Arabidopsis arenicola

(Richardson ex Hooker) Al-Shehbaz

Canad. J. Bot. 84: 279. 2006.

Basionym: Eutrema arenicola Richardson ex Hooker Fl. Bor.-Amer. 1: 67, plate 24. 1830
Synonyms: Arabis arenicola (Richardson ex Hooker) Gelert Arabis arenicola var. pubescens (S. Watson) Gelert Arabis humifusa Arabis humifusa var. pubescens S. Watson
Treatment appears in FNA Volume 7. Mentioned on page 448.

Perennials; (caudex usually branched, rarely simple, with persistent petiolar remains); glabrous throughout or sparsely to moderately pubescent, trichomes simple and short-stalked, forked, (to 0.5 mm). Stems often several from base (caudex), erect, ascending, or decumbent, unbranched or branched (few) distally, 0.5–2 (–3) dm, glabrous or sparsely pubescent distally. Basal leaves: petiole 0.5–2 cm, (ciliate or glabrous); blade (fleshy), oblanceolate to spatulate, 0.5–2 cm × 2–6 mm, margins entire or dentate, (not ciliate), apex obtuse or acute, surfaces pubescent or glabrous. Cauline leaves [(1–) 2–4 (–6)] sessile; blade oblong to oblanceolate, 0.7–1.8 (–2.5) cm × 2–5 mm, (base not auriculate), margins usually entire, rarely dentate, (apex obtuse or acute, surfaces glabrous or sparsely pubescent). Fruiting pedicels ascending to divaricate, 5–10 (–12) mm, (glabrous). Flowers: sepals 1.7–3 mm, lateral pair not saccate basally; petals white, usually oblanceolate, rarely spatulate, 4–5 × 1–2 mm; filaments 1.7–3 mm. Fruits (suberect to divaricate), straight, smooth, terete or slightly flattened, (0.8–) 1–2 (–2.8) cm × 1.5–2.2 (–2.5) mm; valves each with obscure midvein; ovules 30–54 per ovary; style 0.4–0.8 mm. Seeds (sometimes sub-biseriate), reddish-brown, narrowly oblong, 0.9–1.1 mm, pointed distally; cotyledons incumbent. 2n = 32.


Phenology: Flowering Jun–Aug.
Habitat: Sandy beaches, gravel, flats of streambeds
Elevation: 0-1500 m

Distribution

V7 678-distribution-map.gif

Greenland, Man., Nfld. and Labr. (Labr.), Nunavut, Ont., Que., Sask.

Discussion

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.

... more about "Arabidopsis arenicola"
ovate +  and oblong +
Acute (?) +  and Obtuse (?) +
Ihsan A. Al-Shehbaz +
(Richardson ex Hooker) Al-Shehbaz +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Eutrema arenicola +
appendaged +  and unappendaged +
1.8 cm18 mm <br />0.018 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
lyrate +, lobed +, toothed +  and entire +
oblong;oblanceolate +
much smaller +  and reduced +
2mm;5mm +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
differentiated +
emarginate +  and entire +
Greenland +, Man. +, Nfld. and Labr. (Labr.) +, Nunavut +, Ont. +, Que. +  and Sask. +
0-1500 m +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
actinomorphic +
2-valved +  and capsular +
2 cm20 mm <br />0.02 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
straight +
flattened +  and terete +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
latiseptate +  and unsegmented +
indehiscent +  and dehiscent +
angustiseptate +  and terete +
latiseptate +, subsessile +  and stipitate +
terete +  and torulose +
Sandy beaches, gravel, flats of streambeds +
subsessile +, sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
dentate +  and entire +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1-3-forked +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
rudimentary +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jun–Aug. +
trinucleate +  and 3(-11)-colpate +
Canad. J. Bot. +
not elongated +
reflexed +  and ascending +
slender +
not +  and mucilaginous +
margined +  and not winged +
uniseriate +  and biseriate +
not +  and mucilaginous +
pointed +  and oblong +
0.9mm +  and 1.1mm +
persistent +  and caducous +
distinct +
ascending +  and erect +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
branched +  and unbranched +
procumbent +  and decumbent +
decumbent +, ascending +  and erect +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
glabrous +  and pubescent +
Arabis arenicola +, Arabis arenicola var. pubescens +, Arabis humifusa +  and Arabis humifusa var. pubescens +
Arabidopsis arenicola +
Arabidopsis +
species +
short-stalked +  and simple +
pubescent +  and glabrous +
anastomosing +
glabrous +  and pubescent +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +