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50. Arabidopsis Heynhold in Holl & Heynhold, Fl. Sachsen. 1: 538. 1842.
[nom. cons.]

鼠耳芥属 shu er jie shu

Arabidopsis thaliana

Credit: Photo: Al-Shehbaz

Cardaminopsis (C. A. Meyer) Hayek; Hylandra Á.. Löve.

Herbs annual, biennial, or perennial with stolons or woody caudex. Trichomes simple, mixed with stalked, 1-3-forked ones. Stems erect or decumbent, often several from base, usually glabrous above. Basal leaves rosulate, entire, toothed, or pinnately lobed. Cauline leaves petiolate or subsessile, entire, dentate, or rarely lyrate. Racemes few to several flowered, ebracteate. Fruiting pedicels ascending or divaricate or slightly reflexed. Sepals oblong, erect or ascending, glabrous or pubescent, base of lateral pair subsaccate or not. Petals white, pink, or purple; blade obovate, spatulate, or oblanceolate, apex obtuse or emarginate; claw distinct or not. Stamens 6, erect, slightly tetradynamous; filaments not dilated basally; anthers oblong, obtuse. Nectar glands confluent, subtending bases of filaments. Ovules 15-80 per ovary. Fruit dehiscent siliques, linear or cylindric, terete or flattened and latiseptate, shortly stipitate or subsessile; valves papery, veinless or midvein distinct, glabrous, smooth or somewhat torulose; replum rounded; septum complete; style obsolete or to 1 mm; stigma capitate, entire. Seeds numerous, uniseriate, wingless or margined, oblong or ellipsoid, plump or flattened; seed coat minutely reticulate, mucilaginous or not when wetted; cotyledons accumbent or rarely incumbent.

Nine species: E and N Asia, Europe, North America; three species in China.

1 Fruit terete; annuals; petals 2-3.5 mm; seeds usually plump; cotyledons incumbent   1 A. thaliana
+ Fruit strongly flattened; biennials or perennials; petals 4-6.5 mm; seeds usually flattened; cotyledons accumbent.   (2)
2 (1) Plants stoloniferous perennials; fruit valves not veined; basal leaves orbicular or pinnate with orbicular to suborbicular terminal lobes   2 A. halleri subsp. gemmifera
+ Plants non-stoloniferous biennials or perennials; fruit valves with a prominent midvein; basal leaves spatulate or oblanceolate, rarely obovate, without orbicular terminal lobes   3 A. lyrata subsp. kamchatica

Lower Taxa


Related Objects  
  • O'KANE, Jr., S.L. & I.A. AL-SHEHBAZ. 2003. Phylogenetic position and generic limits of Arabidopsis (
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