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Johnston's rockcress
Scientific Name: Arabis johnstonii
Family: Brassicaceae
Category: Dicot
Growth: Subshrub, Forb/herb
Duration: Perennial
Other Names:
Arabis johnstonii
Also known as Johnston's rockcress, this plant presents an interesting subject for exploration.
Taxonomy and Nomenclature
- Scientific Name: Arabis johnstonii Munz
- Common Name: Johnston's rockcress
- Family: Brassicaceae (Mustard Family)
- Synonym: Boechera johnstonii (Munz) Al-Shehbaz (Note: Arabis johnstonii is not considered an active name)
Distribution and Habitat
Johnston's rockcress is found in the San Jacinto Mountains in Riverside County, California. Its habitat includes chaparral and yellow pine forests. It can also be found in dry clay conglomerates fringing wet meadows.
Morphological Characteristics and Growth Habits
- Arabis johnstonii is described as a subshrub forb/herb.
- It is a perennial plant, meaning it lives for more than two years.
- Blooms between February and June.
Ecological Role
- Johnston's rockcress is a California Native Plant Society, California Rare Plant Rank 1B.2 species, indicating it is rare, threatened, or endangered in California and elsewhere. It is considered fairly threatened.
Interactions with Other Organisms
- The plant is found in areas where livestock grazing occurs.
Further Information
- Discover Life provides a page about the biology, natural history, ecology, identification, and distribution of Arabis johnstonii.
- Calflora provides information about its presence in California.
- United States Department of Agriculture (USDA) also provides information.