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PlantFiles: Braun's Rock Cress
Arabis perstellata

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Family: Brassicaceae (brass-ih-KAY-see-ee) (Info)
Genus: Arabis (AR-uh-biss) (Info)
Species: perstellata (per-stel-AH-tuh) (Info)

Category:
Perennials

Height:
24-36 in. (60-90 cm)

Spacing:
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)

Hardiness:
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Light Shade
Partial to Full Shade

Danger:
Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Profile:

No positives
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorContent
Neutral Schmetterling On Sep 7, 2001, Schmetterling from Louisville, KY (Zone 6a) wrote:

THIS PLANT IS ENDANGERED!

Both varieties of Arabis perstellata E.L. Braun, (Arabis perstellata E. L. Braun var. ampla Rollins, large rock cress, and Arabis perstellata E.L. Braun var. perstellata Fernald, small rock cress) are perennial members of the mustard family (Brassicaceae). The large rock cress is known from only one county in Tennessee, and the small rock cress is known from only three counties in Kentucky. Both varieties have round stems and alternate leaves. Their stems and foliage have a grayish coloration due to the large quantity of hairs. Their stems arise from horizontal bases and grow up to 80 centimeters (cm) (31.5 inches) long, often drooping from rock ledges. Each year a basal rosette of leaves is produced, and new flowering branches emerge from the old rosette of the previous season. Their lower leaves vary from 4 to 15 cm (1.6 to 6.0 inches) long and are obovate to oblanceolate with slightly toothed and pinnatifid margins. Their upper leaves are smaller--up to 3.5 cm (1.4 inches) long--and are elliptic to oblanceolate, with coarse teeth along the margin. Both surfaces of their leaves are stellate-pubescent. The inflorescence is an elongate raceme with numerous flowers. Their flowers have four petals that are 3 to 4 millimeters (mm) (0.12 to 0.16 inch) long, are white to lavender, and have four pale green sepals that are 2 to 3 mm (0.08 to 0.12 inch) long. There are six stamens, with two shorter than the other four. The ovary is elongate, two-chambered, and develops into a silique. Fruiting stalks are about 1 cm (0.4 inch) long at maturity; siliques are up to 4 cm (1.6 inches) long and are covered with both simple and stellate hairs. Flowering is from late March to early May. Fruits mature from mid-May to early June. Their oblong seeds are reddish brown; somewhat flattened; about 1 mm (0.04 inch) long; and, in places, minutely hairy (Jones 1991).

Arabis perstellata is typically found on wooded steep slopes with limestone outcrops. The outcrops tend to be moist but not wet; rarely, plants can be found on seepy outcrops. They also may be found in protected areas, such as around the bases of larger trees, or in areas where there is little competition, such as around areas regularly scoured by talus movement or erosion. The plants have a well-developed system of rootstocks that allow them to persist in these inhospitable sites. Sometimes plants display a weedy tendency, colonizing recent road cuts or animal paths through the woodlands. The plants survive in full shade or filtered light, but are not found in full sunlight (Jones 1991).



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