Chromosome numbers of some plants from the unglaciated central Yukon plateau, Canada

Chromosome numbers are given for 58 plant taxa of the Yukon Territory, especially from the unglaciated areas in the Ogilvie Mountains. The chromosome numbers of the following taxa were previously unknown: Rumex arcticus Trautv., 2n = 40; Claytonia arctica Adams, 2n = 10; Arenaria arctica Stev., 2n = ca. 80; Arenaria physodes Fisch. ex DC., 2n = 66; Melandrium taylorae (Robins.) Tolm., 2n = 48; Ranunculus gelidus Kar. & Kir., 2n = 16; Ranunculus sceleratus ssp. multifidus (Nutt.) Hult., 2n = 64; Ranunculus purshii Richards., 2n = 64; Thalictrum sparsiflorum Turcz. var. richardsonii (Gray) Boivin, 2n = 14; Chrysosplenium wrightii Franch. & Sav., n = 12 and 2n = 24; Saxifraga adscendens ssp. oregonensis (Raf.) Bacigalupi, n = 11; Saxifraga punctata L., 2n = ca. 84; Saxifraga radiata Small, n = 13; Dryas alaskensis Porsild, 2n = 18; Geum rossii (R. Br.) Sér., 2n = 70; Potentilla ledebouriana Porsild,2n = 28; Oxytropis huddelsonii Porsild, 2n = 16; Epilobium ciliatum Raf., 2n = 36; Penstemon gormanii Greene, 2n = 16; Synthyris borealis Pennell, 2n = 24; Arnica lessingii Greene, 2n = 57.