font settings and languages

Font Size: Large | Normal | Small
Font Face: Verdana | Geneva | Georgia
Languages:

Arabis hirsuta

(Hairy Rockcress)

Overview

[ Back to top ]

Interesting Facts

[ Back to top ]
 

Common Names

[ Back to top ]

Click on the language to view common names.

Common Names in English:

Hairy Rockcress, Hairy Rock Cress, Western Hairy Rock-Cress

Common Names in Romanian:

Gâscariţă

Description

[ Back to top ]

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]

Physical Description

Species Arabis hirsuta

Herbs perennial or sometimes biennial, (4-) 10-80(-110) cm tall, usually densely hispid , with simple and stalked , forked or substellate trichomes . Stems erect , usually simple basally, often branched above. Basal leaves rosulate; petiole (0.5-) 1-2 cm; leaf blade spatulate , oblanceolate , or oblong , (1.5-) 2.5-8(-10) × (0.5-) 1-2.5 cm, pubescent , margin entire, repand , or dentate , apex obtuse or acute. Cauline leaves sessile, lanceolate, oblong, oblanceolate, or ovate , (1-) 1.5-5(-7) × (0.5-) 1-2 cm, hirsute on both surfaces or adaxially glabrescent , base subcordate or auriculate and with obtuse or subacute auricles , margin dentate or entire, apex acute or obtuse. Racemes ebracteate . Fruiting pedicels erect to erect-ascending, (2-) 3-10(-15) mm, slender, glabrous or sparsely hirsute. Sepals narrowly oblong, 2.5-4 × 0.5-1.2 mm, not saccate . Petals white, rarely pink or purplish, linear-oblanceolate or narrowly spatulate, rarely linear , (3.5-) 4-5 × 1-1.5 mm, apex obtuse. Filaments slender, 2.5-4.5 mm; anthers oblong, 0.7-1 mm. Ovules 30-80 per ovary. Fruit linear, (1.5-) 2-5.5(-7) cm × 0.8-1.2 mm, erect to erect-ascending, often subappressed to rachis, flattened; valves glabrous, torulose , with a prominent midvein extending full length ; style (0.1-) 0.3-0.8(-1) mm. Seeds brown, oblong or suborbicular , (0.8-) 1-1.5(-1.7) × 0.8-1.3 mm, uniseriate , wingless, narrowly winged all around, or winged distally. Fl. Apr-Aug, fr. May-Sep. 2n = 32. [source]

A highly variable species, especially in spacing, shape , texture , base, and margin of cauline leaves, flower color, petal size, and density of indumentum. Many of the variants have been recognized at specific and infraspecific ranks . However, since the variation in China does not follow consistent morphological and/or geographical patterns , it is better to recognize only one variable taxon . [source]

The records in FRPS and Fl. Xinjiang. (2(2) : 142. 1995) of Arabis borealis Andrzejowski from Xinjiang, as well as those in FRPS and Fl. Guizhou. (7: 30. 1989) of A. sagittata de Candolle from Guizhou, are based on misidentified plants of A. hirsuta. Typical plants of A. sagittata are diploid (2n = 16) biennials with strongly sagittate cauline leaves, whereas those of A. hirsuta are tetraploid perennials or occasionally biennials with auriculate or subcordate cauline leaves. However, the distinction between the two is often difficult, especially in biennial plants of A. hirsuta. The present authors have examined no Chinese material that belongs to either A. borealis or A. sagittata. [source]

Habit: Forb/herb

Habitat

Meadows, grassy slopes , roadsides, mixed forests ; 300-4000 m (Ref. 51778).

Typically found at an altitude of 0 to 2,246 meters (0 to 7,369 feet).[2]

Biology

[ Back to top ]

Reproduction

Duration: Annual , Biennial, Perennial

Taxonomy

[ Back to top ]

Synonyms

A. hirsuta var. purpurea Y. C. Lan & T. Y. Cheo • A. sagittata de Candolle Var. nipponica Franchet & Savatier. • Arabis hirsuta var. nipponica (Franchet & Savatier) C. C. Yuan & T. Y. Cheo • Erysimum Hirsutum • Erysimum hirsutum (L.) Kuntze • Turrita Hirsuta • Turrita hirsuta (L.) Bubani • Turritis hirsuta L. • Turritis hirsuta Linnaeus

Notes

Name Status: Accepted Name .

Last scrutiny: 2009

Similar Species

[ Back to top ]

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

[ Back to top ]

Further Reading

[ Back to top ]

Notes

[ Back to top ]

Contributors

Data Sources

Accessed through GBIF Data Portal November 11, 2007:

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]
  2. Mean = 161.720 meters (530.577 feet), Standard Deviation = 208.090 based on 3,659 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012