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Overview

Distribution

Localities documented in Tropicos sources

Bidens helianthoides Kunth:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

Bidens nashii Small:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

Bidens laevis (L.) Britton, Sterns & Poggenb.:
Argentina (South America)
Brazil (South America)
Chile (South America)
Mexico (Mesoamerica)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Annuals (sometimes persisting), (10–)20–60(–120+) cm. Leaves (sometimes in 3s or 4s) sessile; blades obovate or elliptic to lanceolate or linear, (20–)50–100(–160+) × (5–)10–25(–40+) mm, bases cuneate to rounded, margins usually coarsely dentate to serrate, sometimes ciliate, apices acute to acuminate, faces glabrous. Heads (erect at flowering, sometimes nodding in fruit) borne singly or in open, ± corymbiform arrays. Peduncles (10–)20–60 mm. Calyculi of 5–7(–9+) erect or spreading to reflexed, oblanceolate or lanceolate to linear, often foliaceous bractlets or bracts (6–)10–12(–20+) mm, margins usually ciliate, abaxial faces glabrous or bases hispidulous. Involucres turbinate to hemispheric or broader, (4–)6–8(–10+) × 8–12+ mm. Phyllaries 8–12, ovate or obovate to lance-oblong, (4–)6–8(–10+) mm (tips often orange to purplish, as are tips of paleae). Ray florets usually 7–8, rarely 0; laminae orange-yellow, (10–)15–25(–30) mm. Disc florets (25–)60–100(–150+); corollas yellow to orange-yellow, 3–6.5 mm. Cypselae blackish, red-brown, or stramineous, obcompressed, flattened or unequally 3–4-angled, ± cuneate, outer 6–8 mm, inner 8–10 mm, margins retrorsely ciliate or barbed, apices ± truncate to convex, faces ± 1-nerved, ± striate, glabrous; pappi of 2–4 ± erect, retrorsely barbed awns 3–5 mm. 2n = 22, 24.
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Diagnostic Description

Synonym

Helianthus laevis Linnaeus, Sp. Pl. 2: 906. 1753; Bidens chrysanthemoides Michaux; B. helianthoides Kunth; B. nashii Small; B. quadriaristata de Candolle
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Type Information

Syntype for Bidens parryi Greene
Catalog Number: US 46659
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): W. Emory, C. C. Parry, J. M. Bigelow, C. Wright & A. C. V. Schott
Year Collected: 1855
Locality: Valley of Rio Grande, below Donana., Chihuahua, Mexico, North America
  • Syntype: Greene, E. L. 1901. Pittonia. 4: 265.
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Syntype for Bidens parryi Greene
Catalog Number: US 46660
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Sex/Stage: ; Flowering
Preparation: Pressed specimen
Collector(s): E. Palmer
Year Collected: 1879
Locality: SW Texas., Texas, United States, North America
  • Syntype: Greene, E. L. 1901. Pittonia. 4: 265.
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Holotype for Bidens elegans Greene
Catalog Number: US 357031
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): T. H. Kearney
Year Collected: 1898
Locality: Northwest., Norfolk, Virginia, United States, North America
  • Holotype: Greene, E. L. 1901. Pittonia. 4: 254.
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Type collection for Bidens nashii Small
Catalog Number: US 252408
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): G. V. Nash
Year Collected: 1895
Locality: Tallahassee., Leon, Florida, United States, North America
  • Type collection: Small, J. K. 1898. Bull. Torrey Bot. Club. 25: 481.
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Type fragment for Bidens speciosa Parish
Catalog Number: US 669818
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): S. B. Parish
Year Collected: 1899
Locality: San Bernardino., San Bernardino, California, United States, North America
  • Type fragment: Parish, S. B. 1900. Zoe. 5: 75.
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Isosyntype for Bidens expansa Greene
Catalog Number: US 214688
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): S. B. Parish
Year Collected: 1893
Locality: San Bernardino., San Bernardino, California, United States, North America
  • Isosyntype: Greene, E. L. 1901. Pittonia. 4: 266.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Bidens laevis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Bidens laevis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Bidens laevis

Bidens laevis is a species of flowering plant in the daisy family known by the common names bur-marigold and smooth beggarticks. It is native to the southern half of the United States, where it grows in wetlands, including estuaries and riverbanks. It is similar in appearance to its relative Bidens cernua and the two are sometimes confused. This is an annual or perennial herb growing over 20 centimeters tall and sometimes much taller, exceeding one meter in height and sometimes approaching two. The narrow lance-shaped leaves are 5 to 15 centimeters long, with finely toothed edges and pointed tips. The inflorescence bears one or more flower heads which bend down as they become heavy with fruit after flowering. Each head has a center of yellow disc florets and a fringe of 7 or 8 yellow ray florets each up to 3 centimeters long. The fruit is a sharply barbed achene.

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Notes

Comments

Bidens laevis and B. cernua are similar in gross appearance; specimens of one are sometimes misidentified as the other. Perhaps they represent extremes of a single species.
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