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second rockcress
Scientific Name: Arabis holboellii var. retrofracta
Family: Brassicaceae
Category: Dicot
Growth: Forb/herb
Duration: Biennial, Perennial
Other Names: MN (Holboell's rockcress)
Second Rockcress (Boechera retrofracta)
Second Rockcress, scientifically known as Boechera retrofracta, is also commonly referred to as Holboell's Rockcress.
Taxonomy and Nomenclature
- Scientific Name: Boechera retrofracta (Graham) A. Lve & D. Lve
- Synonyms:
- Arabis holboellii Hornem. var. retrofracta (Graham) Rydb.
- Arabis holboellii var. retrofracta
- Arabis exilis A. Nelson
- Kingdom: Plantae
- Taxonomic Rank: Variety
- Family: Brassicaceae (Mustard Family)
Distribution and Habitat
Second Rockcress can be found in various locations, including:
- Yosemite National Park, Mariposa Co., California
- Bryce Canyon National Park, Garfield Co., Utah
- Death Valley National Park, Inyo Co., California
- Great Basin National Park, White Pine Co., Nevada
Morphological Characteristics and Growth Habits
- Rock Cress blooms in the spring of the second year after planting, and every year afterward.
- During the second year, a flowering stalk develops up to 3 feet tall, which is unbranched or sparingly branched and often leans to one side. This stalk is pale green.
- It grows from a taproot and is biennial, meaning it has a two-year life cycle.
Additional Information
- Regular pruning to remove dead flowers encourages a second flowering and keeps the plant tidy.
- The plant is strongly drought-hardy.
Quirky Facts
- McDonald's rockcress was the second plant listed as Endangered under the United States Federal law.