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Arabis perennans - perennial rockcress

Scientific Family
Brassicaceae
Synonyms
Boechera perennans, A. angulata, A. arcuata, A. eremophila, A. gracilenta, A. recondita
Other common names
stiffarm rock cress
rock cress
Plant type
Forbs and Subshrubs
Origin
Native
Lifecycle
Perennial
Height
2 feet
Riparian
No

Has multiple branched stems and colorful small flowers above hairy basal leaves.

Basal leaves toothed or slightly wavy, obtuse, with star-shaped hairs; leaf stems and upper leaves hairless. Stems have dense, y-shaped hairs near the base, hairs not bristle-like; upper stems usually hairless. Flowers 4 petaled, white, pink or purplish.

Habitat

Found on rocky slopes and gravelly soil in warm desert, chaparral, and low montane habitats.

Plant Community
Desert Scrub
Grasslands
Interior Chaparral
Montane Conifer Forest
Pinyon Juniper Woodlands
Low elevation
2000
High elevation
8000

Flower Characteristics

Has 4 petals in the shape of a cross with dark veins to 1/4 inch long and 1/2 inch wide. Appears in loose terminal clusters of 16 to 35 flowers.

Flower color
White to pink to purplish
Flower shape
Regular
Tubular
Yes
First bloom month
February
Last bloom month
October
Flower clusters
Elongated

Leaf and Stem Characteristics

Primarily basal. Basal leaves are hairy and spatula-shaped to 3 inches long with toothed margins. Leaves on the lower stems are clasping, narrow and strap-like and may not be toothed or hairy.

Leaf type
Simple
Leaf color
Grayish-green
Leaf shape
Narrow
Leaf margin
Toothed
Leaf attachment
Basal & Alternate
Leaves clasp
Yes
Leaf hairs
Leaves & stems
Spines
No

Fruit and Seed Characteristics

Capsules to 2 inches long, slender, usually curved, hairless and usually hanging downward.

Fruit type
Capsule

Seed is round, <1/16 inch and winged.