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Cirsium hydrophilum
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Suisun Thistle
( Cirsium hydrophilum )
Cirsium hydrophilum
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Suisun Thistle (Cirsium hydrophilum)
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Cirsium hydrophilum
is a species of thistle which is endemic to California, where it is found only in the San Francisco Bay Area and the Sacramento-San Joaquin River Delta. This native thistle grows in wet boggy habitats.
Cirsium hydrophilum
may reach 2 metres (6. 6 ft) in height with a branching, cobwebby stem. The leaves are longest near the base of the plant, approaching 90 centimetres (35 in) in length. They are cut into toothed lobes and covered in spines, particularly along the petiole. The inflorescence bears one or more flower heads, each up to 3 centimetres (1. 2 in) long. The head is lined with sticky, twisted, spiny phyllaries and contains pink to purple flowers. The fruit is an achene a 2-4 millimetres (0. 079-0. 157 in) long topped with a pappus of about 1. 5 centimetres (0. 59 in) centimeters. Varieties: There are two very localized varieties:The rare
Cirsium hydrophilum
var. hydrophilum, the Suisun thistle, is known from two occurrences in the Suisun Marsh, in the salt marsh habitat of the Delta in Solano County. It is treated as a federally listed endangered species. The very rare
Cirsium hydrophilum
var. vaseyi, Mt. Tamalpais thistle or Vasey's thistle, is known from about twenty occurrences on Mount Tamalpais in Marin County, in Vacaville, California in Solano County, and inside the Presidio in the City of San Francisco. It is currently not a listed federal or state endangered species.
Plant Description
Plant Type
Perennial herb
Size
6.6 ft tall
Flower Color
Pink, Purple
Wildlife Supported
Butterflies & moths hosted ( 1
confirmed
, 8
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
*
Oblique-Banded Leafroller Moth
Choristoneura rosaceana
Choristoneura rosaceana
*
Sunflower Moth
Homoeosoma electella
Homoeosoma electella
*
Artichoke Plume Moth
Platyptilia carduidactyla
Platyptilia carduidactyla
Landscaping Information
Natural Setting
Climate
Annual Precipitation: 19.8" - 64.4", Summer Precipitation: 0.23" - 0.46", Coldest Month: 46.7" - 50.9", Hottest Month: 62.7" - 72.5", Humidity: 1.37" - 18.29", Elevation: 4" - 2553"
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Suisun Thistle
Cirsium hydrophilum
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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