Arabidopsis lyrata subsp. petraea

(Linnaeus) O’Kane & Al-Shehbaz
Novon 7: 326. 1997.
Basionym: Cardamine petraea Linnaeus Sp. Pl. 2: 654. 1753
Synonyms: Arabis media N. Busch
Treatment appears in FNA Volume 7. Treatment on page 450. Mentioned on page 449.

Perennials; caudex well-developed, often branched, somewhat thickened. Basal leaves: blade margins entire or toothed, without distinct terminal lobes. Petals 4–6 mm. Fruits 1.2–1.8 mm wide; style 0–0.5 mm. 2n = 16, 32.


Phenology: Flowering Jun–Jul.
Habitat: Sand dunes, sand bars, tussocks, gravel, tundra, volcanic ash, stream terraces
Elevation: 0 m

Distribution

V7 683-distribution-map.gif

Yukon, Alaska, n Europe, n, e Asia.

Discussion

The occurrence of subsp. petraea in North America was pointed out by S. L. O’Kane and I. A. Al-Shehbaz (1997) and Al-Shehbaz and O’Kane (www.aspb.org/publications/arabidopsis, 2002); no specimens were cited. G. A. Mulligan (1996), who treated the taxon as Arabis media, did not cite specimens either. Representative Alaskan collections were examined, including Parker 7995 (MO) and Hardy 134 (CAS, MO).

Selected References

None.

Lower Taxa

None.

Ihsan A. Al-Shehbaz +
(Linnaeus) O’Kane & Al-Shehbaz +
Cardamine petraea +
Yukon +, Alaska +, n Europe +, n +  and e Asia. +
Sand dunes, sand bars, tussocks, gravel, tundra, volcanic ash, stream terraces +
Flowering Jun–Jul. +
Arabis media +
Arabidopsis lyrata subsp. petraea +
Arabidopsis lyrata +
subspecies +