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Bidens laevis (L.) Britton Sterns & Poggenb.

Bidens elegans Greene

Bidens nashii Small

Helianthus laevis L.

Bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusBidensFrom Latin bis, “twice,” and dens, “tooth,” for the pair of bristles on the achenes
SpecieslaevisSmooth, free from hairs or roughness

About plant names...

Bur-marigolds are North American natives. They are found in saturated or flooded soils.

Plants: 24-36" (60-91 cm) high, rarely up to 6' (1.8 m). Plants and flowers tend to look disheveled.

Leaves: 1½-8" (3.8-20 cm) long, narrow, with coarse (dentate or serrate) teeth. They vary in shape from obovate or elliptic to lanceolate or linear.

Flowers: Yellow flowers are 1½-2½" (3.8-6.3 cm) around, with 8 petals. Each is a composite flower. They bloom from July to October.

Fruits: Seeds have barbed tips, which hitchhike on passers-by to find new locations.

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

From Britton, Nathaniel Lord, and Brown, Addison, An illustrated flora of the northern United States, Canada and the British Possessions, 1913. Courtesy of USDA-NRCS Plants Database.

These are similar:

 

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/13/2020 · Mohawk River, Cohoes, NY · By John W. Kent

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 9 × 6" (23 × 15 cm)

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 11 × 7" (27 × 18 cm)

 
Bidens cernua

Bidens frondosa
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Bidens laevis
Common Name

nodding beggartick

devil’s beggartick

bur-marigolds
Plant Up to 13' (4 m) high, usually less than 3' (91 cm) 12-36" (30-91 cm) high, rarely up to 6' (1.8 m). Stems are square in cross-section, nearly hairless, and light green, reddish green, or purple 24-36" (60-91 cm) high, rarely up to 6' (1.8 m). Plants and flowers tend to look disheveled.
Flowers Composite flowers are 1-2" (2.5-5 cm) across, have up to 8 petals, though rarely the ray flowers are missing and only the tubular disk flowers are present. The flowers are sideways-facing, rather than upward-facing Each composite flower is composed of 20-60 orange-yellow disc florets about ⅜-½" (9.5-12 mm) around, and rarely a few yellow rays, each ¹/₁₆-⅛" (2-3.5 mm) long. They are encompassed in 6-10 phyllaries, like a rosette of small leaves. Flowers occur in groups of 1-12, appearing from late summer to early fall. Yellow flowers are 1½-2½" (3.8-6.3 cm) around, with 8 petals. Each is a composite flower. They bloom from July to October.
Leaves Opposite, and sessile or clasping—leaf bases wrap around the stem. Leaves are 1½-8" (4-20 cm) long × up to 1" (2.5 cm) wide, and simple (unlobed) Lower leaves are odd pinnate clusters on long petioles, in opposite pairs; upper leaves may be alternate. Leaves are up to 3" (7.6 cm) × 1" (2.5 cm), coarsely toothed, deltate or lanceolate. 1½-8" (3.8-20 cm) long, narrow, with coarse (dentate or serrate) teeth. They vary in shape from obovate or elliptic to lanceolate or linear
Fruit Fruits are brown, hard, and triangular in shape, with four barbed spears of roughly equal length called awns The seeds or achenes are shaped like a narrow triangle, with two barbed fork tips that attach to fur or clothes. The seeds are also distributed by the wind. Seeds have barbed tips, which hitchhike on passers-by to find new locations.
Range/ Zones

Habitats Near shorelines and the edges of wetlands, in sandy or mucky soil Moist woods, meadows, thickets, fields, roadsides, railroads, borders of streams, ponds, sloughs, swamps, ditches Saturated or flooded soils
Type Wild Wild Wild
Occurrence   Common  

 

Online References:

Bidens laevis on Southeastern Flora, the Southeastern U.S. Plant Identification Resource

Bidens laevis on www.jeffpippen.com

Bidens laevis at the Lady Bird Johnson Wildflower Center

Bidens laevis on Hortipedia

Bidens laevis on CalPhotos

Bidens laevis at the Clemson Cooperative Extension

Bidens laevis on eFloras

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 21 × 31" (52 × 78 cm)

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 17 × 12" (44 × 29 cm)

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 3½ × 2½' (1.2 × 0.8 m)

Bidens laevis description by Thomas H. Kent, last updated 17 Sep 2020.

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Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 5 × 3½" (12 × 9.7 cm)

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 21 × 14" (52 × 34 cm)

Bidens laevis (bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold)

9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 5 × 3½" (13 × 9.2 cm)

Range:

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