Agoseris heterophylla
Encyclopedia
Agoseris heterophylla is a liguliferous species in the Asteraceae
or sunflower
family known by the common name annual agoseris. It is widespread in mostly drier regions of western North America. This is an annual herb producing a basal rosette
of leaves. Often there is no stem, or a short, rudimentary stem may develop, although the plant will produce several stem-like peduncles
. Each flower head contains yellow ray florets, but no disc florets. The fruit is an achene
which can be highly variable but typically has a long beak and a terminal pappus
of white bristles.
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
or sunflower
Sunflower
Sunflower is an annual plant native to the Americas. It possesses a large inflorescence . The sunflower got its name from its huge, fiery blooms, whose shape and image is often used to depict the sun. The sunflower has a rough, hairy stem, broad, coarsely toothed, rough leaves and circular heads...
family known by the common name annual agoseris. It is widespread in mostly drier regions of western North America. This is an annual herb producing a basal rosette
Rosette (botany)
In botany, a rosette is a circular arrangement of leaves, with all the leaves at a single height.Though rosettes usually sit near the soil, their structure is an example of a modified stem.-Function:...
of leaves. Often there is no stem, or a short, rudimentary stem may develop, although the plant will produce several stem-like peduncles
Peduncle (botany)
In botany, a peduncle is a stem supporting an inflorescence, or after fecundation, an infructescence.The peduncle is a stem, usually green and without leaves, though sometimes colored or supporting small leaves...
. Each flower head contains yellow ray florets, but no disc florets. The fruit is an achene
Achene
An achene is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate and indehiscent...
which can be highly variable but typically has a long beak and a terminal pappus
Pappus (flower structure)
The pappus is the modified calyx, the part of an individual disk, ray or ligule floret surrounding the base of the corolla, in flower heads of the plant family Asteraceae. The pappus may be composed of bristles , awns, scales, or may be absent. In some species, the pappus is too small to see...
of white bristles.
Varieties
- Agoseris heterophylla var. cryptopleura
- Agoseris heterophylla var. heterophylla
- Agoseris heterophylla var. quentinii