Cirsium douglasii
| Cirsium douglasii | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Cirsium |
| Species: | C. douglasii
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| Binomial name | |
| Cirsium douglasii | |
| Synonyms[1] | |
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Synonymy
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Cirsium douglasii is a species of thistle known by the common names Douglas' thistle and California swamp thistle.[2][3]
It is native to the central coast and northern California ranges, foothills, and plateaus, and adjacent parts of southern Oregon and northwest Nevada.[4] It grows in wet places in a number of types of habitat.[5]
Description[edit]
This native thistle, Cirsium douglasii, is a biennial or short-lived perennial herb growing up to 2.5 metres (8.2 ft) tall, with a branching woolly stem. The longest gray-tomentose leaves, located about the base of the plant, are up to 1 metre (3.3 ft) long. They are sometimes lobed or toothed and are borne on a spiny petiole.[6]
The inflorescence is a cluster of several flower heads surrounded by small leaves. Each flower head is up to 3 centimetres (1.2 in) long and lined with purple-tipped spiny phyllaries. The head contains purple or white flowers. The fruit is a dark-colored achene 2–4.5 millimetres (0.079–0.177 in) long/diameter with a pappus which may reach 2 centimetres (0.79 in) in length.[6]
- Varieties[1]
- Cirsium douglasii var. breweri (A.Gray) D.J.Keil & C.E.Turner - California, Oregon, Nevada
- Cirsium douglasii var. douglasii - California
References[edit]
- ^ a b The Plant List, Cirsium douglasii DC.
- ^ "Cirsium douglasii_EOL".
- ^ "Calflora_genus: Cirsium".
- ^ Biota of North America Program 2014 county distribution map
- ^ Calflora taxon report, University of California, Cirsium douglasii DC., Douglas' thistle, swamp thistle
- ^ a b Flora of North America: Cirsium douglasii
External links[edit]
Media related to Cirsium douglasii at Wikimedia Commons- Jepson Manual treatment — Cirsium douglasii
- Cirsium douglasii — Calphotos Photos gallery, University of California
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