Bidens cernua

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Description

Leaves opposite, simple, linear to lanceolate, pointed at the tip, more or less rounded at the sessile or slightly clasping base, with or without teeth, smooth or hairy, up to 6" long, up to 1½" wide. Stem erect or sometimes growing along the ground and rooting at the nodes, smooth or hairy, often branched, up to 5' tall. Flowers many, crowded together into a head, the outer yellow and flat, the inner yellow and tubular, forming a disk, with several heads per plant, each head subtended by 5-8 narrow, leafy bracts. Sepals absent. Petals yellow; some united to form flat rays up to 2/3" long and 1/3" wide, others yellow, 5-lobed, united below into a tube. Flower heads are erect, but then become nodding with age. Stamens 5 Ovary inferior. Fruit an achene, mostly flat, broadest at top, tapering to a narrow base, green-black, barbed along the edge, up to 1/3" long, about 1/10" broad, with four stiff barbed awns at the upper end.

Taxonomy and Systematics

Kingdom: Plantae

Division: Magnoliophyta

Class: Magnoliophyta

Order: Asterales

Family: Asteraceae

Genus: Bidens L.

Species: Bidens cernua L.

Common Name: Nodding Beggar's Tick

Synonyms: Bidens cernua L. var. cernua nodding bur-marigold

Bidens cernua L. var. dentata (Nutt.) B. Boivin

Bidens cernua L. var. elliptica Wiegand

Bidens cernua L. var. integra Wiegand

Bidens cernua L. var. minima (Huds.) Pursh

Bidens cernua L. var. oligodonta Fernald & H. St. John

Bidens cernua L. var. radiata DC.

Bidens glaucescens Greene


Campus distribution and habitat

Flowers August-October around ponds and lakes, along streams, swamps, wet meadows, roadside ditches, marshes, bogs, and in areas of disturbed, wet soils.

General distribution

Bidenscernua.jpg

Native to U.S.

Other notes

Other common names include: Sticktight, Nodding Beggar's Ticks, Nodding Beggarsticks, Nodding Bur-Marigold

It is fairly easy to distinguish Nodding Bur-Marigold from other Bidens spp. because of its undivided leaves and achenes with 4 awns (rarely fewer)

Other resources

Citations

External links