Abstract
A taxonomic revision of the Asian species of Stuckenia, a segregate of Potamogeton, is presented. Six species are recognized and their morphological descriptions, nomenclature and typification of relevant names are given. Distributions of all species are described and lists of representative specimens and distribution maps provided. Lectotypes are designated for 24 names and nomenclatural types are listed for 22 additional names. The correct name for the species known as Potamogeton recurvatus is Stuckenia pamirica (Baagöe) Z. Kaplan, comb. nova. Morphological variation at different levels within the genus is described and compared with different concepts of its taxonomic interpretation. Instructions on examination of key characters are given, together with a key to species. Colour photographs illustrate the general appearance of species as well as many identification details. The pattern of variation and taxonomic validity of the Siberian morphotypes S. subretusa and S. austrosibirica are analyzed. The plasticity of diagnostic characters of P. juncifolius and of P. helveticus from the European Alps, the infraspecific classification of S. filiformis in North America, and the taxonomic status of S. punensis described from Peru are also discussed.
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Notes
The name P. borealis Raf. was proposed for the name “P. marinum L. ?” misapplied by Michaux (1803). Since St. John (1916) it has been believed that the name refers to a form of S. filiformis. However, the type consists of two fruiting plants that with their open sheaths and big fruits undoubtedly belong to S. pectinata, not to S. filiformis.
Type citation given in the protologue: “in Regni Mexicani regione temperata, aquia innatans lacus Yurirapundari, in convalli Sancti Jacobi, inter Puert de Andaracuas et Valladolid de Mechoacan, alt. 914 hexap., Humb. et Bonpl.”
Type citation given in the protologue: “in Provincia Caracasana in lacu Tacariguæ prope urbem Novæ Valenciæ, alt. 226 hex., Humb. et Bonpl.”
When published by Hagström (1916), the name P. pectinatus var. diffusus included several previously published names and by this also their types. According to the present rules, the name has to be considered superfluos and illegitimate. The following three name are the earliest of those included, all with equal priority: P. pectinatus var. dichotomus Wallr. 1822, var. protensus Wallr. 1822, and var. scoparius Wallr. 1822. Among them the nomenclatural base for P. pectinatus var. diffusus has to be chosen. Wiegleb and Kaplan (1998) selected the most frequently adopted name of the three, var. scoparius.
The type was cited in the prologogue as “Muntjokk-ott 23 juni Mapiek-köll”. The reference was later (Ostenfeld and Paulsen 1922) refined as “East Turkestan, Mapik-köll, a part of Kara-koshun, 816 m, 23rd June 1900” and the voucher indicated to be preserved in “hb. Stockholm Univ.” (Hagström 1916). I was unable to locate any specimen identified as var. coronatus or from this place in the herbarium S in spite of twice searching through all collections. Also I failed to find a corresponding specimen in the separately kept collection of specimens from later Hedin travels (S-Hedin) or in Hagström’s personal herbarium now preserved in LD.
The protologue of P. pectinatus var. ungulatus included the earlier name P. pectinatus var. coronatus Hagstr.
The protologue of Potamogeton intramongolicus (Ma et al. 1983) included also the name P. acifolius, obviously referring to the same species. It appears that the author while writing the paper changed his mind, abandoned the epithet “acifolius” and intended to replace it by “intramongolicus” (or vice versa). Unfortunatelly, he failed to correct the name throughtout the protologue. Thus, the name P. intramongolicus appears in the paper on pages 2, 3 and 8, whereas the name P. acifolius is given for the same species on pages 10, 11, 16 and 17 (there is also identical species number 10 often given in front of these two names). By this unfortunate mistake, he created alternative names according to the Code (Vienna ICBN Art. 32.2; McNeill et al. 2006) and none of them is validly published.
Tzvelev (1999) intended to transfer Potamogeton intramongolicus into the genus Stuckenia. However, he actually did not produce the proposed combination “Stuckenia intramongolica (Ma) Tzvelev” because the intended basionym was invalid. In spite of this, Tzvelev created a new name, because he cited in the synonymy Potamogeton chakassiensis and thus he made a full and direct reference to an effectively published description (Vienna ICBN Art. 32.5; McNeill et al. 2006) and to the corresponding type (Art. 10.3). The new name should be attributed solely to the validating author, Tzvelev. Nevertheless, because P. chakassiensis is validly published and legitimate name, epithet “chakassiensis” should have been adopted on the species level (Art. 52.1). The name S. intramongolica is therefore nomenclaturally superfluous when published and is ilegitimate according to the rules.
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Acknowledgements
I would like to thank the curators of the above-mentioned institutional herbaria as well as Leoš Klimeš, Bernhard Dickoré and Victor V. Chepinoga who allowed me to study their collections. Victor V. Chepinoga also kindly provided me with recent fresh plant material and Kateřina Jandová helped to take care of the cultivated samples. James L. Reveal, John McNeill and Karol Marhold provided useful comments on intricate nomenclatural issues and Tony Dixon improved the English of the manuscript. The research was supported by grant 206/06/0593 from the Grant Agency of the Czech Republic, and by the long-term institutional research plan no. AV0Z60050516 from the Academy of Sciences of the Czech Republic. The visits to the collections and libraries of the Botanical Museum of the University of Copenhagen, the Naturhistorisches Museum Wien, the Royal Botanic Garden Edinburgh and the Nationaal Herbarium Nederland in Leiden and Wageningen were supported by the European Commission’s Integrated Infrastructure Initiative programme SYNTHESYS.
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Dedicated to the memory of Leoš Klimeš (1960–2007) who disappeared during his last expedition to Ladakh.
Appendix
Appendix
Index of scientific names.
Only final epithets are included in the index. Nomenclatural synonyms with the same final epithet are represented by their basionym only. Epithets of correct names of accepted species are printed in bold.
Generic names
Coleogeton 160, 170
Groenlandia 160
Potamogeton 159–162, 166, 229
Stuckenia 159–163, 166–170, 180, 188, 190, 201, 206, 227–229
Zannichellia 162
Supraspecific names in Potamogeton
Coleogeton 160, 170
Coleophylli 160
Pectinati 160
Specific and infraspecific names in Potamogeton
acifolius 177
alpinus 218
amblyphyllus 209
amphibius 219
angustissimus 174
aulacophyllus 218
austrosibiricus 220, 227
balatonicus 177, 188
borealis 172
caespitosus 175
chakassiensis 179, 180
coronatus 176
dichotomus 174, 175
diffusus 175
elongatus 219
fasciculatus 218
filiformis 201, 218, 228
flabellatus 175
fluviatilis 219
foliosus 175
gracilis 177
helveticus 159, 176, 177, 188
humilis 220
interruptus 172, 174
intramongolicus 177, 180
juncifolius 159, 164, 219, 227
kihlmanii 219
latifolius 174
macrocarpus 189
magellanicus 220, 227
marinus 172
mongolicus 175, 176
occidentalis 227
pamiricus 194, 200, 201
pectinatus 170, 171, 206
protensus 174, 175
punensis 220, 228
recurvatus 159, 194, 201
rostratus 220
scoparius 174, 175
setaceus 218
subdrupaceus 176
subretusus 202, 206
tenuifolius 174
tenuior 180
tenuis 175
typicus (under P. pectinatus) 172
ungulatus 176
vaginatus 201
vaillantii 174
vulgaris (under P. filiformis) 218
vulgaris (under P. pectinatus) 172
zosteraceus 175, 188, 189
zosteroides 176
Specific and infraspecific names in Stuckenia
alpina 218, 228
amblyphylla 161, 168–170, 206, 209–217
austrosibirica 159, 220, 227
borealis 172
fennica 228
filiformis 159, 161–170, 172, 201, 206, 216, 218, 221–223, 225–228
helvetica 177
intramongolica 180
macrocarpa 161, 168, 169, 171, 189–195
marina 172
occidentalis 228
pamirica 159, 161, 168, 171, 194, 195, 197–201
pectinata 160–163, 166–173, 178, 179, 186, 188–190, 206, 207, 225, 227, 228
punensis 159, 220, 228
striata 160
subretusa 159, 202, 206–208
vaginata 161, 168, 171, 188, 201, 203–208, 228
zosteracea 175
Specific and infraspecific names in other genera
Buccaferrea pectinata 172
Coleogeton * alpinus 218
Coleogeton * balatonicus 177
Coleogeton filiformis 218
Coleogeton pectinatus 172
Coleogeton vaginatus 202
Spirillus filiformis 218
Spirillus interruptus 172
Spirillus pectiniformis 172
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Kaplan, Z. A Taxonomic Revision of Stuckenia (Potamogetonaceae) in Asia, with Notes on the Diversity and Variation of the Genus on a Worldwide Scale. Folia Geobot 43, 159–234 (2008). https://doi.org/10.1007/s12224-008-9010-0
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DOI: https://doi.org/10.1007/s12224-008-9010-0