| Ceratophyllum demersum L. | |
| Publ. & Syn. | L., Sp. Pl.: 992 (1753). |
| Notes | For some reason, there are several ambiguities concerning the reports from the Arctic of this easily recognized species. Rebristaya (PAF proposal) reported occurrences in the Russian Far East and western Alaska. Tzvelev (1987a) and Sekretareva (1999) did not report the species from the Arctic in the Russian Far East but Sekretareva (2004) marked it from East Chukotka. Hultén (1968a) and Porsild and Cody (1980) did not map any occurrence in the Arctic in Alaska but a such one was indicated by Les (1997). There are no specimens in ALA supporting it (Cook and Roland 2002). Sekretareva (1999) reported the species to reach the Arctic in the Yugorski Peninsula with a question mark and to reach the Borderline Arctic in Yana-Kolyma, in Sekretareva (2004) without question mark from both sides of the Polar Urals and Yana-Kolyma. Kovtonyuk (1993b) did not accept occurrences in the Arctic in Siberia. The discrepancies among Russian reports are probably due to different data sources (herbaria) being consulted. |
| Chromosomes | (1) 24 (2x?). - Europe, Canada, U.S.A.? - Several reports. (2) 48 (4x?). - Europe (Poland). - Skalinska et al. (1978). Not included: A report of 2n = 38 from southern Asia (Bir and Sidhu 1978). |
| Geography | Cosmopolitan: RUS SIB RFE ALA? CAN. |
| Distribution | N = S AN = b E = R CC = r YG = X CE = X UN = X YK = X AW = ? Kh = ? KP = r [ key ] |
| Parent taxon | Ceratophyllum L. |
| PAF ID | 350101 |