each has a cylindrical base wrapped in one layer of [[bract|phyllaries]]. The head contains 3 to 5 ray florets, each with an elongated tube and a pale to bright pink ligule. The fruit is an [[achene]] tipped with a cluster of [[pappus (flower structure)|pappus bristles]] which are not plumelike as are those of the ''[[Stephanomeria]]'' species with which this plant was once classified.
'''''Pleiacanthus''''' is a monotypic genus<ref>Lee, J., et al. (2002). [https://web.archive.org/web/20030801231843/http://www.amjbot.org/cgi/content/full/89/1/160 Phylogeny of ''Stephanomeria'' and related genera (Compositae–Lactuceae) based on analysis of 18S–26S nuclear rDNA ITS and ETS sequences.] ''Am J Bot'' 89 160-8.</ref> of flowering plants in the family [[Asteraceae]] containing the single species '''''Pleiacanthus spinosus''''' (formerly ''Stephanomeria spinosa''), which is known by the common name '''thorn skeletonweed''', or '''thorny skeletonweed'''. It is native to the western United States from [[Montana]] and [[Idaho]] to southern [[California]] and [[Arizona]], where it grows in many types of mostly dry habitat from deserts to mountains. It is a spindly [[shrub|subshrub]] producing several slender stems up to 40 or 50 centimeters tall from a woody [[caudex]]. The stems divide many times into short, rigid branches which narrow to sharp thorn-tips. The plant is mostly hairless except for brownish woolly tufts at the base and below the basal leaves. The leaves are small and linear on the lower stem, and reduced to scale-like growths on the upper branches. [[Head (botany)|Flower heads]] occur near the ends of the branches. Each has a cylindrical base wrapped in one layer of [[bract|phyllaries]]. The head contains 3 to 5 ray florets, each with an elongated tube and a pale to bright pink ligule. The fruit is an [[achene]] tipped with a cluster of [[pappus (flower structure)|pappus bristles]] which are not plumelike as are those of the ''[[Stephanomeria]]'' species with which this plant was once classified.

==References==
==References==
{{reflist}}
{{Reflist}}

==External links==
==External links==
*[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1868,1885 Jepson Manual Treatment]
*[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1868,1885 Jepson Manual Treatment]
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*[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067355 Flora of North America]
*[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067355 Flora of North America]
*[http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Pleiacanthus+spinosus Photo gallery]
*[http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Pleiacanthus+spinosus Photo gallery]

{{Taxonbar|from1=Q7164568|from2=Q16262918}}

[[Category:Cichorieae]]
[[Category:Cichorieae]]
[[Category:Monotypic plant genera]]
[[Category:Monotypic Asteraceae genera]]
[[Category:Flora of Arizona]]
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{{Cichorieae-stub}}
[[Category:Flora of California]]
[[Category:Flora of Idaho]]
[[Category:Flora of Montana]]



[[nv:Jádí nátʼoh]]
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{{Cichorieae-stub}}

Latest revision as of 09:14, 22 April 2024

Pleiacanthus
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Cichorioideae
Tribe: Cichorieae
Subtribe: Microseridinae
Genus: Pleiacanthus
(Nutt.) Rydb.
Species:
P. spinosus
Binomial name
Pleiacanthus spinosus
Synonyms

Lygodesmia spinosa
Stephanomeria spinosa

Pleiacanthus is a monotypic genus[1] of flowering plants in the family Asteraceae containing the single species Pleiacanthus spinosus (formerly Stephanomeria spinosa), which is known by the common name thorn skeletonweed, or thorny skeletonweed. It is native to the western United States from Montana and Idaho to southern California and Arizona, where it grows in many types of mostly dry habitat from deserts to mountains. It is a spindly subshrub producing several slender stems up to 40 or 50 centimeters tall from a woody caudex. The stems divide many times into short, rigid branches which narrow to sharp thorn-tips. The plant is mostly hairless except for brownish woolly tufts at the base and below the basal leaves. The leaves are small and linear on the lower stem, and reduced to scale-like growths on the upper branches. Flower heads occur near the ends of the branches. Each has a cylindrical base wrapped in one layer of phyllaries. The head contains 3 to 5 ray florets, each with an elongated tube and a pale to bright pink ligule. The fruit is an achene tipped with a cluster of pappus bristles which are not plumelike as are those of the Stephanomeria species with which this plant was once classified.

References

[edit]
  1. ^ Lee, J., et al. (2002). Phylogeny of Stephanomeria and related genera (Compositae–Lactuceae) based on analysis of 18S–26S nuclear rDNA ITS and ETS sequences. Am J Bot 89 160-8.
[edit]


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