Abstract
Plantago robusta is a critically endangered species endemic to Saint Helena Island, a remote British island located in the middle of the South Atlantic Ocean. Despite its already acknowledged considerable importance for biodiversity conservation, the species is notably poorly studied from a systematic point of view. In this work we typify the name P. robusta and present a complete account of the morphology of the species, including illustrations, field photographs and a complete description. Furthermore, we discuss important knowledge gaps concerning the species.
References
Barnéoud, F.-M. (1845) Monographie Générale de la Famille des Plantaginées. Fortin, Masson et C<sup>ie</sup>, Paris, 52 pp.
Beatson, A. (1816) Tracts Relative to the Island of St. Helena. W. Bulmer and Co., London, 330 pp.
<a href="https://doi.org/10.5962/bhl.title.28652">https://doi.org/10.5962/bhl.title.28652</a>
Chiovenda, E. (1903) Graminaceae. Flora della colonia Eritrea. Annuario del Reale Istituto Botanico di Roma 8: 21–70.
Cronk, Q.C.B. (1987) The history of endemic flora of St Helena: a relictual series. New Phytologist 105: 509–520.
<a href="https://doi.org/10.1111/j.1469-8137.1987.tb00888.x">https://doi.org/10.1111/j.1469-8137.1987.tb00888.x</a>
Cronk, Q.C.B. (1989) The past and present vegetation of St Helena. Journal of Biogeography 16: 47–64.
<a href="https://doi.org/10.2307/2845310">https://doi.org/10.2307/2845310</a>
Cronk, Q.C.B. (1995) William Roxburgh’s St Helena plants. Bulletin of the Natural History Museum of London 25: 95–98.
Cronk, Q.C.B. (2000) The Endemic Flora of St Helena. A. Nelson, Oswestry, 136 pp.
Decaisne, J. (1852) Plantaginaceæ. In: de Candolle, A.L.P.P. (Ed.) Prodromus Systematis Naturalis Regni Vegetabilis, vol. 13(1). V. Masson, Paris, pp. 693–737.
<a href="https://doi.org/10.5962/bhl.title.286">https://doi.org/10.5962/bhl.title.286</a>
Doweld, A.B. & Shipunov, A.B. (2017) (2497) Proposal to reject the name Plantago indica (Plantaginaceae). Taxon 66: 205–206.
<a href="https://doi.org/10.12705/661.25">https://doi.org/10.12705/661.25</a>
Ely, C.V., Bordignon, S.A.L., Trevisan, R. & Boldrini, I.I. (2017) Implications of poor taxonomy in conservation. Journal for Nature Conservation 36: 10–13.
<a href="https://doi.org/10.1016/j.jnc.2017.01.003">https://doi.org/10.1016/j.jnc.2017.01.003</a>
Gonçalves, S. & Romano, A. (2016) The medicinal potential of plants from the genus Plantago (Plantaginaceae). Industrial Crops and Products 83: 213–226.
<a href="https://doi.org/10.1016/j.indcrop.2015.12.038">https://doi.org/10.1016/j.indcrop.2015.12.038</a>
Guerrant Jr, E.O., Havens-Young, K. & Maunder, M. (Eds.) (2004) Ex Situ Plant Conservation–Supporting Species Survival in the Wild. Island Press, Washington, 536 pp.
Guerrant Jr., E.O. & Kaye, T.N. (2007) Reintroduction of rare and endangered plants: common factors, questions and approaches. Australian Journal of Botany 55: 362–370.
<a href="https://doi.org/10.1071/BT06033">https://doi.org/10.1071/BT06033</a>
Hassemer, G. & Rønsted, N.A.H. (2016) Yet another new species from one of the best-studied neotropical areas: Plantago humboldtiana (Plantaginaceae), an extremely narrow endemic new species from a waterfall in southern Brazil. PeerJ 4: e2050.
<a href="https://doi.org/10.7717/peerj.2050">https://doi.org/10.7717/peerj.2050</a>
Hassemer, G., De Giovanni, R. & Trevisan, R. (2016) The use of potential distribution models in the study of the distribution and conservation status of plants: the case of Plantago L. (Plantaginaceae) in Brazil. Journal of the Torrey Botanical Society 143: 38–49.
<a href="https://doi.org/10.3159/TORREY-D-14-00070">https://doi.org/10.3159/TORREY-D-14-00070</a>
Hassemer, G., Iamonico, D., Rønsted, N.A.H. & Di Pietro, R. (2017) Typification of the Linnaean names Plantago serraria and P. subulata (Plantago subgenus Coronopus, Plantaginaceae). Taxon 66: 738–741.
<a href="https://doi.org/10.12705/663.14">https://doi.org/10.12705/663.14</a>
Hassemer, G. (2018) Advances to the taxonomic knowledge of Plantago subulata (Plantago sect. Maritima, Plantaginaceae). Turkish Journal of Botany 42: 653–661.
<a href="https://doi.org/10.3906/bot-1801-51">https://doi.org/10.3906/bot-1801-51</a>
Hassemer, G., Shipunov, A.B., Rønsted, N.A.H. & Meudt, H.M. (2018) Taxonomic and geographic novelties in the genus Plantago (Plantaginaceae) in Chile, including the description of a new species. Phytotaxa 340 (2): 137–156.
<a href="https://doi.org/10.11646/phytotaxa.340.2.3">https://doi.org/10.11646/phytotaxa.340.2.3</a>
Hassemer, G. (2019a) Novelties and notes on Plantago sect. Virginica (Plantaginaceae), including the description of a new species and a revised identification key. Webbia 74: 29–41.
<a href="https://doi.org/10.1080/00837792.2019.1574114">https://doi.org/10.1080/00837792.2019.1574114</a>
Hassemer, G. (2019b) Mediterranean mysteries: notes on Plantago sect. Lancifolia (Plantaginaceae). Phytotaxa 423 (3): 111–128.
<a href="https://doi.org/10.11646/phytotaxa.423.3.1">https://doi.org/10.11646/phytotaxa.423.3.1</a>
Hassemer, G., Bruun-Lund, S., Shipunov, A.B., Briggs, B.G., Meudt, H.M. & Rønsted, N.A.H. (2019) The application of high-throughput sequencing for taxonomy: the case of Plantago subg. Plantago (Plantaginaceae). Molecular Phylogenetics and Evolution 138: 156–173.
<a href="https://doi.org/10.1016/j.ympev.2019.05.013">https://doi.org/10.1016/j.ympev.2019.05.013</a>
Hassemer, G. (2020) Plantago tomentosa (Plantaginaceae), not P. virginica naturalised in South Africa: first records of this species outside South America. South African Journal of Botany 131: 56–63.
<a href="https://doi.org/10.1016/j.sajb.2020.02.012">https://doi.org/10.1016/j.sajb.2020.02.012</a>
Hassemer, G., Prado, J. & Baldini, R.M. (2020) Diagnoses and descriptions in Plant Taxonomy: are we making proper use of them? Taxon 69: 1–4.
<a href="https://doi.org/10.1002/tax.12200">https://doi.org/10.1002/tax.12200</a>
Henn, J.G., Steffens, L., Sperotto, N.D.M., Ponce, B.S., Veríssimo, R.M., Boaretto, F.B.M., Hassemer, G., Péres, V.F., Schirmer, H., Picada, J.N., Saffi, J. & Moura, D.J. (2018) Toxicological evaluation of a standardized hydroethanolic extract from leaves of Plantago australis and its major compound, verbascoside. Journal of Ethnopharmacology 229: 145–156.
<a href="https://doi.org/10.1016/j.jep.2018.10.003">https://doi.org/10.1016/j.jep.2018.10.003</a>
Hoggard, R.K., Kores, P.J., Molvray, M., Hoggard, G.D. & Broughton, D.A. (2003) Molecular systematics and biogeography of the amphibious genus Littorella (Plantaginaceae). American Journal of Botany 90: 429–435.
<a href="https://doi.org/10.3732/ajb.90.3.429">https://doi.org/10.3732/ajb.90.3.429</a>
Höpke, J., Mucina, L. & Albach, D.C. (2019) Phylogenetic and morphometric analysis of Plantago section Coronopus (Plantaginaceae). Taxon 68: 315–339.
<a href="https://doi.org/10.1002/tax.12035">https://doi.org/10.1002/tax.12035</a>
Ishikawa, N., Yokoyama, J. & Tsukaya, H. (2009) Molecular evidence of reticulate evolution in the subgenus Plantago (Plantaginaceae). American Journal of Botany 96: 1627–1635.
<a href="https://doi.org/10.3732/ajb.0800400">https://doi.org/10.3732/ajb.0800400</a>
IUCN [International Union for Conservation of Nature] (2012) IUCN Red List Categories and Criteria. Version 3.1, 2<sup>nd</sup> ed. IUCN, Gland, 32 pp.
IUCN [International Union for Conservation of Nature] (2019) Guidelines for Using the IUCN Red List Categories and Criteria. Version 14. IUCN, Gland, 113 pp.
Iwanycki, N.E., Verstraete, B., Hassemer, G., Dunbar-Co, S., Hoggard, R., Meudt, H.M. & Rønsted, N.A.H. (2019) Ancestral range reconstruction of remote oceanic island species of Plantago (Plantaginaceae) reveals differing scales and modes of dispersal. Journal of Biogeography 46: 706–722.
<a href="https://doi.org/10.1111/jbi.13525">https://doi.org/10.1111/jbi.13525</a>
Kuntze, C.E.O. (1891) Revisio Generum Plantarum, vol. 2. A. Felix, Leipzig, pp. 377–1011.
<a href="https://doi.org/10.5962/bhl.title.327">https://doi.org/10.5962/bhl.title.327</a>
de Lamarck, J.-B.P.A.M. (1791) Tableau Encyclopédique et Méthodique des Trois Règnes de la Nature, Botanique, vol. 1. Panckoucke, Paris, 496 pp.
<a href="https://doi.org/10.5962/bhl.title.218">https://doi.org/10.5962/bhl.title.218</a>
de Lamarck, J.-B.P.A.M. & de Candolle, A.-P. (1805) Flore française, 3<sup>rd</sup> ed., vol. 3. H. Agasse, Paris, 731 pp.
Lambdon, P.W. & Darlow, A. (2008) Botanical Survey of Ascension Island and St Helena, 2008. A Report on the Current State of Plant Invasions, and their Implications for Conservation and Management. Royal Society for the Protection of Birds, Sandy, 78 pp.
Lambdon, P.W., Darlow, A., Clubbe, C. & Cope, T. (2013) Eragrostis episcopulus–a newly described grass species endemic to the island of St Helena, its ecology and conservation. Kew Bulletin 68: 121–131.
<a href="https://doi.org/10.1007/s12225-012-9413-1">https://doi.org/10.1007/s12225-012-9413-1</a>
Lambdon, P.W. & Ellick, S. (2016) Plantago robusta. In: The IUCN Red List of Threatened Species 2016: e.T67374369A67374372.
<a href="https://doi.org/10.2305/IUCN.UK.2016-1.RLTS.T67374369A67374372.en">https://doi.org/10.2305/IUCN.UK.2016-1.RLTS.T67374369A67374372.en</a>
Lasègue, A. (1845) Musée Botanique de M. Benjamin Delessert. Fortin, Masson et C<sup>ie</sup>, Paris, 588 pp.
<a href="https://doi.org/10.5962/bhl.title.134793">https://doi.org/10.5962/bhl.title.134793</a>
von Linné, C. (1753) Species Plantarum, vol. 1. L. Salvius, Stockholm, pp. 1–560.
<a href="https://doi.org/10.5962/bhl.title.669">https://doi.org/10.5962/bhl.title.669</a>
Melliss, J.C. (1875) St. Helena: a Physical, Historical, and Topographical Description of the Island. L. Reeve & Co., London, 426 pp.
Meudt, H.M. (2011) Amplified fragment length polymorphism data reveal a history of auto-and allopolyploidy in New Zealand endemic species of Plantago (Plantaginaceae): new perspectives on a taxonomically challenging group. International Journal of Plant Sciences 172: 220–237.
<a href="https://doi.org/10.1086/657657">https://doi.org/10.1086/657657</a>
Meudt, H.M. (2012) A taxonomic revision of native New Zealand Plantago (Plantaginaceae). New Zealand Journal of Botany 50: 101–178.
<a href="https://doi.org/10.1080/0028825x.2012.671179">https://doi.org/10.1080/0028825x.2012.671179</a>
Di Pietro, R. & Iamonico, D. (2014) Neotypification of the name Plantago alpina (Plantaginaceae). Taxon 63: 1347–1349.
<a href="https://doi.org/10.12705/636.5">https://doi.org/10.12705/636.5</a>
Pilger, R.K.F. (1937) Plantaginaceae. In: Engler, H.G.A. & Diels, F.L.E. (Eds.) Das Pflanzenreich, vol. 102. W. Engelmann, Leipzig, 466 pp.
Presl, C.B. (1836) Tentamen Pteridographiae. Typis Filiorum Theophili Haase, Prague, 290 pp., 12 plates.
<a href="https://doi.org/10.5962/bhl.title.630">https://doi.org/10.5962/bhl.title.630</a>
Raddi, G. (1820) Quaranta piante nuove del Brasile raccolte e descritte da Giuseppe Raddi. Memorie di Matematica e di Fisica della Società Italiana delle Scienze Residente in Modena 18 (Fisica): 382–414, 1 plate.
Rahn, K. (1974) Plantago section Virginica: a taxonomic revision of a group of American plantains using experimental, taximetric and classical methods. Dansk Botanisk Arkiv 30 (2): 1–180.
Rahn, K. (1978) Nomenclatural changes within the genus Plantago L., infraspecific taxa and subdivisions of the genus. Botanisk Tidsskrift 73: 106–111.
Rahn, K. (1992) Trichomes within the Plantaginaceae. Nordic Journal of Botany 12: 3–12.
<a href="https://doi.org/10.1111/j.1756-1051.1992.tb00195.x">https://doi.org/10.1111/j.1756-1051.1992.tb00195.x</a>
Rahn, K. (1996) A phylogenetic study of the Plantaginaceae. Botanical Journal of the Linnean Society 120: 145–198.
<a href="https://doi.org/10.1111/j.1095-8339.1996.tb00484.x">https://doi.org/10.1111/j.1095-8339.1996.tb00484.x</a>
Rønsted, N.A.H., Chase, M.W., Albach, D.C. & Bello, M.A. (2002) Phylogenetic relationships within Plantago (Plantaginaceae): evidence from nuclear ribosomal ITS and plastid trnL–F sequence data. Botanical Journal of the Linnean Society 139: 323–338.
<a href="https://doi.org/10.1046/j.1095-8339.2002.00070.x">https://doi.org/10.1046/j.1095-8339.2002.00070.x</a>
Samuelsen, A.B. (2000) The traditional uses, chemical constituents and biological activities of Plantago major L. A review. Journal of Ethnopharmacology 71: 1–21.
<a href="https://doi.org/10.1016/s0378-8741(00)00212-9">https://doi.org/10.1016/s0378-8741(00)00212-9</a>
Thomson, S.A., Pyle, R.L., Ahyong, S.T., Alonso-Zarazaga, M., Ammirati, J., Araya, J.F., Ascher, J.S., Audisio, T.L., Azevedo-Santos, V.M., Bailly, N., Baker, W.J., Balke, M., Barclay, M.V.L., Barrett, R.L., Benine, R.C., Bickerstaff, J.R.M., Bouchard, P., Bour, R., Bourgoin, T., Boyko, C.B., Breure, A.S.H., Brothers, D.J., Byng, J.W., Campbell, D., Ceríaco, L.M.P., Cernák, I., Cerretti, P., Chang, C.-H., Cho, S., Copus, J.M., Costello, M.J., Cseh, A., Csuzdi, C., Culham, A., D’Elía, G., d’Acoz, C.U., Daneliya, M.E., Dekker, R., Dickinson, E.C., Dickinson, T.A., van Dijk, P.P., Dijkstra, K.-D.B., Dima, B., Dmitriev, D.A., Duistermaat, L., Dumbacher, J.P., Eiserhardt, W.L., Ekrem, T., Evenhuis, N.L., Faille, A., Fernández-Triana, J.L., Fiesler, E., Fishbein, M., Fordham, B.G., Freitas, A.V.L., Friol, N.R., Fritz, U., Frøslev, T., Funk, V.A., Gaimari, S.D., Garbino, G.S.T., Garraffoni, A.R.S., Geml, J., Gill, A.C., Gray, A., Grazziotin, F.G., Greenslade, P., Gutiérrez, E.E., Harvey, M.S., Hazevoet, C.J., He, K., He, X., Helfer, S., Helgen, K.M., van Heteren, A.H., Garcia, F.H., Holstein, N., Horváth, M.K., Hovenkamp, P.H., Hwang, W.S., Hyvönen, J., Islam, M.B., Iverson, J.B., Ivie, M.A., Jaafar, Z., Jackson, M.D., Jayat, J.P., Johnson, N.F., Kaiser, H., Klitgård, B.B., Knapp, D.G., Kojima, J., Kõljalg, U., Kontschán, J., Krell, F.-T., Krisai-Greilhuber, I., Kullander, S., Latella, L., Lattke, J.E., Lencioni, V., Lewis, G.P., Lhano, M.G., Lujan, N.K., Luksenburg, J.A., Mariaux, J., Marinho-Filho, J., Marshall, C.J., Mate, J.F., McDonough, M.M., Michel, E., Miranda, V.F.O., Mitroiu, M.-D., Molinari, J., Monks, S., Moore, A.J., Moratelli, R., Murányi, D., Nakano, T., Nikolaeva, S., Noyes, J., Ohl, M., Oleas, N.H., Orrell, T., Páll-Gergely, B., Pape, T., Papp, V., Parenti, L.R., Patterson, D., Pavlinov, I.Y., Pine, R.H., Poczai, P., Prado, J., Prathapan, D., Rabeler, R.K., Randall, J.E., Rheindt, F.E., Rhodin, A.G.J., Rodríguez, S.M., Rogers, D.C., Roque, F.O., Rowe, K.C., Ruedas, L.A., Salazar-Bravo, J., Salvador, R.B., Sangster, G., Sarmiento, C.E., Schigel, D.S., Schmidt, S., Schueler, F.W., Segers, H., Snow, N., Souza-Dias, P.G.B., Stals, R., Stenroos, S., Stone, R.D., Sturm, C.F., Štys, P., Teta, P., Thomas, D.C., Timm, R.M., Tindall, B.J., Todd, J.A., Triebel, D., Valdecasas, A.G., Vizzini, A., Vorontsova, M.S., de Vos, J.M., Wagner, P., Watling, L., Weakley, A., Welter-Schultes, F., Whitmore, D., Wilding, N., Will, K., Williams, J., Wilson, K., Winston, J.E., Wüster, W., Yanega, D., Yeates, D.K., Zaher, H., Zhang, G., Zhang, Z.-Q. & Zhou, H.-Z. (2018) Taxonomy based on science is necessary for global conservation. PLoS Biology 16: e2005075.
<a href="https://doi.org/10.1371/journal.pbio.2005075">https://doi.org/10.1371/journal.pbio.2005075</a>
Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (Eds.) (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Koeltz Botanical Books, Glashütten, 254 pp.
<a href="https://doi.org/10.12705/Code.2018">https://doi.org/10.12705/Code.2018</a>
Turner, I.M. (2016) Notes relating to William Roxburgh’s study of the flora of St Helena. Kew Bulletin 71: 31.
<a href="https://doi.org/10.1007/s12225-016-9643-8">https://doi.org/10.1007/s12225-016-9643-8</a>
Turrill, W.B. (1948) On the flora of St. Helena. Kew Bulletin 3: 358–362.
<a href="https://doi.org/10.2307/4108840">https://doi.org/10.2307/4108840</a>
Walter, T. (1788) Flora Caroliniana. J. Fraser, London, 263 pp.
<a href="https://doi.org/10.5962/bhl.title.9458">https://doi.org/10.5962/bhl.title.9458</a>
Weryszko-Chmielewska, E., Matysik-Wo?niak, A., Sulborska, A. & Rejdak, R. (2012) Commercially important properties of plants of the genus Plantago. Acta Agrobotanica 65: 11–20.
<a href="https://doi.org/10.5586/aa.2012.038">https://doi.org/10.5586/aa.2012.038</a>