| 词条 | Cirsium douglasii |
| 释义 |
|image = Cirsium douglasii (4695009378).jpg |genus = Cirsium |species = douglasii |authority = DC. |synonyms_ref = [1] |synonyms = {{collapsible list|bullets = true |title=Synonymy |Carduus undulatus var. douglasii (DC.) Greene |Cirsium breweri var. glutinosum Petr. |Cirsium breweri var. wrangelii Petr. |Cirsium breweri subsp. wrangelii Petr. |Carduus breweri (A.Gray) Greene, syn of var. breweri |Cirsium breweri (A.Gray) Jeps., syn of var. breweri |Cirsium breweri var. canescens Petr., syn of var. breweri |Cirsium breweri var. lanosissimum Petr., syn of var. breweri |Cirsium douglasii var. canescens (Petr.) J.T.Howell, syn of var. breweri |Cnicus breweri A.Gray, syn of var. breweri |}}}}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] DescriptionThis native thistle, Cirsium douglasii, is a biennial or short-lived perennial herb growing up to {{convert|2.5|m|ft}} tall, with a branching woolly stem. The longest gray-tomentose leaves, located about the base of the plant, are up to {{convert|1|m|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 {{convert|3|cm|in}} long and lined with purple-tipped spiny phyllaries. The head contains purple or white flowers. The fruit is a dark-colored achene {{convert|2|-|4.5|mm|in}} long/diameter with a pappus which may reach {{convert|2|cm|in}} in length.[6]
References1. ^1 The Plant List, Cirsium douglasii DC. 2. ^{{cite web|url=http://www.calflora.org/cgi-bin/specieslist.cgi?where-genus=Cirsium|title=Cirsium douglasii_EOL}} 3. ^{{cite web|url=http://www.calflora.org/cgi-bin/specieslist.cgi?where-genus=Cirsium|title=Calflora_genus: Cirsium}} 4. ^Biota of North America Program 2014 county distribution map 5. ^Calflora taxon report, University of California, Cirsium douglasii DC., Douglas' thistle, swamp thistle 6. ^1 Flora of North America: Cirsium douglasii External links
6 : Cirsium|Flora of the Western United States|Natural history of the California chaparral and woodlands|Natural history of the California Coast Ranges|Natural history of the San Francisco Bay Area|Plants described in 1838 |
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