Lappula squarrosa
Encyclopedia
Lappula squarrosa is a species of flowering plant in the borage family
known by several common names, including European stickseed, bluebur, and bristly sheepbur. It is native to Europe and Asia, where it is common, and it is an introduced species
in much of North America and Africa. It is well-known as a noxious weed where it is naturalized and also in many parts of its native range. This is an annual herb producing an erect stem often with sprays of many long, bending branches, its form varying in different regions and climates. The plant may approach a meter in height. The stems are lined with linear to oval leaves up to 5 centimeters long and coated in whitish hairs, and the herbage emits a scent generally considered unpleasant. The inflorescence
is a long, leafy raceme
of tiny flowers near the ends of the branches. Each flower is 2 to 4 millimeters wide with five light blue corolla lobes. White-flowered plants are occasionally seen. The fruit is a cluster of four nutlet
s which are coated in hooked prickles. The seeds are dispersed
when the prickles get caught on animal coats
and human clothing, and when they are moved by wind.
This plant grows easily in a wide range of habitat types, including agricultural fields, roadsides, gravel beds, and rocky waste places. It thrives in overgrazed pastures
.
Boraginaceae
Boraginaceae, the Borage or Forget-me-not family, include a variety of shrubs, trees, and herbs, totaling about 2,000 species in 146 genera found worldwide.A number of familiar plants belong to this family....
known by several common names, including European stickseed, bluebur, and bristly sheepbur. It is native to Europe and Asia, where it is common, and it is an introduced species
Introduced species
An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...
in much of North America and Africa. It is well-known as a noxious weed where it is naturalized and also in many parts of its native range. This is an annual herb producing an erect stem often with sprays of many long, bending branches, its form varying in different regions and climates. The plant may approach a meter in height. The stems are lined with linear to oval leaves up to 5 centimeters long and coated in whitish hairs, and the herbage emits a scent generally considered unpleasant. 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 long, leafy raceme
Raceme
A raceme is a type of inflorescence that is unbranched and indeterminate and bears pedicellate flowers — flowers having short floral stalks called pedicels — along the axis. In botany, axis means a shoot, in this case one bearing the flowers. In a raceme, the oldest flowers are borne...
of tiny flowers near the ends of the branches. Each flower is 2 to 4 millimeters wide with five light blue corolla lobes. White-flowered plants are occasionally seen. The fruit is a cluster of four nutlet
Nutlet
Nutlet may refer to one of the following.*A small nut.*In botany, a nutlet is a pyrena or pyrene, which is a seed covered by a stony layer, such as the kernel of a drupe....
s which are coated in hooked prickles. The seeds are dispersed
Seed dispersal
Seed dispersal is the movement or transport of seeds away from the parent plant. Plants have limited mobility and consequently rely upon a variety of dispersal vectors to transport their propagules, including both abiotic and biotic vectors. Seeds can be dispersed away from the parent plant...
when the prickles get caught on animal coats
Coat (animal)
Coat, or the nature and quality of a show mammal's pelage, is important to the animal fancy in the judging of the animal, particularly at conformation dog shows, cat shows and horse shows...
and human clothing, and when they are moved by wind.
This plant grows easily in a wide range of habitat types, including agricultural fields, roadsides, gravel beds, and rocky waste places. It thrives in overgrazed pastures
Overgrazing
Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, or by overpopulations of native or non-native wild animals.Overgrazing reduces the...
.