Habit: Conyza canadensis
is an herbaceous annual to 1.5 meters in height. The vegetative
structures are glabrous or covered with hirsute pubescence. The
sessile leaves are up to 10 cm long, linear to lanceolate, and
ciliate along the entire (sometimes toothed) margin and an acute leaf
The (zygomorphic and actinomorphic)
flowers are arranged in panicles of heads. The heads contain numerous
flowers and are subtended by an involucre composed of a series of
linear phyllaries. The calyx is modified as hairs forming a pappus.
There are both perfect (and actinomorphic) and imperfect (carpellate
and zygomorphic) flowers in the heads. The perfect flowers are in
the center of the head and imperfect around the edges of the heads.
The imperfect flowers have the corolla
fused into a single structure that opens along its inner edge. There
are no stamens. The ovary is inferior with a single locule and seed.
The perfect flowers have 5 fused, white petals. There are 5 stamens.
The ovary is inferior with a single locule and seed. The fruits are
an achene at maturity that is covered with bristles.
Habitat: Conyza canadensis
grows in human disturbed areas such as roadsides, abandoned fields
Distribution in Bahamas/Globally:
Conyza canadensis occurs on all island groups within the Bahamian
Archipelago as well as North America. It has become a weedy species
across the globe.
Medicinal/Cultural Economic usage:
Conyza canadensis has no known medicinal use in the Bahamas.