| Chamerion latifolium (L.) Holub | |
| Publ. & Syn. | Chamaenerion subdentatum Rydb., Fl. Rocky Mts.: 585 (1917). Described from the Rocky Mountains. - Chamerion subdentatum (Rydb.) Á. Löve & D. Löve, Bot. Not. 128: 516 (1976). |
| Notes | Small (1968) made a study of Chamerion latifolium parallel to Mosquin's (1966) study of C. angustifolium but reached different conclusions. There were differences in the geographical ranges of the two ploidy levels but no consistent morphological difference except for the balance between triporate pollen grains in the tetraploid plants and mixed triporate and tetraporate ones in the octoploid plants. Quadrivalent formation was very pronounced and autoploidy is suggested. Löve and Löve (1976a) raised the tetraploids to species rank as C. subdentatum, based on a morphologically not very convincing argument: "This is the tetraploid mainly western American and eastern Asian alpine taxon corresponding to the more widespread and almost circumpolar arctic-alpine octoploid species C. latifolium (L.) Holub". In 1975, the Löves denoted the two as hexaploid and dodecaploid (with base number x = 6), in 1976 as tetraploid and octoploid (with base number x = 9). We follow Small's good arguments for not recognizing named races. |
| Chromosomes | (1) 36 (4x?). - Siberia, Asia (C), Far East, Alaska, Canada, U.S.A. - Several reports, numerous counts. (2) 54 (6x?). - Canada. - Mosquin and Hayley (1966); Small (1968, two counts). (3) 72 (8x?). - Europe (N), Russia (N), Siberia (N, S), Far East, Alaska, Canada, Greenland. - Numerous reports. |
| Geography | Circumpolar-alpine: ICE RUS SIB RFE ALA CAN GRL. |
| Distribution | N = F A = R AN = f B = F AO = r C = F GW = f D = F Ic = f E = F CC = f WI = s HL = f EP = f CE = f CS = s UN = s AW = f GE = f Kh = s CW = s Tm = r [ key ] |
| Parent taxon | Chamerion (Raf.) Raf. |
| PAF ID | 520203 |