Boechera species

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Scientific Name Boechera holboellii (Arabis holboellii) USDA PLANTS Symbol
ARHO2
Common Name Holboell's Rockcress ITIS Taxonomic Serial No.
509589
Family Brassicaceae (Mustard) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine. Open, dry or rocky areas.
Plant: Erect biennial or perennial 12 to 24 inches tall, 1 to several stems.
Leaves: Basal leaves 1/2 to 2 inches long, linear to spatulate, pointed tips and dense hairs; stem leaves oblong or lanceolate 1 to 1-1/2 inches long, hairy lower surface, upper may be somewhat hairy.
Inflorescence: Numerous purple-pink-whitish drooping flowers in a raceme, each about 1/2 inch long.
Reference: Excerpts from SEINet.
Colorado Status
Native
Scientific Name Boechera stricta (Arabis drummondii) USDA PLANTS Symbol
ARDR
Common Name Drummond's Rockcress ITIS Taxonomic Serial No.
822989
Family Brassicaceae (Mustard) SEINet
Reference
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Description Life zones and habitat: Montane to subalpine. Gravelly or rocky slopes, meadows, openings.
Plant: Erect perennial 1 to 3 feet tall (6 to 18 inches at altitude), usually one slender stem.
Leaves: Mostly basal leaves from a rosette, 3/4 to 3 inches long, narrow, oblanceolate, pointed tip, fleshy.
Inflorescence: Several small, erect blossoms in a raceme, each with 4 white or pinkish petals.
Reference: Excerpts from "Guide to Colorado Wildflowers" by G.K. Guennel.
Note: In early spring, some plants become infected with Puccinia monoica, a rust fungus that stops the rock cress from flowering and forces it to form the brilliant yellow pseudoflowers containing the reproductive structures of the rust fungus. See last group of photos below, taken at Mayflower Gulch and Georgia Pass, Summit County. For more information about the fungus, click here.
Colorado Status
Native



© Tom Lebsack 2017