Research Article |
Corresponding author: Karol Marhold ( karol.marhold@savba.sk ) Academic editor: Peter de Lange
© 2016 Karol Marhold, Marek Šlenker, Hiroshi Kudoh, Judita Zozomová-Lihová.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Marhold K, Šlenker M, Kudoh H, Zozomová-Lihová J (2016) Cardamine occulta, the correct species name for invasive Asian plants previously classified as C. flexuosa, and its occurrence in Europe. PhytoKeys 62: 57-72. https://doi.org/10.3897/phytokeys.62.7865
|
The nomenclature of Eastern Asian populations traditionally assigned to Cardamine flexuosa has remained unresolved since 2006, when they were found to be distinct from the European species C. flexuosa. Apart from the informal designation “Asian C. flexuosa”, this taxon has also been reported under the names C. flexuosa subsp. debilis or C. hamiltonii. Here we determine its correct species name to be C. occulta and present a nomenclatural survey of all relevant species names. A lectotype and epitype for C. occulta and a neotype for the illegitimate name C. debilis (replaced by C. flexuosa subsp. debilis and C. hamiltonii) are designated here. Cardamine occulta is a polyploid weed that most likely originated in Eastern Asia, but it has also been introduced to other continents, including Europe. Here data is presented on the first records of this invasive species in European countries. The first known record for Europe was made in Spain in 1993, and since then its occurrence has been reported from a number of European countries and regions as growing in irrigated anthropogenic habitats, such as paddy fields or flower beds, and exceptionally also in natural communities such as lake shores.
Asian Cardamine flexuosa, Brassicaceae , Cardamine flexuosa subsp. debilis , Cardamine hamiltonii , Cardamine occulta , China, Cruciferae, Europe, invasive species, typification
Cardamine flexuosa (Cruciferae) was described by
It was not until the phylogenetic paper by
Morphological characters of Eastern Asian populations treated as C. flexuosa and their differences from European populations are presented by a number of authors (e.g.,
As a consequence, based on their genetic divergence, different ploidy, allopolyploid origins, morphology, ecological requirements and distribution patterns, we are of the opinion that European and Eastern Asian populations previously treated as C. flexuosa should be classified as two different taxa at the species level. The concept of two taxa is also adopted in the Flora of North America (
None of the above-mentioned names were properly typified or used unequivocally, which necessitated a thorough search for the correct species-level name for “Asian Cardamine flexuosa”. Here we present a nomenclatural survey of all relevant names and highlight the increasing number of records of “Asian Cardamine flexuosa” across Europe.
For the purpose of typifying names, herbarium specimens, especially types and authentic collections, were searched for in relevant herbaria (B,
The type status of species names corresponding to “Asian C. flexuosa” in the sense of
Cardamine occulta Hornem., Suppl. Hort. Bot. Hafn.: 71. 1819 (urn:lsid:ipni.org:names:280533-1:1.2) ≡ Cardamine flexuosa var. occulta (Hornem.) O.E.Schulz, Bot. Jahrb. Syst. 32: 479 (1903) (http://biodiversitylibrary.org/page/185332). Described from: “Hab. in China. C. intr. 1817”. Lectotype (designated here, or perhaps holotype): Cardamine occulta mihi, sponte provenit in terra e China al[l]ata, ex h. b. Hafn. Hornemann s.n. – C! (ex herb. Hornemann, C10021749). Epitype (designated here): China, Zhejiang Province, Linhai County, Kuocang Mountains (括苍山), ditch along the road, 28°50.35'N; 120°58.90'E, 79 m, 18 April 2014, K. Marhold CH18/12/2014, Yunpeng Zhao 赵云鹏, & Ming Jiang 蒋明 –
There is a single specimen available in herbarium C originating from Hornemann’s collection that undoubtedly represents the single remnant of the original material for the name C. occulta. As
= Cardamine debilis D. Don, Prodr. Fl. Nepal. 201. 1825 [26 Jan-1 Feb 1825], (urn:lsid:ipni.org:names:280260-1:1.3; http://biodiversitylibrary.org/page/393098), nom illeg., non Banks ex DC. Syst. Nat. 2: 265. 1821 [late May 1821] (urn:lsid:ipni.org:names:280259-1:1.4; http://biodiversitylibrary.org/page/39512107). Described from: “Hab. in Nepaliâ ad Narainhetty. Hamilton.” Neotype (designated here): [India, West Bengal] Botanical Garden Darjeeling, weed, 18. 6. 1959, Lövkvist C-336-3 –
The name C. debilis D. Don is based on data in the manuscript of Francis Buchanan-Hamilton (referred to as “Hamilton MSS”;
= Cardamine brachycarpa Franch., Bull. Soc. Bot. France 26: 83. 1879, nom. illeg. (urn:lsid:ipni.org:names:280196-1:1.4; http://biodiversitylibrary.org/page/260368), non Opiz, Naturalientausch 11: 411. 1826 (urn:lsid:ipni.org:names:280195-1:1.3). Described from: [JAPAN] “Insul. Nippon, prov. Etchigo, circa Niigata, secus vias humidas (R. P. Faurie)”. Lectotype (designated by
= Cardamine arisanensis Hayata, Icon. Pl. Formosan. 3: 20. 1913 [25 Dec 1913] (urn:lsid:ipni.org:names:280161-1:1.3). Described from: “In Monte Morrison, ad 10000-11000 ped. alt., leg. T.Kawakami et U.Mori, 1906, Oct. (No.2252); in Montibus Centralibus, Feb. 1908”. Lectotype (
= Cardamine autumnalis Koidz. Bot. Mag. (Tokyo) 43: 404. 1929 (urn:lsid:ipni.org:names:280169-1:1.3) – Described from: “Nippon: Yokosuka (1g. Wichura, Oct. 18, 1860) Mus. Bot. Berol.-Dahlem”. Holotype: “Japan, Jokohama, 19. [sic!] 10. 1860, [M. E.] Wichura 1064 [1069?]” B! (B 10 0241388 [http://herbarium.bgbm.org/object/B100241388]).
The species C. autumnalis was described with a reference to “Cardamine flexuosa ssp. debilis Schultz (pro. parte) in Engl. Bot. Jahrb. 32. (1903) s. 479, (quoad specim. ex Yokoska)”. Indeed, there is a specimen marked “Japonia: … pr. Jokohama leg. Wichura 1860” referred to by
The usual life cycle of C. occulta in Eastern Asian rice fields includes flowering in early spring before rice is planted and the fields are flooded by water. Nevertheless, there are also exceptions such as the nomenclatural type of the name C. autumnalis, which represents an autumn-flowering plant of C. occulta.
‒ Cardamine aff. flexuosa sensu I. Thomps., Flora of Victoria 3: 434–442. 1996.
There are two other names at the species level that are potentially applicable to “Asian C. flexuosa”, namely:
Cardamine nasturtioides D.Don, Prodr. Fl. Nepal.: 201. 1825. [26 Jan-1 Feb 1825] (urn:lsid:ipni.org:names:280509-1:1.3; http://biodiversitylibrary.org/page/393098) – Described from: “Hab. in Nepaliâ. Hamilton.”
Cardamine decurrens (Blume) Zoll. et Moritzi in Moritzi, Syst. Verz.: 35. 1846 (urn:lsid:ipni.org:names:280262-1:1.3.2.2; http://reader.digitale-sammlungen.de/de/fs1/object/display/bsb10302557_00051.html) ≡ Pteroneurum decurrens Blume, Bijdr. Fl. Ned. Ind. 2: 51. 1825 [12 Jun-2 Jul 1825] (urn:lsid:ipni.org:names:288262-1:1.1.2.2.1.2; http://biodiversitylibrary.org/page/428177). – Described from: “in altis paludosis montis Burangrang Provinciae Krawang.”
The location of the original material of these two names is as yet unknown, and it remains to be ascertained whether they are synonyms of C. occulta or represent other taxa. In any case, both these names are later than C. occulta, which has priority among all species names applicable to “Asian C. flexuosa”.
The name C. zollingeri Turcz. was sometimes considered to be a synonym of C. flexuosa in a wide sense (e.g.,
Cardamine zollingeri Turcz., Bull. Soc. Imp. Naturalistes Moscou 27(2): 294. 1854 (urn:lsid:ipni.org:names:280762-1:1.3) ≡ Nasturtium obliquum Zoll. & Moritzi, Natuur- Geneesk. Arch. Ned.-Indië 2: 580. 1845 (urn:lsid:ipni.org:names:287528-1:1.4; https://archive.org/stream/natuurengeneesku02bata#page/580/mode/2up) – Described from: “[Java] Nasturtium obliquum Z. et M. Herb. N. 2211 … Legi in arenosis et glareosis vulcanicis ad fluviorum ripas e. g. prope Trawas prov. Modjokerto VIII.1844. p. m. 3000’ s. m.” Lectotype (designated here): [INDONESIA, Java], “Planta Javanica a cl. Zolliger lecta no. 2211” Zollinger 2211
Cardamine occulta most likely originated in Eastern Asia. It is unclear whether it naturally occurs or ever occurred in any natural plant community. The localities that we know from Japan and Eastern China and which are referred to on herbarium specimens represent solely man-made habitats, most often rice paddies, orchards or various other kinds of synanthropic vegetation. This is why we (
As stated above,
When
First records of Cardamine occulta Hornem. for European countries and their administrative divisions (if multiple records for a given region are dated to the same time, one representative is chosen). Information in square brackets was derived by the authors of the present paper. The records were reported under (1) Cardamine flexuosa auct. non With. (Asian C. flexuosa), (2) Cardamine flexuosa auct. non With., (3) Cardamine flexuosa subsp. debilis O.E. Schulz, (4) Cardamine hamiltonii G. Don, and (5) Cardamine occulta Hornem.
Country | Admin. division | Year | Locality | Reported by (Reported as) |
---|---|---|---|---|
Austria | Vorarlberg | 2007 | Lake Constance, [Bregenz, shore of the lake, 47°30'N; 9°44'E], 2007 |
|
Austria | Upper Austria | 2009 | Schärding, Stadtplatz square, in flower pots and between cobblestones (7546/2), ca. 320 m, [48°27.41'N; 13°25.9'E], 7.6.2009, M. Hohla ( |
|
Austria | Salzburg | 2013 | Salzburg City, Liefering, Oberer Bonau-weg Street, in the nursery as a weed, ca. 410 m (8144/3) [47°49.38'N; 13°0.78'E], 23.8.2013, P. Pilsl (Herbarium Pilsl), conf. M. Hohla | Hohla 2015 (4) |
Austria | Styria | 2014 | Graz, Jakominiplatz square, in flower beds (8958/2), [47°4.05'N; 15°26.5'E], 27. 09. 2014, M. Hohla ( |
|
Austria | Vienna | 2015 | Vienna, West Railway station (Westbahnhof), ca. 210 m, (7864/1) [48°11.53'N; 16°18.76'E], 8.12.2015, M. Hohla ( |
Hohla 2015 (4) |
Belgium | 2007 | Antwerp, Mol, [Lostraat st., cemetery], 51°12.05'N; 5°12.78'E, 29. 03. 2007, R. Barendse (observation) | http://waarnemingen.be/waarneming/view/45438666 (4) | |
France | Midi-Pyrénées | 2014 | Toulouse, [Square Charles de Gaulle square], urban vegetation, 43°36.28'N; 1°26.7'E, 12. 04. 2014, E. Slootweg (observation) | http://observation.org/waarneming/view/83277183 (4) |
Germany | Baden-Württemberg | 2004 | Lake Constance, Reichenau, Reichenauer Damm dam, [47°41.2'N; 9°6'E], spring 2004, W. Ostendorp, M. Dienst & E. Klein |
|
Germany | Bavaria | 2007 | Lake Constance, [Wasserburg, shore of lake, 47°34'N; 9°38'E], 2007 |
|
Germany | North Rhine-Westphalia | 2014 | Aachen, Soers, Garden Center (5202/21), [50°46'N; 6°5'E], 14. 03. 2014, F. W. Bomble & S. Bomble |
|
Greece | 2014 | Crete, Nomos of Iraklion, Eparchia of Temenos, 1821 Street, near entrance of the “El Greco Hotel”, edge of flower bed with a cultivated tree, 35°20.28'N; 25°7.96'E, 17. 06. 2014, N. M. G. Ardenghi & P. Cauzzi ( |
|
|
Italy | Piedmont | 2003 | Prov. Vercelli, Arborio [45°29.6'N; 8°24'E], 25. 08. 2003, M. Desfayes ( |
M. Desfayes, unpubl. data |
Italy | Sardinia | 2010 | Cagliari, near the building of the Department of Botany at Viale Sant’Ignazio da Laconi, 56 m, 39°13.3'N; 9°6.7'E, 03. 2012, V. Lazzeri |
|
Italy | Lombardy | 2013 | Pavia, Piazzale della Stazione square, public flowerbed, 45°11.3'N; 9°8.68'E, 11.12.2013, N. M. G. Ardenghi ( |
|
Italy | Tuscany | 2013 | Florence, W side of Piazza di Santa Maria Novella square, public flower bed, 43°46.41'N; 11°14.94'E, 09. 12. 2013, N. M. G. Ardenghi & S. Mossini ( |
|
Italy | Trentino-South Tirol | 2015 | Trento, Corso del Lavoro e della Scienza, 191 m, [46° 3.57'N; 11°6.95'E], 20. 11. 2015, V. Lazzeri ( |
|
Italy | Veneto | 2015 | Venice, [Campo San Maurizio], 45°25.97'N; 12°19.90'E, 11. 09. 2015, W. Meijer (observation) | http://observation.org/waarneming/view/110617765 (4) |
Slovakia | 2014 | Bratislava, Brnianska street, flower pot with a shrub at restaurant Patrónsky pivovar, 320 m, 48°9.96'N; 17°4.84'E, 10. 06. 2014, K. Marhold ( |
K. Marhold, unpubl. data | |
Spain | Valencia, Alicante | 1993 | San Vicente del Raspeig, Partida Canastell, flower pot, (UTM 30SYH1455), 170 m, [38°24'N; 0°32'W], J.C. Cristóbal ( |
|
Spain | Canary Islands, Tenerife | 2010 | Bajamar, TF-13 road, close to Barranco Perdomo, Pelargonium plantation in roundabout, [28°32.8'N; 16°20.9'W], 15. 09. 2010, F. Verloove 8433 ( |
|
Spain | Andalusia, Huelva | 2010 | Nuevo Portil, golf course (UTM 29SPB7220), [37°12.8'N; 7°4'W], 11. 08. 2010, E. Sánchez Gullón (priv. herb. ESG 263; dupl. |
|
Spain | Canary Islands, Gran Canaria | 2011 | San Agustin, Las Burras, close to the beach, irrigated lawn, [27°46.1'N; 15°32.5'W], 06. 11. 2011, F. Verloove 9215 ( |
|
Spain | Cantabria | 2011 | San Vicente de la Barquera, 43°22.9'N; 4°23.9'W, 09. 06. 2011, M. Lysák ( |
M. Lysák, unpubl. data |
Spain | Valencia | 2014 | Valencia, Quart de Poblet, Mas de les Fites, 96 m, gardens of Centro para la Investigación y Experimentación Forestal de la Generalitat Valenciana (UTM 30SYJ134726) [39°28.44'N; 0°31.25'W], 19. 08. 2014, C.J. Mansanet, P.P. Ferrer & E. Laguna ( |
|
Switzerland | Schaffhausen | 2007 | Lake Constance, [Stein am Rhein, shore of lake, 47°39.4'N; 8°52'E], 2007 |
|
Switzerland | St. Gallen | 2007 | Lake Constance, [Staad, shore of the lake, 47°29'N; 9°32'E], 2007 |
|
Switzerland | Thurgau | 2007 | Lake Constance, [Salmsach, shore of the lake, 47°33'N; 9°22.8'E], 2007 |
|
Switzerland | Bern | 2014 | Bern, 598751/199269, flower pots, [46°56'N; 7°27'E], 2014 |
|
Switzerland | Schwyz | 2014 | Lachen, 707088/227808, between cobblestone, 2014, [47°11'N; 8°51'E], 2014 |
|
Switzerland | Vaud | 2014 | Lausanne, Av. de Florimont, 538763/152550, between paving stones, [46°30.9'N; 6°38.3'E], 2014 |
|
Switzerland | Zürich | 2014 | Zürich, 681596/248874, gravel, [47°22'N; 8°32'E], 2014 |
|
The Netherlands | 2009 | North Brabant, Eindhoven, [51°26'N; 5°28'E], 2009, R. Barendse |
|
The third spot in Europe where C. occulta was reported from are the shores of Lake Constance (Bodensee) in Germany. In spring 2004, an unknown Cardamine species was detected there at the Reichenau dam (observed by W. Ostendorp, M. Dienst and E. Klein;
Cardamine occulta was later reported also from continental Spain, the Canary Islands, France, parts of Germany, Switzerland and Austria other than the shores of Lake Constance, from Belgium, the Netherlands, Slovakia, and Crete (Table
For most of the countries and administrative divisions presented in Table
It is apparent that, unlike European C. flexuosa, C. occulta represents an invasive species that is quickly spreading from its area of origin in Eastern Asia to other continents. The characteristics of seed dormancy and germination of C. occulta are likely to enhance its invasiveness, especially in wet and occasionally submerged habitats. It has been reported that seeds of C. occulta can survive both in dry and submerged conditions for more than three months (
This work was supported by the Czech Science Foundation (P506/12/0668 to K.M.). The authors thank Dušan Senko, Bratislava for his help with the map and two reviewers for their constructive comments.