Calycadenia villosa
Encyclopedia
Calycadenia villosa is a species of flowering plant in the daisy family
known by the common name dwarf western rosinweed. It is endemic to central California
, where it is known from a limited distribution in the Central Coast Ranges from southern Monterey County
to northern San Luis Obispo County
. There are perhaps 16 occurrences. This is an annual herb producing a very hairy erect stem approaching 40 centimeters in maximum height. The leaves are linear in shape and up to 5 centimeters long. The inflorescence
is made up of clusters of flower heads
surrounded by gland-tipped bract
s. Each flower head is a hairless bunch of small disc florets and 1 to 4 white to pink ray florets. Each ray floret has three lobes, the middle lobe being narrowest. The fruit is an achene
; those developing from disc florets bear a pappus
of scales.
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...
known by the common name dwarf western rosinweed. It is endemic to central California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, where it is known from a limited distribution in the Central Coast Ranges from southern Monterey County
Monterey County, California
Monterey County is a county located on the Pacific coast of the U.S. state of California, its northwestern section forming the southern half of Monterey Bay. The northern half of the bay is in Santa Cruz County. As of 2010, the population was 415,057. The county seat and largest city is Salinas...
to northern San Luis Obispo County
San Luis Obispo County, California
San Luis Obispo County is a county located along the Pacific Ocean in the Central Coast of the U.S. state of California, between Los Angeles and the San Francisco Bay Area. As of the 2010 census its population was 269,637, up from 246,681 at the 2000 census...
. There are perhaps 16 occurrences. This is an annual herb producing a very hairy erect stem approaching 40 centimeters in maximum height. The leaves are linear in shape and up to 5 centimeters long. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
is made up of clusters of flower heads
Head (botany)
The capitulum is considered the most derived form of inflorescence. Flower heads found outside Asteraceae show lesser degrees of specialization....
surrounded by gland-tipped bract
Bract
In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale. Bracts are often different from foliage leaves. They may be smaller, larger, or of a different color, shape, or texture...
s. Each flower head is a hairless bunch of small disc florets and 1 to 4 white to pink ray florets. Each ray floret has three lobes, the middle lobe being narrowest. 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...
; those developing from disc florets bear a 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 scales.