670502 Arabidopsis kamchatica (Fisch. ex DC.) K. Shimizu & Kudoh
Distribution
West Chukotka: Rare
South Chukotka: Rare
East Chukotka: Frequent
Western Alaska: Scattered
Northern Alaska - Yukon: Rare
Southern Arcti Tundra: Rare
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent
- K. Shimizu & Kudoh, Acta Phytotax. Geobot. 56: 167 (2005). - Arabis lyrata var. kamchatica Fisch. ex DC., Syst. Nat. 2: 231 (1821). Lectotype (G-DC): Russian Far East: Kamchatka, leg. Fischer (Shimizu et al. 2005: 167). - Cardaminopsis kamchatica (Fisch. ex DC.) O.E. Schulz in Engl. & Prantl, Nat. Pflanzenfam., ed. 2, 17b: 541 (1936). - Arabis lyrata subsp. kamchatica (Fisch. ex DC.) Hultén, Fl. Aleut. Isl.: 202 (1937). - Arabidopsis lyrata subsp. kamchatica (Fisch. ex DC.) O'Kane & Al-Shehbaz, Novon 7: 326 (1997).
2n=
32 (4x). - Far East (N), Alaska, Canada. - Several reports, numerous counts.
Not included: Recently, Koch et al. (1999) accepted 2n = 16 for A. lyrata subsp. kamchatica. The Alberta material behind the report (Packer and Whitkus 1982) should be checked. A report of 2n = 16 from Manitoba (Löve and Löve 1982a) might belong to the diploid A. lyrata.
Geography: Amphi-Pacific/Beringian - North America (NW): RFE ALA CAN.
Notes: Reports of Arabidopsis lyrata from the Murman area in northwestern European Russia (Pissjaukova 1956) have been excluded as probably based on misidentified A. arenosa.
O'Kane and Al-Shehbaz (1997) circumscribed A. lyrata broadly with three subspecies: the non-arctic eastern North American subsp. lyrata (described from eastern Canada, leg. Kalm), the amphi-Pacific/Beringian subsp. kamchatica, and the nearly circumpolar arctic-alpine subsp. petrata (incl. "septentrionalis" and "umbrosa"). For the last-mentioned taxon, see below. Based on field experiences with most of the taxa ("kamchatica", "petraea", "septentrionalis", "umbrosa"), we are reluctant to see them only as races of one species, and especially the three last-mentioned ones as a single race (subsp. petraea). We see some morphological differences (and some ploidy difference) and little or no intergradation. Al-Shehbaz commented that he found no differences. There may be a conflict between evidence from molecular markers and phylogenetic approaches on one side, and from the combined morphological, ecological, and phytogeographical pattern on the other side. For botanists working with the plants in the field and collections and for practical biodiversity concerns, the latter sources of information are important, and also for this Checklist.
Mulligan commented that he would prefer the tetraploid A. kamchatica accepted as a species apart from the diploid eastern North American A. lyrata. Petrovsky commented that he would prefer it as a subspecies of A. lyrata. Al-Shehbaz (2010b) followed the same course. We enter a species due to Mulligan's view as the distinction of A. kamchatica from A. lyrata is a North American problem and as there is a ploidy difference. Arabidopsis kamchatica might be an allotetraploid with A. lyrata as one parent and an Asian species as the other (Shimizu et al. 2005).
Higher Taxa
- Arabidopsis [6705,genus]