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New Combinations in the Vascular Flora of Finland, in the Genera Spinulum, Oxybasis and Potentilla

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New Combinations in the Vascular Flora of Finland, in the Genera Spinulum, Oxybasis and Potentilla 36Memoranda Soc. Fauna Flora Fennica 95:Kurtto 36–39. & Uotila 2019 • Memoranda Soc. Fauna FloraISSN Fennica 0373-6873 95, (print) 2019 Helsinki 19 February 2019 ISSN 1796-9816 (online) New combinations in the vascular flora of Finland, in the genera Spinulum, Oxybasis and Potentilla Arto Kurtto & Pertti Uotila Kurtto, A., Botanical Museum, Finnish Museum of Natural History, P.O.Box 7, FI­00014 University of Helsinki. E­mail [email protected] Uotila, P., Botanical Museum, Finnish Museum of Natural History, P.O.Box 7, FI­00014 University of Helsinki. E­mail [email protected] In the course of compiling an updated checklist of vascular plants of Finland, a few cases were revealed where nomenclatural changes proved necessary. Four new nomenclatural combinations are proposed: Spinulum annotinum (L.) A. Haines subsp. alpestre (Hartm.) Uotila (Lycopodiace- ae), Oxybasis salina (Standl.) Uotila (Chenopodiaceae), Potentilla neglecta Baumg. var. acutifida (Markl.) Kurtto (Rosaceae) and Potentilla neglecta var. decora (Markl.) Kurtto (Rosaceae). Introduction Spinulum annotinum A checklist of the vascular plants of Finland was Recently, an attempt at a consensus classifica- published over 30 years ago (Kurtto & Lahti tion of lycophytes and ferns down to genus lev- 1987). Later it was updated to some extent (in- el has been proposed by The Pteridophyte Phy- digenous plants, established aliens and most com- logeny Group (2016). This classification will be mon casuals) in the Field Flora of Finland (most followed in the new checklist of Finnish plants. recent, 4th edition, Hämet-Ahti & al. 1998) and In the new classification a narrower generic its updates (Hämet-Ahti & al. 2005a,b), as well as concept is often adopted, which means, for in- in the annually published Atlas of Finnish vascu- stance, the splitting of the wide Linnaean genus lar plants (most recent version, Lampinen & Lah- Lycopodium into several small genera. The taxa ti 2018). In addition to the Floras and Atlas, the with unbranched upright shoots were separat- checklist is urgently needed for the Finnish Bio­ ed into a new genus Spinulum A. Haines. Only diversity Information Facility (FinBIF), main- three species, the widespread S. annotinum (L.) tained by the Finnish Museum of Natural History A. Haines and S. canadense (Nessel) A. Haines, Luomus. Currently, an updated checklist of Finn- as well as the North-East Asiatic S. subarcticum ish vascular plants, with all native and alien (nat- (V. N. Vassil.) A. Haines were originally accepted uralized and casual) plants, is under preparation. (Haines 2003); recently a fourth taxon, S. lioui Li Several new nomenclatural combinations are re- Bing Zhang & H. He from China, has been added quired for the checklist, usually as a result of re- (Chen & al. 2017). However, a wide hybrid zone cently changed taxonomic insights. occurs where S. annotinum and S. canadense Memoranda Soc. Fauna Flora Fennica 95, 2019 • Kurtto & Uotila 37 meet, and recently, the latter was not accepted but genus Oxybasis Fuentes, Uotila & Borsch in- S. annotinum was treated collectively in Labrador cluded five species, and after later transfers the and Newfoundland (Meades & Brouillet 2019). number of accepted species has been raised to 11 The widespread Northern Hemisphere lyco- (Sukhorukov & Uotila 2013, Sukhorukov 2014, phytes, Diphasiastrum complanatum (L.) Holub, Mosyakin & De Lange 2018). The most problem- Huperzia selago (L.) Bernh. ex Schrank & Mart., atic taxon is Oxybasis glauca, which had been Lycopodium clavatum L. and Spinulum annoti­ traditionally divided into several both morpho- num, each have a more or less distinct south – logically and geographically quite well-defined north pattern of morphological variation, result- races or species. Clemants & Mosyakin (2003) ing in morphologically recognized northern rac- treated the North American taxon as Chenopo­ es. They have been accepted taxonomically as dium glaucum var. salinum and Verloove (2013) varieties, subspecies or species; recently often transferred it to Oxybasis ‘for convenience’ as a as species (e.g., Haines 2011, Elven 2011+). In variety, even though he pointed out its distinct- North Europe the distinctness of the variation ness from var. glauca. However, later Mosyak- differs between the genera, but all these taxa are in (2013) accepted the subspecific level, as pro- connected to the corresponding southern races by posed by Aellen (1929), and moved it to Oxyba­ frequent intermediates. Consequently, the races sis. Recently, Mosyakin & De Langhe (2018) el- have been treated mostly as subspecies in North evated to species rank three of the taxa of the ag- Europe (e.g., Kukkonen 2000) and the subspecies gregate, earlier treated as subspecies, but they did rank seems most appropriate pending further re- not deal with O. glauca subsp. salina. Because search. The new subspecific combination need- of morphological differences and geographically ed for the northern race of S. annotinum is pro- relatively well-delimited areas in North America posed here. and fairly easily recognizable introduced plants in Europe, Uotila (2001, 2005) accepted specific Spinulum annotinum (L.) A. Haines subsp. rank for the North American member of the Che­ alpestre (Hartm.) Uotila, comb. nov. nopodium glaucum group in North European flo- Basionym: Lycopodium annotinum L. var. alpestre Hartm., ras. Accordingly, the following new nomenclatu- Handb. Skand. Fl., ed. 2: 294. 1832. ≡ Lycopodium ral combination at species rank is proposed. annotinum subsp. alpestre (Hartm.) Á. Löve & D. Löve in Nucleus (Calcutta) 1(1): 7. 1958. Oxybasis salina (Standl.) Uotila, comb. nov. = Lycopodium annotinum var. pungens Bach. Pyl. ex Basionym: Chenopodium salinum Standl., N. Amer. Fl. Desv. in Mém. Soc. Linn. Paris 6(2): 182. 1827, nom. 21/1: 29. 1916. ≡ Chenopodium glaucum L. subsp. inval. ≡ Lycopodium annotinum var. pungens Desv. ex salinum (Standl.) Aellen in Repert. Spec. Nov. Regni Spring in Nouv. Mém. Acad. Roy. Sci. Bruxelles 15 Veg. 26: 46. 1929. ≡ Chenopodium glaucum var. sa­ (Lyc. Monogr. pt. 1): 78. 1842. ≡ Lycopodium pun­ linum (Standl.) B. Boivin in Canad. Field-Naturalist gens (Desv. ex Spring) Iljin in Izvestiya Glavnogo Bo- 65: 17. 1951. ≡ Oxybasis glauca (L.) S. Fuentes, Uo- tanicheskogo Sada 22(2): 2. 1923. ≡ Lycopodium an­ tila & Borsch var. salina (Standl.) Verloove in New J. notinum subsp. pungens (Desv. ex Spring) Hultén in Bot. 3(1): 59. 2013. ≡ Oxybasis glauca subsp. salina Ark. Bot. n.s., 7(1): 7. 1968, comb. inval. (Standl.) Mosyakin in Phytoneuron 2013–56: 5. 2013. = Lycopodium canadense Romhild ex Nessel, Bärlapp- gewächse 284. 1939, nom. inval. ≡ Lycopodium canadense Nessel in Rev. Sudam. Bot. 6: 169. 1940. ≡ Potentilla neglecta Spinulum canadense (Nessel) A. Haines, Fam. Huper- ziac. Lycopodiac. New England: 86. 2003. The partly apomictic (pseudogamous) and poly- ploid so-called Potentilla argentea group is no- torious for its extraordinary taxonomic difficul- ties. The group has been treated in widely diver- Oxybasis salina gent ways by different authors, ranging from the Fuentes-Bazan & al. (2012) re-defined the Lin- recognition of two or three distinct species pos- naean genus Chenopodium (Chenopodiaceae) sibly with few to many varieties or subspecies to and divided it into several segregate genera. The the acceptance of numerous species or only a sin- 38 Kurtto & Uotila • Memoranda Soc. Fauna Flora Fennica 95, 2019 gle broadly circumscribed species (for details, see Potentilla neglecta Baumg. var. acutifida Kurtto & al. 2004). Gunnar Marklund, a Finnish (Markl.) Kurtto, comb. nov. botanist better known as an expert on the Ranun­ Basionym: Potentilla impolita Wahlenb. subsp. acutifida culus auricomus complex and Taraxacum, was Markl. in Memoranda Soc. Fauna Fl. Fenn. 16: 56. among the first to consider the group to consist of 1940. ≡ Potentilla acutifida (Markl.) A. Pedersen in three species, viz. the diploid (2n = 14) Potentil­ Urt 21: 130. 1997. ≡ Potentilla argentea L. var. acuti­ la argentea L. (s. str.), the hexaploid (2n = 42) ”P. fida (Markl.) Karlsson in Svensk Bot. Tidskr. 91(5): impolita Wahlenb.” (= P. neglecta Baumg.) and 249. 1998 [1997 publ. 1998]. P. calabra Ten. (Marklund 1933), of which the last-mentioned has since been shown also to be Potentilla neglecta Baumg. var. decora (Markl.) diploid. However, later he published (Marklund Kurtto, comb. nov. 1940) two new taxa (”Sippen”) of the group at Basionym: Potentilla decora Markl. in Memoranda Soc. different ranks, viz. P. impolita subsp. acutifida Fauna Fl. Fenn. 16: 55. 1940. ≡ Potentilla argentea L. and P. decora, of which he regarded the first-men- var. decora (Markl.) Karlsson in Svensk Bot. Tidskr. tioned as closely related (”nahe verwandt”) to P. 91(5): 249. 1998 [1997 publ. 1998]. impolita (sensu Markl.) and the latter as signif- icantly more (”beträchtlich stärker”) deviating from it. Acknowledgements. We thank Teuvo Ahti and Alexander N. Sennikov (both in Helsinki) for help in nomenclature In Norden, the Potentilla argentea group has and Geoffrey Harper (Hereford) for linguistic revision of recently been treated mainly in two ways. Peder- the text. sen & Schou (1997) and, following them, Hämet- Ahti & al. (1998), recognized six species in Nor- den, apparently following the narrow species concept generally applied in the likewise partly References apomictic and polyploid P. collina group. For his Aellen, P. 1929: Beitrag zur Systematik der Chenopo- part, Karlsson (1998) preferred to treat the same dium-Arten
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