Summary
Pteronia L. is a southern African endemic genus, mostly diversified in the Greater Cape Floristic Region. The genus was identified as one of the taxonomic priorities in South Africa. This study presents a taxonomic treatment of an informal morphological group: the Pteronia uncinata group. Five species are here recognised (P. diosmifolia Brusse, P. fasciculata L.f., P. paniculata Thunb., P. teretifolia (Thunb.) Fourc. and P. uncinata DC.). They are readily distinguished from congeners by the densely clustered terminal capitula often arranged in a compound corymb. Taxonomic descriptions, diagnostic characteristics, geographical distributions and ecological information, as well as an identification key to the five species recognised within the P. uncinata group are provided. Pteronia trigona E.Phillips had, until now, been considered a synonym of P. teretifolia but differs from the latter species (and the other species within the P. uncinata group) by the solitary, sessile capitula. As a result, Pteronia trigona is here resurrected for a taxon from the Eastern Cape, South Africa. Although P. trigona is not considered to form part of the P. uncinata group, a taxonomic description to clarify its identity is provided and the nomenclature, distribution and ecology for this species provided.
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References
Bello, A. O. (2018). A systematic study of Pteronia L. (Asteraceae). Unpubl. PhD thesis, Faculty of Sciences, University of Johannesburg, South Africa.
____, Boatwright, J. S., Tilney, P. M., van der Bank, M. & Magee, A. R. (2017). A taxonomic revision of the Pteronia camphorata group (Astereae, Asteraceae). S. African J. Bot. 113: 277 – 287.
____, ____, van der Bank, M. & Magee, A. R. (2020). Four new species of Pteronia (Astereae, Asteraceae) from South Africa. Phytotaxa 430 (1): 25 – 32.
Brusse, F. A. (1990). A new species of Pteronia L. (Asteraceae) from the limestone areas of the Southwestern Cape, South Africa. Bull. Jard. Bot. Natl. Belg. 60: 151 – 154.
Candolle, A. P. de (1836). Prodromus Systematis Naturalis Regni Vegetabilis, Pars Quinta. Treuttel & Würtz, Paris. [Pteronia on pp. 356 – 365].
Compton, R. H. (1931). The flora of the Whitehill district. Trans. Roy. Soc. South Africa 19: 313 – 315.
Coovadia, Z. H. (2007). The antimicrobial properties and chemical composition of leaf extracts and essential oils of indigenous Pteronia species. Unpubl. MSc thesis, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
Dinter, K. (1931). Kurzer Bericht über meine Reise 1929 in die Küstenwüste southwest Afrikas, spez. Die Buchuberg. Repert. Spec. Nov. Regni Veg. 29: 163 – 170.
Edwards, D. & Leistner, O. A. (1971). A degree reference system for citing biological records in southern Africa. Mitt. Bot. Staatssamml. München 10: 501 – 509.
Fourcade, H. G. (1932). Contributions to the flora of the Knysna and neighbouring Divisions. Trans. Roy. Soc. South Africa 21: 75 – 102.
Gibbs Russell, G. E., Welman, W. G. M., Retief, E., Immelman, K. L., Germishuizen, G., Pienaar, B. J., Van Wyk, M. & Nicholas, A. (1987). List of species of southern African plants. Mem. Bot. Surv. South Africa 2 (1 – 2): 1 – 152 (pt. 1), 1 – 270 (pt. 2).
Goswami, S. (2013). System of plant classification: 3 types. Biology Discussion. http://www.biologydiscussion.com/plants/classifications/system-of-plant-classification-3-types/30330. [Accessed 30 July 2016].
Harvey, W. H. (1865). Compositae. In: W. H. Harvey & O. W. Sonder (eds), Flora Capensis Vol. 3, [Pteronia on pp. 95 – 111]. Hodges, Smith and Co., Dublin.
Herman, P. P. J. (2003). Pteronia. In: G. Germishuizen & N. L. Meyer (eds), Plants of southern Africa: an annotated checklist. Strelitzia 14: 276 – 279.
____, Victor, J. E. & Turner, R. C. (2006). Pteronia diosmifolia Brusse. National Assessment: Red List of South African Plants version 2020.1. [Accessed 20 Jan. 2021].
Heydenrych, B. (1994). Limestone fynbos: unique but threatened. An investigation into the conservation status of limestone fynbos in the southern Cape. Flora Conservation Committee Report 94. Botanical Society of South Africa, Kirstenbosch.
Hulley, I. M., Viljoen, A. M., Tilney, P. M., Van Vuuren, S. F., Kamatou, G. P. P. & Van Wyk, B-E. (2010). Ethnobotany, leaf anatomy, essential oil composition and antibacterial activity of Pteronia onobromoides (Asteraceae). S. African J. Bot. 76: 43 – 48.
____, ____, ____, ____, ____ & ____ (2011). Pteronia divaricata (Asteraceae): A newly recorded Cape herbal medicine. S. African J. Bot. 77: 66 – 74.
Hutchinson, J. & Phillips, E. P. (1917). A revision of the genus Pteronia (Compositae). Ann. S. African Mus. 9: 277 – 329.
Kolberg, H. & Van Slageren, M. (2014). A synopsis of the genus Pteronia (Compositae: Astereae) in Namibia including the resurrection of Pteronia quadrifaria. Kew Bull. 69: 1 – 44.
Leistner, O. A. & Morris, J. M. (1976). Southern African place names. Ann. Cape Prov. Mus. 12.
Lessing, C. F. (1832). Sysnopsis Generum Compositarum Earumque Dispositionis Novae Tentamen Monographiis Multarum Capensium Interjectis. Sumtibus Dunckeri et Humblotii, Berolini. [Pteronia on pp. 195 – 196].
Linnaeus, C. (filius) (1782). Supplementum Plantarum. Impensis Orphanotrophei, Brunsvigæ.
____ (1796). Syngenesia polygamia æqualis. Systema Vegetabilium 1161 – 1208.
Manning, J. C. & Goldblatt. P. (2012). Plants of the Greater Cape Floristic Region 1: the Core Cape flora. Strelitzia 29. South African National Biodiversity Institute, Pretoria.
Merxmüller, H. (1967). Asteraceae. In: H. Merxmüller (ed.), Prodromus einer Flora von Südwestafrika 139: 150 – 159. J. Cramer, Lehre.
____ & Roessler, H. (1984). Compositen-Studien XI. Neue Übersicht der Compositen Südwestafrikas. Mitt. Bot. Staatssamml. München 20: 61 – 96.
Poiret, J. L. M. (1804). Encyclopedie Methodique Botanique 5: 730 – 734. Agasse, Paris.
Raimondo, D., Von Staden, L., Foden, W., Victor, J. E., Helme, N. A., Turner, R. C., Kamundi, D. A. & Manyama, P. A. (2009). Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
SANBI (2020). Red List of South African Plants version 2020.1. http://redlist.sanbi.org/genus.php?genus=3222. [Accessed 10 Feb. 2021].
Saupe, S. G. (2007). Phenetic classification systems. http://employees.csbsju.edu/ssaupe/biol308/Lecture/Classification/phenetic_class.htm. [Accessed 30 July 2016].
Shearing, D. (1997). Karoo. South African Wild Flower Guide 6. Botanical Society of South Africa, Kirstenbosch, Claremont.
Snijman, D. A. (ed.). (2013). Plants of the Greater Cape Floristic Region, Vol. 2: the Extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.
Sprengel, C. (1826). Classis XIX. Syngenesia. Systema Vegetabilium 3: 353 – 674. sumtibus Librariae Dieterichianae, Gottingae.
Stafleu, F. A. & Cowan, R. S. (1976). Taxonomic literature: A selective guide to botanical publications and collections with dates, commentaries, and types. Volume I: A – G, 2nd ed. p. 433. Bohn, Scheltema & Holkema, Utrecht.
____ & ____ (1979). Taxonomic literature: A selective guide to botanical publications and collections with dates, commentaries, and types. Volume II: H – Le,2nd ed. p. 378. Bohn, Scheltema & Holkema, Utrecht; Dr. W. Junk b.v., Publishers, The Hague.
Thiers, B. (2021, continuously updated). Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden's Virtual Herbarium. http://sweetgum.nybg.org/science/ih/ [Accessed 6 March 2021].
Thunberg, C. P. (1800). Prodromus Plantarum Capensium, quas, in Promontorio Bonæ Spei Africes, annis 1772 – 1775. Pars posterior, pp. 143 – 144. Joh. Fr. Edman, Uppsala.
____ (1823). Flora capensis: Sistens Plantas Promontorii Bonae Spei Africes, secundum systema sexuale emendatum, redactas ad classes, ordines, genera et species, cum differentiis specificis, synonymis et descriptionibus, pp. 629 – 634. Sumtibus J. G. Cottae, Stuttgardtiae.
Victor, J. E. (2002). South Africa. In: J. S. Golding (ed.), Southern African plant Red Data Lists, pp. 93 – 120. Southern African Botanical Diversity Network Report 14, SABONET, Pretoria.
____ & Smith, G. F. (2011). The conservation imperative and setting plant taxonomic research priorities in South Africa. Biodivers. & Conservation 20: 1501 – 1505. https://doi.org/10.1007/s10531-011-0041-0
____, Hamer, M. & Smith, G. F. (2013). A Biosystematics Research Strategy for the Algae, Animals, Bacteria and Archaea, Fungi and Plants of South Africa 2013 – 2018. SANBI Biodiversity Series 23. South African National Biodiversity Institute, Pretoria.
Viljoen, A. M., Kamatou, G. P. P., Coovadia, Z. H., Özek, T. & Başer, K. H. C. (2010). Rare sesquiterpenes from South African Pteronia species. S. African J. Bot. 76: 146 – 152.
Vlok, J. & Schutte-Vlok, A. L. (2010). Plants of the Klein Karoo. Tien Wah Press, Singapore.
Von Staden, L., Raimondo, D. & Dayaram, A. (2013). Taxonomic research priorities for the conservation of the South African flora. S. African J. Sci. 109: 1 – 10. https://doi.org/10.1590/sajs.2013/1182.
Walpers, G. G. (1843). Repertorium Botanices Systematicae 2. sumtibus Friderici Hofmeister, Lipsiae.
Acknowledgements
The authors wish to acknowledge the curators and staff of BOL, JRAU, NBG, PRE and SAM for general advice and assistance; Cape Nature for issuing collecting permits; Felix Riegel, Kooscl, Nicola van Berkel and Sally Adam (iNaturalist.org) for the digital photos; the University of Johannesburg, National Research Foundation, South African National Biodiversity Institute and University of the Western Cape for funding. The authors are grateful to the reviewers for the invaluable suggestions and improvement on the manuscript.
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Bello, A.O., Boatwright, J.S., van der Bank, M. et al. Taxonomic revision of the Pteronia uncinata group (Asteraceae: Astereae) and the resurrection of Pteronia trigona. Kew Bull 77, 271–292 (2022). https://doi.org/10.1007/s12225-022-10004-9
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DOI: https://doi.org/10.1007/s12225-022-10004-9