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Cirsium horridulum Michx.
YELLOW THISTLE
Life   Plantae   Dicotyledoneae   Asteraceae   Cirsium

Cirsium horridulum
© Les Mehrhoff, 2008-2010 · 5
Cirsium horridulum

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Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum
Cirsium horridulum
© Copyright Bobby Hattaway 2011 · 5
Cirsium horridulum

Associates · map
FamilyScientific name @ source (records)
Aphididae  Capitophorus elaeagni @ NCSU_ENT (10)
Apidae  Anthophora occidentalis @ BBSL (1)

Bombus bimaculatus @ UCMS_ENT (2)
Delphacidae  Pissonotus nitens @ UDCC_TCN (4)
Halictidae  Agapostemon virescens @ UCMS_ENT (3)

Halictus ligatus @ UCMS_ENT (2)

Lasioglossum coriaceum @ UCMS_ENT (1)
Megachilidae  Coelioxys rufitarsis @ UCMS_ENT (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Cirsium horridulum Michx. var. horridulum Yellow Thistle
Asteraceae — Aster family
Native
Cirsium horridulum var. horridulum Cirsium horridulum var. horridulum
The yellow color is more common. Thompsons Bridge Road
June 2008

Guide to Cirsium of Delaware

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=CIHO2 ---> https://plants.usda.gov/java/profile?symbol=CIHO2
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://plants.usda.gov/java/profile?symbol=CIHO2

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 99, 113, 114 , 115 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Cirsium

11. Cirsium horridulum Michaux, Fl. Bor.-Amer. 2: 90. 1803.

Bristly or horrid or yellow or bull thistle

Biennials or perennials , (± fleshy), 15—250 cm; stout taproots and a fascicle of fleshy lateral roots, often perennating by root sprouts. Stems 1—several, usually erect, often stout, glabrous to densely tomentose; branches 0—many, spreading to ascending, short, stout. Leaves : blades linear to oblanceolate or oblong-elliptic, 10—40 × 2—10 cm, unlobed and spiny-dentate to deeply pinnatifid, lobes spiny-dentate or coarsely lobed, main spines stout, 5—30 mm, abaxial faces subglabrous to loosely tomentose, adaxial glabrous to ± densely villous with septate trichomes; basal present at flowering, spiny winged-petiolate, bases often tapered; principal cauline sessile, well distributed, often not much reduced distally, bases often ± auriculate-clasping; distal cauline often spinier than the proximal. Heads 1—20 in subcapitate to corymbiform arrays (each closely subtended by an involucre-like ring of spiny-margined bracts). Peduncles 0—5 cm. Involucres hemispheric to campanulate, 3—5 × 3—8 cm. Phyllaries in 5—9 series, subequal to imbricate, light green to stramineous, lanceolate to linear, distally often with reddish margins, abaxial faces without glutinous ridge, often ± thinly tomentose, often scabridulous in submarginal bands; outer and middle appressed-ascending, bodies usually reddish-tinged, margins setulose-ciliolate, apices acuminate, spines 1—2 mm, weak; apices of inner straight, flat. Corollas white to yellow, pink, purple, or red, 30—47 mm, tubes 11—30 mm, throats 6—10 mm, lobes 7—10 mm; style tips 3—5 mm. Cypselae straw-colored to tan, 4—6 mm, apical collars weakly differentiated; pappi 25—35 mm. 2 n = 32, 33, 34, 35.

Varieties 4 (3 in the flora): e United States, Mexico.

Although several variants have been given taxonomic recognition as species, these seem at most races. Flower color varies greatly, sometimes within populations and sometimes on a populational or regional basis. Herbarium specimens are sometimes difficult to assign to variety.

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Cirsium+horridulum&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+horridulum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Cirsium+horridulum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2017-11-22 06:43:52 gmt
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