Arabis macdonaldiana

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Brassicales

Familia: Brassicaceae
Tribus: Arabideae
Genus: Arabis
Species: Arabis mcdonaldiana
Name

Arabis mcdonaldiana Eastw., 1903
Synonyms

Arabis serpentinicola Rollins

References

Eastwood, A., 1903. Bull. Torrey Bot. Club 30: 488.

Links

Koch, M.A. et al. 2019. Arabis mcdonaldiana in BrassiBase Tools and biological resources to study characters and traits in the Brassicaceae. Published online. Accessed: 2019 May 15.
International Plant Names Index. 2019. Arabis mcdonaldiana. Published online. Accessed: May 15 2019.
The Plant List 2013. Arabis mcdonaldiana in The Plant List Version 1.1. Published online. Accessed: 2019 May 15.
Tropicos.org 2019. Arabis mcdonaldiana. Missouri Botanical Garden. Published online. Accessed: 15 May 2019.

Vernacular names
English: MacDonald's rockcress

Arabis macdonaldiana is a species of flowering plant in the mustard family known by the common name MacDonald's rockcress. It is native to northern California and Oregon, where it grows on newly exposed, barren serpentine soils in openings in temperate coniferous forest habitat. It is a rare and endangered plant known from several sites in California and approximately two occurrences in Oregon, where it is threatened mainly by mining, particularly of nickel, which is one of several metals plentiful in the serpentine.[1] On September 29, 1978, this was the second plant to be federally listed as an endangered species.[1]

Description

This is a perennial herb growing one or more slender stems from a small, branching caudex, reaching 10 to 30 centimeters tall. There is a basal patch of leaves with edges lined in small, widely spaced teeth which are sometimes tipped with spines. The leaves may lack teeth and have wavy margins. There may also be a few smaller leaves along the stem. The top of the stem forms an inflorescence of a few flowers, each with four bright rose-purple petals. The fruit is a flat, straight silique about 3 centimeters long which contains several oblong little seeds.
See also

List of Arabis species

References

Center for Plant Conservation Archived August 19, 2009, at the Wayback Machine