Arabis macdonaldiana

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]

Arabis macdonaldiana
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Arabis
Species:
A. macdonaldiana
Binomial name
Arabis macdonaldiana

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

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


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