Two New Combinations in Stuckenia, the Correct Name for Coleogeton (Potamogetonaceae)

Abstract

Coleogeton and Stuckenia are based on the same type species. Stuckenia has priority over Coleogeton, making Coleogeton superfluous. All necessary new combinations for taxa that occur in North America are proposed for use in the Flora of North America. These combinations include S. filfonnrmis subsp. alpina and S. filformis subsp. occidentalis. Les and Haynes (1996) elevated Potamogeton L. subg. Coleogeton Reichenbach to generic status, assigning the name Coleogeton (Reichenbach) Les & Haynes to it. They chose C. pectinatus (L.) Les & Haynes (basionym: P pectinatus L.) as the type species and made all combinations that were necessary for use in Flora of North America. Shortly after the article appeared, one of us (Krdl), in a letter addressed to Les, pointed out that Br6mer (1912a) had elevated the subgenus to the generic level and had given it the generic name Stuckenia Bomer. After examining the protologue of Stuckenia, Les and Haynes determined that to be correct. Similarly, Bomrner (1912a) selected P pectinatus as the type species. Consequently, the generic name Coleogeton is superfluous. Bomer did not make the combination S. pectinata at that time, but did formally make it later that year (Bmrner, 1912b). Holub (1984, 1997) subsequently made all relevant combinations at the species level. He did not, however, make any combinations at the infraspecific levels. This publication makes the necessary infraspecific combinations of Stuckenia for use in Flora of North America. See Les and Haynes (1996) for relevant discussions, typification, and synonymy. The sequence of names mirrors that in Les and Haynes (1996). 1. Stuckenia striata (H. Rufz & J. Pav6n) J. Holub, Preslia 69: 364. 1997. 2. Stuckenia pectinata (L.) C. B&rner, F1. Deutsche Volk 713. 1912. 3. Stuckenia filiformis (C. H. Persoon) C. Borner, F1. Deutsche Volk 713. 1992. 3a. Stuckenia filiformis (C. H. Persoon) C. Borner subsp. alpina (Blytt) R. R. Haynes, D. H. Les & M. Kril, comb. nov. Basionym: Potamogeton marinus f. alpinus Blytt, Norges Flora 1: 370. 1861. 3b. Stuckenia filiformis (C. H. Persoon) C. Borner subsp. occidentalis (J. W. Robbins) R. R. Haynes, D. H. Les & M. Kr6l, comb. nov. Basionym: Potamogeton marinus L. var. (?) occidentalis J. W. Robbins, in S. Watson, Bot. King's Explor. 339. 1871. 4. Stuckenia vaginata (N. Turczaninow) J. Holub, Folia Geobotanica et Phytotaxonomica, Praha 19: 215. 1984. Acknowledgments. We thank W. D. Stevens, of the Missouri Botanical Garden, for helping us obtain the original literature of Stuckenia.