Beggarticks, Nodding, Bidens cernua

Life Cycle

Annual

Propagation

Reproducing only by seed.

Stems

Stems erect, branched and 10-100cm high.

Leaves

Opposite (2 per node - Figure 3), compound with 5 leaflets and sharply toothed.

Flowers and Fruit

Flower heads showy, 2.5-5cm across, ray florets (a) bright yellow, up to 1.5cm long, usually 8 per head but occasionally fewer or absent altogether. The disk florets (b) are yellowish-green and densely crowded together. The flower head is surrounded by several, long, leafy, green involucral bracts (c). The seeds are brownish, flat, long-oval, with 2 downward-barbed awns (d) on top (Figure 5). Flowers from July to late autumn.

Habitat

Nodding beggarticks occurs throughout Ontario in moist places, usually in meadows, river valleys, roadside ditches, and depressions in cultivated land.

Distinguishing Features

It is distinguished by its opposite undivided leaves, its large flower heads with usually 8 yellow ray florets and long, leafy, green involucral bracts, and its seeds with 2 downward-barbed awns.


Figure #1.

A: Nodding beggarticks - top of flowering stem (B & C: Tall beggarticks - top of flowering stem and "seed")


Figure #2.

Cotlyedon


Figure #3.

Seedling


Figure #4.

Stem


Figure #5.

Leaf


Figure #6.

Seeds