Arabis L.
  • Sp. Pl. 2: 664. 1753. (1 May 1753)
  • Rockcress [Latin Arabia]


Cite taxon page as 'WFO (2021): Arabis L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000002813. Accessed on: 21 Sep 2021'

General Information

Herbs annual, biennial, or perennial, rarely subshrubs or shrubs. Trichomes stellate, dendritic, or stalked forked, sometimes mixed with fewer simple ones, rarely primarily simple. Stems simple or branched apically. Basal leaves petiolate, rosulate, simple, often entire, sometimes dentate, rarely lyrate-pinnatifid. Cauline leaves sessile and auriculate, sagittate, or amplexicaul, very rarely petiolate, entire or dentate. Racemes ebracteate or rarely bracteate throughout or only basally, sometimes in panicles, elongated in fruit. Fruiting pedicels erect, ascending, divaricate, or reflexed. Sepals ovate or oblong, base of lateral pair saccate or not, margin membranous. Petals white, pink, or purple; blade spatulate, oblong, or oblanceolate, rarely obovate, apex obtuse or emarginate; claw shorter than sepals. Stamens 6, tetradynamous; filaments usually not dilated at base; anthers ovate, oblong, or linear, obtuse at apex. Nectar glands confluent, subtending bases of all stamens; median glands sometimes toothlike and free, rarely absent; lateral glands semiannular or annular. Ovules 12-110 per ovary. Fruit dehiscent siliques, linear, latiseptate, sessile or rarely shortly stipitate; valves papery, with an obscure or prominent midvein, smooth or torulose; replum rounded; septum complete, membranous, translucent, veinless; style obsolete or distinct; stigma capitate, entire or slightly 2-lobed. Seeds uniseriate or biseriate, winged or margined, oblong or orbicular, flattened; seed coat smooth or minutely reticulate, not mucilaginous when wetted; cotyledons accumbent.

  • Provided by: [E].Flora Of CHina @ efloras.org
    • Source: [
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    Annuals, biennials, or perennials; (sometimes stoloniferous with vegetative rosettes, or caudex simple or branched); not scapose; often pubescent or hirsute, sometimes glabrous or glabrate, trichomes stalked, stellate, sometimes mixed with fewer, simple or forked ones. Stems erect, ascending, or decumbent, unbranched or branched distally. Leaves basal and cauline; petiolate or sessile; basal rosulate, petiolate or sessile, blade margins usually entire or dentate to denticulate, rarely lyrate-pinnatifid; cauline usually sessile, rarely shortly petiolate, blade (base often auriculate, sagittate, or amplexicaul), margins entire or dentate. Racemes (sometimes paniculate, usually simple, sometimes branched). Fruiting pedicels erect, ascending, or divaricate, (not reflexed or secund), slender. Flowers: sepals erect or ascending, ovate or oblong, lateral pair saccate or not basally, (margins membranous); petals white, pink, or purple, usually spatulate, oblong, or oblanceolate, rarely obovate, claw differentiated from blade, (shorter than sepals, apex obtuse or rounded); stamens tetradynamous; filaments usually not dilated basally; anthers ovate, oblong, or linear, (apex obtuse); nectar glands confluent, subtending bases of stamens, lateral glands semiannular or annular, median glands rarely absent, (sometimes toothlike and distinct). Fruits siliques, usually sessile, rarely shortly stipitate, linear, smooth or torulose, (usually straight, sometimes slightly curved), flattened, latiseptate; valves (papery), each with obscure or prominent midvein, glabrous; replum (visible), rounded; septum complete, (membranous, translucent, veinless); ovules 10-86[-110] per ovary; style obsolete or distinct; stigma capitate, (sometimes slightly 2-lobed). Seeds uniseriate, flattened, winged or margined, oblong or orbicular; seed coat (smooth or minutely reticulate), not mucilaginous when wetted; cotyledons accumbent. x = 8.

  • Provided by: [C].Flora of North America @ efloras.org
    • Source: [
    • 5
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    "Sep erect or spreading, the outer sometimes saccate at base; pet white, yellowish, or pink, narrowly spatulate to oblong or obovate; anthers oblong; ovary cylindric; ovules numerous; style short and scarcely differentiated; stigma truncate; fr linear, elongate, flat or subterete, the valves often with a midvein or reticulately veined; seeds flattened, often winged; annual to perennial herbs, the basal lvs petioled, usually simple, the cauline smaller and usually sessile; pubescence variable but usually present. 180, N. Hemisphere."

  • Provided by: [D].New York Botanical Garden
    • Source: [
    • 6
    • ]. 

    Morphology

    Ovary narrowly cylindrical, usually with a very short style and flat stigma; ovules numerous

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Nectaries usually as prominent glands outside and ± around the lateral stamens, and as a smaller simple or bifid gland outside each pair of median stamens

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Seeds uniseriate, ovoid, finely reticulate, not mucilaginous.

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Fruit a siliqua, dehiscent, linear, flattened; valves thin with a fine midnerve

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Racemes terminal, ebracteate, ± corymbose, mostly with small flowers, in fruit cylindrical and elongate, dense to lax

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Hairs usually present, very often stellate or otherwise branched, also simple

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Annual, biennial or perennial small to medium-sized herbs, with a taproot and often unbranched or little branched stems

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Petals white, cream, pale blue or violet, spathulate to clawed

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Stamens with linear filaments

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
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    Sepals not spreading, the lateral ones sometimes saccate

  • Provided by: [B].Plants Of the World Online Portal - FTEA
    • Source: [
    • 3
    • ]. 

    Plantes herbacées , annuelles, bisannuelles ou vivaces, généralement pubescentes et à poils ramifiés ou étoilés; tige le plus souvent simple.'Feuilles'basilaires ± pétiolées et en rosettes; feuilles caulinaires sessiles, embrassantes à la base et auriculées, parfois seulement atténuées.'Racèmes's'allongeant à la fructification.'Fleurs'à sépales obliques, égaux, les internes ± gibbeux à la base; pétales ordinairement onguiculés; étamines 6; anthères oblongues, obtuses au sommet; ovaire sessile à courtement stipité; style court; stigmate déprimé ± bilobé.'Siliques'± divariquées, aplaties, linéaires, plurispermes; valves planes, comprimées, à nervure médiane peu marquée.'Graines sur 1 rang et ± ailées; embryon à cotylédons plans; radicule latérale (o =).\n\t\t\t\tGenre boréal comprenant une centaine d'espèces, dont quelques-unes habitent les montagnes de l'Afrique tropicale.

  • Provided by: [F].Flore d'Afrique Centrale
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    Literature

    SELECTED REFERENCES Hopkins, M. 1937. Arabis in eastern and central North America. Rhodora 39: 63-98, 106-148, 155-186. Mulligan, G. A. 1996. Synopsis of the genus Arabis (Brassicaceae) in Canada, Alaska and Greenland. Rhodora 97: 109-163. Rollins, R. C. 1936. The genus Arabis in the Pacific Northwest. Res. Stud. State Coll. Wash. 4: 1-52. 1936. Rollins, R. C. 1941. A monographic study of Arabis in western North America. Rhodora 43: 289-325, 348-411, 425-485.

  • Provided by: [C].Flora of North America @ efloras.org
    • Source: [
    • 5
    • ]. 

    Included Species

    Other Local Names

    NameLanguageCountry
    Rockcress [Latin Arabia]

      Bibliography

     Information From

    Brassicaceae
    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B
    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Flora of North America Association
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • D Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • E Missouri Botanical Garden
    Flore d'Afrique Centrale
    https://www.floredafriquecentrale.be
    • F http://creativecommons.org/licenses/by/4.0/ Attribution 4.0 International (CC BY 4.0)
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • G CC0 1.0 Universal (CC0 1.0).