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Cirsium hookerianum Nutt.
Life   Plantae   Dicotyledoneae   Asteraceae   Cirsium

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FamilyScientific name @ source (records)
Apidae  Bombus flavifrons @ BBSL (1)

Bombus insularis @ BBSL (1)
Pucciniaceae  Puccinia laschii @ BPI (1)

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Cirsium hookerianum Nutt.
white thistle

General Information
Symbol: CIHO
Group: Dicot
Family: Asteraceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : CAN   N
L48   N
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Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   





Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae ⁄ Compositae – Aster family
Genus Cirsium Mill. – thistle
Species Cirsium hookerianum Nutt. – white thistle

Subordinate Taxa

This plant has no children

Legal Status

Noxious Weed Information
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds .
Arkansas Cirsium
thistle Noxious weed
Iowa Cirsium
thistle Primary noxious weed

Wetland Status

Interpreting Wetland Status

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Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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Following modified from Flora of North America
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Link to Flora of North America home
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FNA Vol. 19, 20 and 21 Page 100, 101, 102, 121, 126, 148 , 149 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Cirsium

48. Cirsium hookerianum Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 418. 1841.

Hooker's or white thistle

Cirsium kelseyi (Rydberg) Petrak

Biennials or monocarpic (sometimes polycarpic?) perennials , 20—150 cm; taprooted. Stems usually 1 and erect, less commonly several and ascending, simple to sparingly short-branched in distal 1 /2, variably villous with jointed trichomes, and/or finely arachnoid, or ± glabrate; branches on distal stems 0—many, short, ascending. Leaves: blades linear-oblong to elliptic, 5—25 × 1—8 cm, subentire to coarsely dentate or deeply pinnatifid, lobes lance-oblong to broadly triangular, spinulose to spiny-dentate or shallowly lobed, main spines 2—10 mm, abaxial faces usually ± densely gray- or white-tomentose with felted arachnoid trichomes, ± villous to tomentose along major veins with septate trichomes, sometimes glabrous or glabrate, adaxial ± green, glabrous to thinly arachnoid, often ± villous or tomentose with septate trichomes; basal often present at flowering, spiny winged-petiolate or sessile; principal cauline well distributed, proximally winged-petiolate, distally sessile, gradually reduced, bases sometimes short-decurrent; distal ± reduced, often narrower than proximal, sometimes with non-pigmented bases, sometimes pectinately spiny. Heads 1—many, borne singly or crowded in spiciform, racemiform, subcapitate, or sometimes more openly branched corymbiform arrays. Peduncles 0—8+ cm. Involucres (green or often purplish), broadly ovoid, 2—3.3 × 1.5—4 cm, loosely to densely villous with septate trichomes to tomentose and/or arachnoid. Phyllaries in 4—8 series, imbricate to subequal, bases short-appressed, entire, abaxial faces with or without narrow glutinous ridge, apices stiffly spreading to ascending, linear, long, plane, spines straight, slender, 3—5 mm; apices of inner flexuous, sometimes expanded and erose. Corollas white, ochroleucous, or occasionally pink, 20—28 mm, tubes 10—13 mm, throats 6.5—9 mm, lobes 5—7 mm; style tips 3—5.5 mm. Cypselae dark brown, 5—6.5 mm, apical collars not differentiated; pappi 18—22 mm. 2 n = 34.

Flowering summer (Jun—Sep). Moist soil, grasslands, aspen parkland, forest edges and openings, subalpine, alpine meadows; 600—2900 m; Alta., B.C.; Idaho, Mont., Wash., Wyo.

Cirsium hookerianum occurs from the Canadian Coast Ranges of British Columbia east to the northern Cascade Range and the northern Rocky Mountains. The relationship between C. hookerianum, C. kelseyi , which I have tentatively included in C. hookerianum , and C. longistylum needs further investigation. A case could be made for including all three in an expanded concept of C. hookerianum , but more investigation of the variation patterns is needed before this is done. Certainly C. kelseyi is better treated within or as a close ally of C. hookerianum than in C. scariosum (var. scariosum ), where R. J. Moore and C. Frankton (1974) synonymized it. Cirsium hookerianum is known to hybridize with C. undulatum .

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Cirsium+hookerianum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Cirsium+hookerianum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 9
Query: SELECT * FROM img WHERE ready=1 and taxon like "Cirsium hookerianum%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Cirsium hookerianum
Cirsium hookerianum
Hooker Thistle
ID: 0024 3291 1997 0077 [detail]
Charles Webber
© 2000 California Academy of Sciences

Cirsium hookerianum
Cirsium hookerianum
White Thistle
ID: 0000 0000 0809 2283 [detail]
© 2009 Barry Breckling

Cirsium hookerianum
Cirsium hookerianum
ID: 0000 0000 0912 0937 [detail]
© 2012 RT Hawke

Cirsium hookerianum
Cirsium hookerianum
ID: 0000 0000 0912 0938 [detail]
© 2012 RT Hawke

Cirsium hookerianum
Cirsium hookerianum
Hooker's Thistle
ID: 0000 0000 0313 3534 [detail]
© 2013 Wynn Anderson

Cirsium hookerianum
Cirsium hookerianum
Hooker's Thistle
ID: 0000 0000 0313 3536 [detail]
© 2013 Wynn Anderson

Cirsium hookerianum
Cirsium hookerianum
Hooker's Thistle
ID: 0000 0000 0313 3540 [detail]
© 2013 Wynn Anderson

Cirsium hookerianum
Cirsium hookerianum
Hooker's Thistle
ID: 0000 0000 0313 3539 [detail]
© 2013 Wynn Anderson

Cirsium hookerianum
Cirsium hookerianum
Hookers Thistle
ID: 0000 0000 0813 2735 [detail]
© 2013 Jason Matthias Mills

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