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Cirsium douglasii
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Douglas' Thistle
( Cirsium douglasii )
Cirsium douglasii
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Douglas' Thistle (Cirsium douglasii)
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Cirsium douglasii
is a species of thistle known by the common names Douglas' thistle and California swamp thistle. It is native to the central coast and northern California ranges, foothills, and plateaus, and adjacent parts of southern Oregon and northwest Nevada. It grows in wet places in a number of types of habitat. 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. 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. Varieties
Cirsium douglasii
var. breweri (A. Gray) D. J. Keil & C. E. Turner - California, Oregon, Nevada
Cirsium douglasii
var. douglasii - California
Plant Description
Plant Type
Perennial herb
Size
6.6 - 16.4 ft tall
Flower Color
Pink, Purple
Wildlife Supported
Butterflies & moths hosted ( 1
confirmed
, 13
likely
* )
SHOW ALL
Mylitta Crescent
Phyciodes mylitta
Phyciodes mylitta
*
Painted Lady
Vanessa cardui
Vanessa cardui
*
California Crescent
Phyciodes orseis
Phyciodes orseis
*
Bilobed Looper Moth
Megalographa biloba
Megalographa biloba
*
Sweetclover Root Borer Moth
Walshia miscecolorella
Walshia miscecolorella
*
Garden Webworm Moth
Achyra rantalis
Achyra rantalis
*
Southern Emerald
Synchlora frondaria
Synchlora frondaria
Landscaping Information
Common uses
Butterfly Gardens
Natural Setting
Climate
Annual Precipitation: 11.7" - 137.4", Summer Precipitation: 0.26" - 4.08", Coldest Month: 27.9" - 49.9", Hottest Month: 49.0" - 74.4", Humidity: 0.03" - 23.44", Elevation: 23" - 10161"
Alternative Names
Common Names
: California Swamp Thistle
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Douglas' Thistle
Cirsium douglasii
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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