| Ranunculus monophyllos Ovcz. s. lat. | |
| Publ. & Syn. | Ovcz., Bot. Mater. Gerb. Glavn. Bot. Sada RSFSR 3: 54 (1922). Described from the Bashkir area near Ufa (European Russia). |
| Notes | Rebristaya and Elven: The group is characterized by 1-2 scales at the base of stems, the upper one larger than the lower one. Flowering stems are weak, often curved, and in the upper part more or less branched. Ranunculus monophyllos s. str. is a non-arctic agamospecies. The arctic plants are considered as one widespread agamospecies and three rather local ones, all entered informally. Elven: Ranunculus ponojensis is assumed to be the most widespread agamospecies in the Arctic. Also the western Alaskan plants are tentatively assigned to it. In view of the variation pattern elsewhere, it is probable that this geographically wide R. ponojensis will fall apart into several agamospecies with further study. Elven, Solstad, and Ericsson: Russian authors have assigned R. petroczenkoi to the R. arcticus group. Observing it in the field in 2004, Elven and Solstad found it rather different from R. arcticus, e.g., in different leaf shape and very much smaller and often irregular flowers, a feature characteristic of many agamospecies of the R. auricomus aggregate (note also the count of a pentaploid chromosome number). It co-occurs with R. arcticus in northern Yakutia but keeps distinct. The Nordic specialist on the R. auricomus aggregate, S. Ericsson, inspected specimens from several localities and assigned these to R. auricomus-monophyllos rather than to R. arcticus. We accordingly have transferred R. petroczenoki to R. monophyllos s. lat. |
| Chromosomes | (1) 16 (2x). - Siberia. - Kartashova et al. (1974). (2) 32 (4x). - Europe (N), Russia (N, C), Siberia (N, S), Asia (C). - Numerous reports. (3) 40 (5x). - Siberia. - Kartashova et al. (1974); Vodopyanova and Krogulevich (1981); Timokhina (1993, for R. petroczenkoi). (4) 46-48 48 (6x). - Far East (N). - At least five reports. Many reports from northern regions probably refer to the most widespread agamospecies, very tentatively indicated below as R. ponojensis. See, however, the occurrence of a hexaploid in the Russian Far East, whereas the other Eurasian plants are at lower ploidy levels. |
| Geography | European (N) - Asian (N/C) - amphi-Beringian (W): RUS SIB RFE ALA. |
| Distribution | N = R AO = r C = R D = F E = R YG = s FN = b CE = r CS = s UN = r YK = r AW = r Kh = s CW = r Tm = r KP = r [ key ] |
| Parent taxon | Ranunculus L. |
| PAF ID | 361223 |