Novon 7: 325. 1997
North America, n Europe, n, e Asia.
Subspecies 3 (3 in the flora).
Arabidopsis lyrata and its infraspecific taxa recognized below were treated in Arabis by R. C. Rollins (1993) and G. A. Mulligan (1996). As shown by S. L. O’Kane and I. A. Al-Shehbaz (1997, 2003), the two genera are relatively distantly related and A. lyrata should be placed in Arabidopsis with the rest of its relatives.
Arabidopsis lyrata is highly variable. It has been divided (see synonymy below) into independent species. The three subspecies recognized here are rather difficult to separate, especially where their ranges overlap. Cytological data are not helpful; both diploid and tetraploid populations have been reported for each of the three subspecies.
|1||Basal leaf blade margins entire or toothed; caudices well-developed, often branched, somewhat thickened.||Arabidopsis lyrata subsp. petraea|
|1||Basal leaf blade margins lyrate or lyrate-pinnatifid; caudices often slender, unbranched, or with a root crown||> 2|
|2||Basal leaf blade surfaces usually pubescent; petioles often hirsute; petals 6-8 mm; fruits 0.8-1 mm wide; styles 0.5-1 mm.||Arabidopsis lyrata subsp. lyrata|
|2||Basal leaf blade surfaces glabrous or sparsely pubescent; petioles often glabrous; petals (4-) 5-5.5(-6) mm; fruits 1.2-1.5(-1.8) mm wide; styles 0-0.5 mm.||Arabidopsis lyrata subsp. kamchatica|