Arabis holboellii var. retrofracta

(, A Holboell Rock-Cress)

Taxonomy

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Kingdom: Plantae - Plants
- Phylum: Tracheophyta - Vascular Plants
  - Class: Magnoliopsida - Dicotyledons
    - Order: Capparales
      - Family: Calliduloidea
        Subfamily: Faboideae
        Tribe: Arabideae
        Genus: Arabis (AR-uh-biss) Linnaeus, Sp. Pl. 2: 664. 1753. - Rockcress
        Specific epithet: holboellii (Graham) Rydb.
        Variety: retrofracta
        Botanical name: Arabis holboellii var. retrofracta (Graham) Rydb.

Unambiguous Synonyms:

Arabis arcuata var. secunda (T.J. Howell) Robertson
Arabis caduca A. Nels.
Arabis consanguinea Greene
Arabis exilis A. Nels.
Arabis holboellii var. consanguinea (Greene) G. Mulligan
Arabis holboellii var. secunda (T.J. Howell) Jepson
Arabis holboellii var. tenuis Böcher
Arabis kochii Blank.
Arabis lignipes A. Nels.
Arabis mcdougalii Rydb.
Arabis polyantha Greene
Arabis retrofracta Graham
Arabis retrofracta var. multicaulis Boivin
Arabis rhodanthus Greene
Arabis secunda T.J. Howell
Arabis tenuis Greene
Boechera retrofracta (Graham) A.& D. Löve
Boechera tenuis (Böcher) A.& D. Löve

Notes:

Name Status: Accepted Name. Latest taxonomic scrutiny: 15-Mar-2000

Physical Description

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Subfamily Faboideae:

Mostly herbs, shrubs, or trees. Leaves pinnate or palmate to trifoliolate or apparently simple. Corolla usually, showy, zygomorphic, the petals imbricate, posterior (upper or banner) petal outermost in bud. Stamens 10 or 9 + 1 (diadelphous), not showy. Pollen released in monads. Seeds with u-shaped line (pleurogram) lacking. [Carr]

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]

Distribution

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Range and Population

North America

Similar Species

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Members of the genus Arabis:

More Info

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Notes

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Contributors:

Bisby, F.A., Y.R. Roskov, M.A. Ruggiero, T.M. Orrell, L.E. Paglinawan, P.W. Brewer, N. Bailly, J. van Hertum, eds (2007). Species 2000 & ITIS Catalogue of Life: 2007 Annual Checklist. Species 2000: Reading, U.K.
Brands, S.J. (comp.) 1989-2007. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed March 28, 2007.

Identifiers:

Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 184362
Global Biodiversity Information Facility Taxonkey: 13890573
Globally Unique Identifier: urn:lsid:ipni.org:names:1007487-2
Natural Heritage Network Species Identifier: PDBRA060W5
Zipcode Zoo Species Identifier: 1057364

Footnotes:

"Arabis". in Flora of China Vol. 8 Page 113. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.

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Last Revised: May 11, 2008