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.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.

ovate +  and oblong +
Ihsan A. Al-Shehbaz +
(Linnaeus) O’Kane & Al-Shehbaz +
Cardamine petraea +
appendaged +  and unappendaged +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (4.2 cm42 mm <br />0.042 m <br />) +
toothed +  and entire +
oblanceolate;ovate;oblanceolate +
much smaller +  and reduced +
1mm;8mm +
urceolate +, campanulate +  and tubular +
well-developed +
sessile +  and petiolate +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
Yukon +, Alaska +, n Europe +, n +  and e Asia +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
actinomorphic +
2-valved +  and capsular +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2cm;4.5cm +
flattened +  and torulose +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
angustiseptate +  and terete +
latiseptate +, subsessile +  and stipitate +
terete +  and torulose +
Sand dunes, sand bars, tussocks, gravel, tundra, volcanic ash, stream terraces +
subsessile +, sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
lyrate-pinnatifid +, dentate +  and entire +
lobed;toothed;repand;toothed;repand;entire +
obscure +  and prominent +
forked +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
rudimentary +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering Jun–Jul. +
trinucleate +  and 3(-11)-colpate +
not elongated +
reflexed +  and ascending +
slender +
not +  and mucilaginous +
margined +  and not winged +
uniseriate +  and biseriate +
not +  and mucilaginous +
0.8mm +  and 1.4mm +
persistent +  and caducous +
distinct +
ascending +  and erect +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +, few to several +  and simple +
procumbent +  and decumbent +
decumbent +  and erect +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
glabrous or +  and sparsely densely pubescent +
Arabis media +
Arabidopsis lyrata subsp. petraea +
Arabidopsis lyrata +
subspecies +
pubescent +  and glabrous +
pubescent +  and glabrous +
anastomosing +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +