| Potamogeton perfoliatus subsp. perfoliatus | |
| Publ. & Syn. | L., Sp. Pl.: 126 (1753). Lectotype (LAPP): Sweden: "Lapland". Linnaean Lapland Herbarium 69 (Haynes 1985: 178). |
| Notes | In Norway, Potamogeton perfoliatus approaches the Arctic but does not reach it. |
| Chromosomes | (1) 26 (2x). - Far East (N). - Probatova and Sokolovskaya (1984c). (2) ca. 40. - Far East (N). - Probatova and Sokolovskaya (1984c). See note. (3) ca. 48. - Europe (C). - Wisniewska (1931); Tischler (1934). See note. (4) 52 (4x). - Europe. - Several reports. (5) 78 (6x). - Europe (N), Far East (N). - Arohonka (1982); Probatova and Sokolovskaya (1986). The reports of 2n = ca. 40 and ca. 48 may be of aneuploid, inexact counts, or the ca. 40 may represent a triploid (2n = 39). The reports of hexaploids (2n = 78) are reliable, so there are at least two ploidy levels, probably three. Not included: An old report of 2n = 14 (n = 7) from Japan (Takusagawa 1939). |
| Geography | European - Asian: ICE RUS SIB GRL. |
| Distribution | N = F Ic = r E = S YG = r FN = b UN = s YK = r GE = r Tm = r KP = s [ key ] |
| Parent taxon | Potamogeton perfoliatus L. |
| PAF ID | 240105a |