Bidens nashii Small
Helianthus laevis L.
Bidens laevis (L.) Britton Sterns & Poggenb.
Bur-marigolds, sticktights, smooth beggartick, smooth bidens, smooth bur marigold, larger bur marigold
Bur-marigolds are North American natives. They are found in saturated or flooded soils.
Plants: 2–3′ (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.
Habitats: Saturated or flooded soils.
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. 
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Some similar species. |
Online References:
Bidens elegans Greene
Bidens nashii Small
Helianthus laevis L.
Bidens nashii Small
Helianthus laevis L.
9/13/2020 · Mohawk River, Cohoes, New York · By John W. Kent 
9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 8 × 6″ (20 × 14 cm) 
9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 11 × 7″ (27 × 18 cm) 
9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts 
9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 14 × 12″ (34 × 29 cm) 
9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts 
9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 4 × 3½″ (11 × 8.8 cm) 
9/10/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 1½ × 1′ (52 × 34 cm) 
9/11/2010 · Nashua River Rail Trail, Groton Center, Groton, Massachusetts · ≈ 5 × 3½″ (13 × 9.2 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Bidens | From Latin bis, “twice,” and dens, “tooth,” for the pair of bristles on the achenes |
| Species | laevis | Smooth, free from hairs or roughness |
Bidens laevis description by Thomas H. Kent, not updated.
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