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Arabis aizoides

Interesting Facts

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Description

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Genus Arabis

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 .

About 70 species: temperate Asia, Europe, North America; 14 species (one endemic) in China.

The limits of Arabis are highly artificial, and the genus is defined primarily on the basis of having branched trichomes, flattened, linear fruit, and accumbent cotyledons . However, this combination of characters has evolved independently several times in the Brassicaceae. A critical study of the genus on worldwide basis is much needed.[1]

Taxonomy

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Similar Species

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Members of the genus Arabis

ZipcodeZoo has pages for 227 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

A. aculeolata (Waldo Rock-Cress) · A. alpina (Alpine Rock Cress) · A. androsacea (Rock Cress) · A. arendsii 'Compinkie' (Rock Cress) · A. arenicola (Arctic Rock-Cress) · A. aubrietioides (Rockcress) · A. beckwithii (Beckwith's Rockcress) · A. blepharophylla (Coast Rock Cress) · A. blepharophylla 'Red Sensation' (Pink Rock Cress) · A. blepharophylla 'Spring Charm' (Pink Rock Cress) · A. bodiensis (Bodie Hill Rock Cress) · A. boivinii (Boivin's Rockcress) · A. breweri (Brewer's Rock-Cress) · A. breweri var. austiniae (Brewer's Rockcress) · A. breweri var. austiniae (Greene) Rollins (Brewer's Rockcress) · A. breweri var. breweri (Brewer's Rockcress) · A. breweri var. breweri S.Watson (Brewer's Rockcress) · A. breweri var. pecuniaria (Brewer's Rockcress) · A. breweri var. pecuniaria Rollins (Brewer's Rockcress) · A. bryoides (Rockcress) · A. calderi (Calder's Rockcress) · A. canadensis (Sicklepod) · A. carduchorum (Rockcress) · A. caucasica (Gray Rockcress) · A. caucasica 'Compinkie' (Compinkie Arabis) · A. caucasica 'Rosea' (Rock Cress) · A. caucasica 'Snowcap' (Rock Cress) · A. caucasica 'Snow Cap' (Snow Cap Rock Cress) · A. caucasica 'Spring Charm' (Spring Charm Arabis) · A. cobrensis (Gray Rockcress) · A. codyi (Cody's Rockcress) · A. collina rosea (Rockcress) · A. constancei (Constance's Rock Cress) · A. crandallii (Crandall's Rock-Cress) · A. crucisetosa (Cross-Haired Rock Cress) · A. cusickii (Cusick's Rockcress) · A. davidsonii (Davidson's Rockcress) · A. davidsonii var. davidsonii (Davidson's Rockcress) · A. davidsonii var. parva (Davidson's Rockcress) · A. demissa (Nodding Rockcress) · A. demissa var. demissa (Nodding Rockcress) · A. demissa var. demissa Greene (Nodding Rockcress) · A. demissa var. languida (Nodding Rockcress) · A. demissa var. languida Rollins (Nodding Rockcress) · A. dispar (Pinyon Rockcress) · A. divaricarpa (Spreading Rockcress) · A. drummondii (Canadian Rockcress) · A. eschscholtziana (Eschscholtz's Hairy Rockcress) · A. falcatoria (Grouse Creek Rockcress) · A. falcifructa (Elko Rockcress) · A. fecunda (Sapphire Rockcress) · A. fendleri (Fendler Rock-Cress) · A. fendleri var. fendleri (Fendler's Rockcress) · A. fendleri var. spatifolia (Spoonleaf Rockcress) · A. fendleri var. spatifolia (Rydb.) Rollins (Fendler Rockcress) · A. ferdinandi-coburgii (Rockcress) · A. ferdinandi-coburgii 'Old Gold' (Arabis) · A. ferdinandi-coburgii 'Variegata' (Rockcress) · A. ferdinandi-coburgi 'Old Gold' (Alpine Wall Cress) · A. fernaldiana (Fernald Rock-Cress) · A. fernaldiana Rollins var. fernaldiana Rollins (Rockcress) · A. fernaldiana Rollins var. stylosa (S.Watson) Rollins (Rockcress) · A. fernaldiana var. fernaldiana (Park Rockcress) · A. fernaldiana var. stylosa (Park Rockcress) · A. fructicosa (Fruit Rock Cress) · A. furcata (Cascade Rockcress) · A. furcata S.Watson var. furcata S.Watson (Columbia Gorge Rockcress) · A. furcata S.Watson var. olympica (Piper) Rollins (Columbia Gorge Rockcress) · A. furcata var. furcata (Columbia Gorge Rockcress) · A. furcata var. olympica (Columbia Gorge Rockcress) · A. georgiana (Georgia Rock-Cress) · A. glabra (Tower Rockcress) · A. glabra var. glabra (Tower Rockcress) · A. glaucovalvula (Blue-Pod Rockcress) · A. gracilipes (Flagstaff Rockcress) · A. gunnisoniana (Gunnison's Rockcress) · A. hastatula (Eared Rockcress) · A. hirshbergiae (Cuyamaca Rockcress) · A. hirsuta (Hairy Rockcress) · A. hirsuta pycnocarpa (Hairy Rockcress) · A. hirsuta sagittata (Hairy Rockcress) · A. hirsuta var. glabrata (Hairy Rockcress) · A. hirsuta var. hirsuta (Hairy Rockcress) · A. hirsuta var. pycnocarpa (Creamflower Rockcress) · A. hoffmannii (Hoffmann's Rock Cress) · A. holboellii (Holboell Rock-Cress) · A. holboellii Hornem. var. pendulocarpa (A.Nelson) Rollins (Dropseed Rockcress) · A. holboellii Hornem. var. pinetorum (Tidestr.) Rollins (Holboell's Rockcress) · A. holboellii var. collinsii (Holboell's Rockcress) · A. holboellii var. holboellii (Holboell's Rockcress) · A. holboellii var. pendulocarpa (Dropseed Rockcress) · A. holboellii var. pinetorum (Holboell's Rockcress) · A. holboellii var. retrofracta (Holboell Rock-Cress) · A. inyoensis (Inyo Rockcress) · A. johnstonii (Johnston's Rock Cress) · A. kamchatica (Kamchatica Rockcress) · A. kennedyae (Troodos Rockcress) · A. koehleri (Koehler Rock-Cress) · A. koehleri T.J.Howell var. koehleri T.J.Howell (Koehler's Rockcress) · A. koehleri T.J.Howell var. stipitata Rollins (Koehler's Rockcress)

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. "Arabis". in Flora of China Vol. 8 Page 113. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
Last Revised: 2012-07-28