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snowy thistle
Scientific Name: Cirsium occidentale var. candidissimum
Family: Asteraceae
Category: Dicot
Growth: Forb/herb
Duration: Biennial
Other Names:
Cirsium vulgare and Cirsium occidentale var. candidissimum
This page provides information on two distinct thistles: Cirsium vulgare (bull thistle, common thistle, or spear thistle) and Cirsium occidentale var. candidissimum (snowy thistle or snowwool thistle).
Considerations for Pets
- Cirsium vulgare is a thistle and may have sharp spines or prickles.
Considerations for Children
- Cirsium vulgare is a thistle and may have sharp spines or prickles.
Taxonomy and Nomenclature
- Cirsium vulgare:
- Common names: bull thistle, common thistle, spear thistle
- Cirsium occidentale var. candidissimum:
- Common names: Snowy thistle, Snowwool thistle
- Synonym: Cirsium pastoris
Distribution and Habitat
- Cirsium occidentale var. candidissimum is found in Siskiyou County, CA, and its origin in the United States is currently unknown/undetermined.
Ecological Role
- Thistles (unspecified species, potentially including Cirsium vulgare and Cirsium occidentale) are described as troublesome invasive weeds in Nevada.
Morphological Characteristics
- Cirsium occidentale var. candidissimum is described as having an erect single stem. Its basal leaves are deciduous and densely white with matted woolly hairs. The leaves are oblong and pinnately lobed.
Further Information
- Dave's Garden is mentioned as a resource for gardening tips and ideas.
- The Lady Bird Johnson Wildflower Center is mentioned as a resource focused on native plants.