Rosa bridgesii
Encyclopedia
Rosa bridgesii is a species of rose
known by the common name pygmy rose. It is native to California
, where it grows in the forests of the Sierra Nevada and surrounding mountains and foothills. It may also occur in Oregon
.
This rose is sometimes treated as a variety of Rosa gymnocarpa
.
shrub
growing 10 to 80 centimeters tall. The brown stem is covered in paired prickles
. The leaves are each made up of a few hairy, glandular leaflets which are oval in shape and toothed. The leaflet at the end of the leaf is up to 3 centimeters long and has a flat tip.
The inflorescence
is a solitary flower or cyme of up to 5 flowers. The flower has five glandular sepal
s and five pink petals each up to 1.5 centimeters long. At the center are many stamen
s and up to 20 pistils
. The fruit is a rose hip
up to a centimeter wide.
Rose
A rose is a woody perennial of the genus Rosa, within the family Rosaceae. There are over 100 species. They form a group of erect shrubs, and climbing or trailing plants, with stems that are often armed with sharp prickles. Flowers are large and showy, in colours ranging from white through yellows...
known by the common name pygmy rose. It is native to 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 grows in the forests of the Sierra Nevada and surrounding mountains and foothills. It may also occur in Oregon
Oregon
Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
.
This rose is sometimes treated as a variety of Rosa gymnocarpa
Rosa gymnocarpa
Rosa gymnocarpa is a species of rose native to western North America. It is known by the common names wood rose, baldhip rose, and dwarf rose. It grows in shady, damp, and rich forests.-Description:...
.
Description
Rosa bridgesii is a small rhizomatousRhizome
In botany and dendrology, a rhizome is a characteristically horizontal stem of a plant that is usually found underground, often sending out roots and shoots from its nodes...
shrub
Shrub
A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...
growing 10 to 80 centimeters tall. The brown stem is covered in paired prickles
Thorns, spines, and prickles
In botanical morphology, thorns, spines, and prickles are hard structures with sharp, or at least pointed, ends. In spite of this common feature, they differ in their growth and development on the plant; they are modified versions of different plant organs, stems, stipules, leaf veins, or hairs...
. The leaves are each made up of a few hairy, glandular leaflets which are oval in shape and toothed. The leaflet at the end of the leaf is up to 3 centimeters long and has a flat tip.
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 a solitary flower or cyme of up to 5 flowers. The flower has five glandular sepal
Sepal
A sepal is a part of the flower of angiosperms . Collectively the sepals form the calyx, which is the outermost whorl of parts that form a flower. Usually green, sepals have the typical function of protecting the petals when the flower is in bud...
s and five pink petals each up to 1.5 centimeters long. At the center are many stamen
Stamen
The stamen is the pollen producing reproductive organ of a flower...
s and up to 20 pistils
Gynoecium
Gynoecium is most commonly used as a collective term for all carpels in a flower. A carpel is the ovule and seed producing reproductive organ in flowering plants. Carpels are derived from ovule-bearing leaves which evolved to form a closed structure containing the ovules...
. The fruit is a rose hip
Rose hip
The rose hip, or rose haw, is the fruit of the rose plant, that typically is red-to-orange, but ranges from dark purple to black in some species. Rose hips begin to form in spring, and ripen in late summer through autumn.-Usage:...
up to a centimeter wide.