Arabidopsis arenicola

(Richardson ex Hooker) Al-Shehbaz

Canad. J. Bot. 84: 279. 2006

Basionyms: 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.

... more about "Arabidopsis arenicola"
Ihsan A. Al-Shehbaz +
(Richardson ex Hooker) Al-Shehbaz +
Eutrema arenicola +
Greenland +, Man. +, Nfld. and Labr. (Labr.) +, Nunavut +, Ont. +, Que. +  and Sask. +
0-1500 m +
Sandy beaches, gravel, flats of streambeds +
Flowering Jun–Aug. +
Canad. J. Bot. +
Arabis arenicola +, Arabis arenicola var. pubescens +, Arabis humifusa +  and Arabis humifusa var. pubescens +
Arabidopsis arenicola +
Arabidopsis +
species +