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Cirsium brevistylum
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Indian Thistle
( Cirsium brevistylum )
Cirsium brevistylum
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Indian Thistle (Cirsium brevistylum)
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Cirsium brevistylum
is a species of thistle known by the common names Indian thistle and clustered thistle. It is native to western North America from southwestern British Columbia to California, where it grows in moist areas in many types of habitat, from mountain forests to chaparral and coastal marshes. This native thistle is annual or biennial, reaching two meters in height and known to exceed three meters at times. There is usually a single stem which may branch toward the top and is coated in hairs and webby fibers. The leaves are deeply cut into many lobes lined with twisted teeth, the longest leaves near the base of the plant reaching about 25 centimeters long. The leaves are borne on winged petioles with many spines. The flower cluster bears one to many flower heads, both at the ends of the stem branches and in the leaf axils. The flower head reaches about 3 centimeters long by 4 wide and is lined with cobwebby, bristly, spine-tipped phyllaries. The flower head is packed with white or pink flowers about 2 centimeters long. The fruit is a brown achene a few millimeters long topped with a pappus one to two centimeters in length.
Plant Description
Plant Type
Perennial herb
Size
6.6 - 9.8 ft tall
Flower Color
Pink, Purple
Wildlife Supported
Butterflies & moths hosted ( 15
likely
* )
SHOW ALL
*
Painted Lady
Vanessa cardui
Vanessa cardui
*
Mylitta Crescent
Phyciodes mylitta
Phyciodes mylitta
*
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
Sun
Part Shade
Common uses
Butterfly Gardens
Natural Setting
Site Type
Moist places
Climate
Annual Precipitation: 11.8" - 85.6", Summer Precipitation: 0.14" - 2.33", Coldest Month: 40.6" - 55.8", Hottest Month: 58.6" - 79.3", Humidity: 0.02" - 26.19", Elevation: -3" - 2290"
Alternative Names
Common Names
: Clustered Thistle
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Indian Thistle
Cirsium brevistylum
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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