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Bidens aristosa (Michx. ) Britton
WESTERN TICKSEED
Bearded beggarticks; Tickseed sunflower; Bidens polylepis

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Bidens aristosa, Midwestern Tickseed Sunflower
© Copyright Sheryl Pollock 2011 · 6
Bidens aristosa, Midwestern Tickseed Sunflower

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Bidens aristosa, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, whole plant - in flower - general view
Bidens aristosa, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, inflorescence - whole - unspecified

Bidens aristosa, inflorescence - ventral view of flower + perianth
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, inflorescence - ventral view of flower + perianth
Bidens aristosa, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, inflorescence - whole - unspecified

Bidens aristosa, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, leaf - basal or on lower stem
Bidens aristosa, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, leaf - on upper stem

Bidens aristosa, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, stem - showing leaf bases
Bidens aristosa, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Bidens aristosa, inflorescence - whole - unspecified

Bidens aristosa, leaf and flower
© Kay Yatskievych, 2003 · 1
Bidens aristosa, leaf and flower

Associates · map
FamilyScientific name @ source (records)
Megachilidae  Megachile petulans @ BBSL (1)
Miridae  Lygus lineolaris @ MEMU_ENT (4)
Peronosporaceae  Plasmopara halstedii @ BPI (1)

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Delaware Wildflowers

Plant ID 0234 not found

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Delaware Wildflowers  •  Scientific names

Bidens polylepis Blake Tick-seed Sunflower
Asteraceae — Aster family
Invasive native
Bidens polylepis
Lums Pond State Park
September 2001 Bidens polylepis
Lums Pond State Park
November 2003

Guide to Bidens of Delaware

Search Google Delaware USDA

Photos copyright David G. Smith

Information from the Delaware Flora Checklist used with author's permission.

Delaware Wildflowers main page

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FNA Vol. 21 Page 185, 206, 207, 214 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Bidens

15. Bidens aristosa (Michaux) Britton, Bull Torrey Bot. Club. 20: 281. 1893.

Coreopsis aristosa Michaux, Fl. Bor.-Amer. 2: 140. 1803; Bidens aristosa var. fritcheyi Fernald; B. aristosa var. mutica (A. Gray) Gattinger ex Fernald

Annuals, (15—)30—60(—150) cm. Leaves: petioles 10—30 mm; blades lanceolate to lance-linear overall, 30—80(—150) × 10—30(—50) mm, usually laciniately pinnatisect, primary lobes 3—7+, 15—60+ × 2—20 mm, bases cuneate, ultimate margins laciniate to serrate, ciliate, apices acuminate, faces glabrous or sparsely scabrellous. Heads in ± corymbiform arrays. Peduncles (10—)30—80+ mm. Calyculi of 8—12(—16) usually spreading to reflexed, linear, seldom foliaceous bractlets (4—)5—7(—12) mm, margins entire, ciliate, abaxial faces glabrous or ± scabrellous. Involucres ± hemispheric or broader, 6—8(—12) × 10—15 mm. Phyllaries 7—8(—13), lance-ovate to lance-linear, 6—8(—12) mm. Ray florets (5—)8—10+; laminae yellow, 10—25 mm. Disc florets (12—)20—40+; corollas yellowish, 2—3+ mm. Cypselae red-brown to blackish, ± flattened (unequally 3—4-angled), broadly cuneate, outer (4—)5—6 mm, inner 5—7 mm (lengths mostly 1.5—2.5 times widths), margins (± corky-winged) patently to antrorsely barbed, apices truncate to concave, faces weakly striate, sometimes tuberculate, glabrous or sparsely strigillose; pappi 0, or of 2(—4) spreading to divergent, antrorsely or retrorsely barbed awns (0.5—)2—4(—6) mm.

Flowering Aug—Oct(—Nov). Marshes, meadows, pine forests, disturbed sites; 0—300 m; Ont.; Ala., Ark., D.C., Ill., Ind., Ky., La., Md., Mich., Minn., Mo., N.C., S.C., Tenn., Tex., Va.

Updated: 2024-07-14 13:53:54 gmt
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