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This species is accepted, and its native range is SW. Arabian Peninsula.

[KBu]

Vollesen, K. (2007). Synopsis of the Species of Acanthus (Acanthaceae) in Tropical East and Northeast Africa and in Tropical Arabia. Kew Bulletin, 62(2), 233-249. Retrieved from http://www.jstor.org/stable/20443348

Conservation
The following citation from Wood (1997: 269) really cannot be bettered: "An unmistakable species whose thistle-like leaves are a feature of large areas of the escarpment and high plateau between 1000 and 3000 m. It is at its most frequent on the escarpment between 2000 and 2800 m where it is often dominant on steep eroded slopes .. It is also found on terrace walls, field borders and in a variety of waste places and is likely to become more frequent if the terrace system breaks down. It is unpalatable to grazing animals and vain attempts are made to control its spread by burning". Despite its limited total distribution this species cannot be considered as being under any sort of threat. Least concern (LC).
Distribution
Endemic to the Yemen Arab Republic.
Ecology
Montane bushland, now mostly degraded or secondary, old fields on terraces, roadsides, fences, steep rock faces; 1000 - 3000 m.
Note
There are two sheets in the Forsskal Herbarium in Copenhagen (C). One sheet is numbered 379 while the other sheet, originally from the Vahl Herbarium, is un-numbered. The two are very similar and could well be from the same plant. I have chosen the numbered sheet as the lectotype. The seeds from which the above cultivated specimen was grown were said to come from Qavtya (also spelled Qantya in some of the correspondence). The exact locality of this place has never been established. As mentioned in the conservation notes above, Acanthus arboreus easily adapts to disturbed vegetation and often colonises old fields and secondary vegetation and should not have any problems in co-existing with humans in this densely populated area.
Type
Yemen, Al Hadiyah & Kuisma, Forsskacl 379 (lectotype C!, chosen here; isolectotype BM!). A photograph of the lectotype is at K Cheilopsis arborea (Forssk.) Nees (1847: 272).

Native to:

Yemen

Acanthus arboreus Forssk. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Dawkins, H.C. [465], Uganda 13051.000
Troupin, G. [3207], Rwanda 13053.000
Dawkins, H.C. [466], Uganda 13055.000

First published in Fl. Aegypt.-Arab.: 115 (1775)

Accepted by

  • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 529. MIM, Deurne.
  • Wood, J.R.I. (1997). A handbook of the Yemen Flora: 1-434. Royal Botanic Gardens, Kew.

Literature

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Herbarium Catalogue Specimens

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
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Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0