''Cytisus scoparius'' ( syn. ''Sarothamnus scoparius''), the common broom or Scotch broom, is a

deciduous In the fields of horticulture and Botany, the term ''deciduous'' () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, ...

leguminous A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...

shrub A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from tree ...

native to

western Western may refer to: Places *Western, Nebraska, a village in the US *Western, New York, a town in the US *Western Creek, Tasmania, a locality in Australia *Western Junction, Tasmania, a locality in Australia *Western world, countries that id ...

and

central Europe Central Europe is an area of Europe between Western Europe and Eastern Europe, based on a common historical, social and cultural identity. The Thirty Years' War (1618–1648) between Catholicism and Protestantism significantly shaped the a ...

. In Britain and Ireland, the standard name is broom; this name is also used for other members of the

Genisteae Genisteae is a tribe of trees, shrubs and herbaceous plants in the subfamily Faboideae of the family Fabaceae. It includes a number of well-known plants including broom, lupine (lupin), gorse and laburnum. The tribe's greatest diversity is in ...

tribe, such as French broom or Spanish broom; and the term ''common broom'' is sometimes used for clarification. In other English-speaking countries, the most common name is "Scotch broom" (or Scots broom); however, it is known as English broom in Australia.

Classification

The two

subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics ( morphology), but that can successfully interbreed. Not all specie ...

of ''Cytisus scoparius'' are: * ''Cytisus scoparius'' subsp. ''scoparius'' - throughout the species' range * ''Cytisus scoparius'' subsp. ''maritimus'' (Rouy) Heywood - Western Europe, on maritime cliffs, differs in prostrate growth, not over 0.4 m tall, and downy young shoots

Cultivation

''Cytisus scoparius'' is widely cultivated as an

ornamental plant Ornamental plants or garden plants are plants that are primarily grown for their beauty but also for qualities such as scent or how they shape physical space. Many flowering plants and garden varieties tend to be specially bred cultivars that ...

, with several

cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture ...

s selected for variation in flower colour, including "Moonlight" with deep yellow flowers, "Andreanus" and "Firefly" with dark orange-red flowers, and growth habit, including "Pendula" with pendulous branchlets.

Description

Cytisus scoparius - Köhler–s Medizinal-Pflanzen-200

Plants of ''C. scoparius'' typically grow to tall, rarely to , with main stems up to thick, rarely . Stems are ridged and green. The shrubs have green shoots with small deciduous trifoliate

leaves A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...

5–15 mm long, and in spring and summer are covered in profuse golden yellow

flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechanis ...

s 20–30 mm from top to bottom and 15–20 mm wide. Flowering occurs after 50–80

growing degree day Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology. GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and animal development rates such as the ...

s. The seed pods have long hairs only along their seams. In late summer, its

legume A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...

s (

seed pods This page provides a glossary of plant morphology. Botanists and other biologists who study plant morphology use a number of different terms to classify and identify plant organs and parts that can be observed using no more than a handheld magnify ...

) mature black, 2–3 cm long, 8 mm broad and 2–3 mm thick; they burst open, often with an audible crack, forcibly throwing seed from the parent plant. This species is adapted to

Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on ...

and coastal climates, and its range is limited by cold winter temperatures. Especially the seeds, seedlings, and young shoots are sensitive to frost; adult plants are hardier, and branches affected by freezing temperatures regenerate quickly. ''C. scoparius'' contains toxic alkaloids that depress the heart and nervous system. As a

, this shrub can fix nitrogen in the soil through a

symbiotic Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or para ...

relationship with ''

Rhizobium ''Rhizobium'' is a genus of Gram-negative soil bacteria that fix nitrogen. ''Rhizobium'' species form an endosymbiotic nitrogen-fixing association with roots of (primarily) legumes and other flowering plants. The bacteria colonize plant cells ...

'' bacteria.

Distribution and habitat

''Cytisus scoparius'' is found in sunny sites, usually on dry, sandy soils at low altitudes, tolerating very acidic soil conditions. In some places outside of its native range, such as India, South America, western North America (particularly Vancouver Island and Washington, Oregon, and California west of the Cascade and Sierra Nevada mountains), Australia, and New Zealand (where it is a declared weed) it has become an ecologically destructive colonizing

invasive species An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species adv ...

grassland A grassland is an area where the vegetation is dominated by grasses ( Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur na ...

, shrub and woodland, and other

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

s. It is common in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It ...

and

Ireland Ireland ( ; ga, Éire ; Ulster-Scots: ) is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the s ...

Invasive species

''Cytisus scoparius'' has been introduced into several other continents outside its native range and is classified as a noxious

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, for ...

and parts of the east coast of

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

, as well as

Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island coun ...

and

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

. These shrubs commonly grow in disturbed areas and along utility and transportation

rights-of-way Right of way is the legal right, established by grant from a landowner or long usage (i.e. by prescription), to pass along a specific route through property belonging to another. A similar ''right of access'' also exists on land held by a gov ...

. The prolific growth of this species after timber harvest inhibits reforestation by competing with seedling trees. It is estimated that it is responsible for US$47 million in lost timber production each year in

. In New Zealand, broom is estimated to cost the forestry industry NZ$90 million, and to cost farmers NZ$10 million.

Biological control Biological control or biocontrol is a method of controlling pests, such as insects, mites, weeds, and plant diseases, using other organisms. It relies on predation, parasitism, herbivory, or other natural mechanisms, but typically also i ...

for broom has been investigated since the mid-1980s with a number of species being tested. They include the broom twig miner ('' Leucoptera spartifoliella''), the broom seed beetle ('' Bruchidius villosus''), the broom gall mite (''

Aceria genistae ''Aceria'' is a genus of mites belonging to the family Eriophyidae, the gall mites. These tiny animals are parasites of plants. Several species can cause blistering and galls, including erineum galls. A few are economically significant pests, wh ...

''), the sap-sucking broom psyllid ('' Arytainilla spartiophila''), the Scotch broom seed weevil ('' Exapion fuscirostre'') and recently the broom leaf beetle ('' Gonioctena olivacea'') and the broom shoot moth ('' Agonopterix assimilella'').

Eradication

The method used to remove broom is dependent on the prolific seed cycle. Care should be taken to avoid disturbing the ground or the seeding plants between late spring and mid fall. From late fall, through winter, to mid spring are preferred times to eradicate mature plants. There are several methods, cutting, pulling, burning, herbicide or introducing chickens and goats. Drought areas respond well to cutting while the

are young and still green. In cooler, wetter areas pulling is the preferred method, and hand-operated broom pullers are available. Low temperature fires, such as a grass fire, will increase seed germination and new sprouts may form on the burned stumps of mature broom. A spring fire followed by drought conditions will reduce seedling survival. Often new plants will grow from roots or seed, requiring repeated treatments.

Phytochemicals

One of main alkaloids of this plant is

cytisine Cytisine, also known as baptitoxine, cytisinicline, or sophorine, is an alkaloid that occurs naturally in several plant genera, such as '' Laburnum'' and ''Cytisus'' of the family Fabaceae. It has been used medically to help with smoking cessa ...

. The characteristic constituents are biogenic amines (mostly

tyramine Tyramine ( ) (also spelled tyramin), also known under several other names, is a naturally occurring trace amine derived from the amino acid tyrosine. Tyramine acts as a catecholamine releasing agent. Notably, it is unable to cross the blood ...

in the young shoots), flavonoids (

spiraeoside Spiraeoside is a chemical compound. It can be isolated from flowers of ''Filipendula ulmaria'' (L.) (a.k.a. ''Spiraea ulmaria'' or ''meadowsweet'') or from the garden onion (''Allium cepa''). Spiraeoside is the 4'-O-glucoside of quercetin Querce ...

and scoparoside),

isoflavone Isoflavones are substituted derivatives of isoflavone, a type of naturally occurring isoflavonoids, many of which act as phytoestrogens in mammals. Isoflavones are produced almost exclusively by the members of the bean family, Fabaceae (Leguminosae) ...

s and their glycosides (

genistin Genistin is an isoflavone found in a number of dietary plants like soy and kudzu. It was first isolated in 1931 from the 90% methanol extract of a soybean meal, when it was found that hydrolysis with hydrochloric acid produced 1 mole each of geni ...

), as well as

allelopathic Allelopathy is a biological phenomenon by which an organism produces one or more biochemicals that influence the germination, growth, survival, and reproduction of other organisms. These biochemicals are known as allelochemicals and can have ben ...

quinolizidine alkaloids Quinolizidine alkaloids are natural products that have a quinolizidine structure; this includes the lupine alkaloids. Occurrence Quinolizidine alkaloids can be found in the plant family of legumes, especially in papilionaceous plants. While t ...

(mostly

sparteine Sparteine is a class 1a antiarrhythmic agent; a sodium channel blocker. It is an alkaloid and can be extracted from scotch broom. It is the predominant alkaloid in '' Lupinus mutabilis'', and is thought to chelate the bivalent cations calcium and ...

, lupanine, scoparin and hydroxy-derivatives), which defend the plant against insect infestation and

herbivory A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet. As a result of their plant diet, herbivorous animals typically have mouthpart ...

(with the exception of the resistant ''

Aphis cytisorum ''Aphis'' is a genus of insects in the family Aphididae containing at least 600 species of aphids. It includes many notorious agricultural pests, such as the soybean aphid '' Aphis glycines''. Many species of ''Aphis'', such as '' A. coreopsidis ...

'').

Medicinal uses

Broom contains scoparin, which is a

diuretic A diuretic () is any substance that promotes diuresis, the increased production of urine. This includes forced diuresis. A diuretic tablet is sometimes colloquially called a water tablet. There are several categories of diuretics. All diuretics i ...

. The plant also is used as a

cathartic In medicine, a cathartic is a substance that ''accelerates'' defecation. This is similar to a laxative, which is a substance that ''eases'' defecation, usually by softening feces. It is possible for a substance to be both a laxative and a catha ...

and as a

cardiac stimulant A cardiac stimulant is a substance which acts as a stimulant of the heart – e.g., via positive chronotropic or inotropic An inotrope is an agent that alters the force or energy of muscular contractions. Negatively inotropic agents weaken the fo ...

, which is credited to the presence of sparteine.''A Modern Herbal'', Grieve, Maude, , p. 127 A decoction or infusion of broom can be used to treat

dropsy Edema, also spelled oedema, and also known as fluid retention, dropsy, hydropsy and swelling, is the build-up of fluid in the body's tissue. Most commonly, the legs or arms are affected. Symptoms may include skin which feels tight, the area ma ...

due to its diuretic action. An ointment can be made from the flowers to treat

gout Gout ( ) is a form of inflammatory arthritis characterized by recurrent attacks of a red, tender, hot and swollen joint, caused by deposition of monosodium urate monohydrate crystals. Pain typically comes on rapidly, reaching maximal intens ...

. Oxysparteine, produced from the action of acid on the sparteine, is useful as a cardiac stimulant and has the advantage over digoxin that it does not accumulate in the body.

Folklore and myth

Welsh mythology Welsh mythology (Welsh: ''Mytholeg Cymru'') consists of both folk traditions developed in Wales, and traditions developed by the Celtic Britons elsewhere before the end of the first millennium. As in most of the predominantly oral societies Celti ...

Blodeuwedd Blodeuwedd (), (Welsh "Flower-Faced", a composite name from ''blodau'' "flowers" + ''gwedd'' "face"), is the wife of Lleu Llaw Gyffes in Welsh mythology. She was made from the flowers of broom, meadowsweet and oak by the magicians Math and Gwy ...

is the name of a woman made from the flowers of broom, meadowsweet (''Filipendula ulmaria'') and the oak by

Math fab Mathonwy In Welsh mythology, Math fab Mathonwy (), also called Math ap Mathonwy (Math, son of Mathonwy) was a king of Gwynedd who needed to rest his feet in the lap of a virgin unless he was at war, or he would die. The story of Math is the fourth of the ...

and

Gwydion Gwydion fab Dôn () is a magician, hero and trickster of Welsh mythology, appearing most prominently in the Fourth Branch of the ''Mabinogi'', which focuses largely on his relationship with his young nephew, Lleu Llaw Gyffes. He also appea ...

to be the wife of

Lleu Llaw Gyffes Lleu Llaw Gyffes (, sometimes spelled Llew Llaw Gyffes) is a hero of Welsh mythology. He appears most prominently in the Fourth Branch of the Mabinogi, the tale of Math fab Mathonwy, which tells the tale of his birth, his marriage, his death, his ...

. Her story is part of the Fourth Branch of the Mabinogi, the tale of '' Math son of Mathonwy''.D.C. Watts Broom was considered a sign of plenty when it bore many flowers.A Modern Herbal'', Grieve, Maude, , p. 126 However a traditional rhyme from

Sussex Sussex (), from the Old English (), is a historic county in South East England that was formerly an independent medieval Anglo-Saxon kingdom. It is bounded to the west by Hampshire, north by Surrey, northeast by Kent, south by the Englis ...

warns: "Sweep the house with blossomed broom in May/sweep the head of the household away." Broom was also used in a decorated bundle of broom at weddings in place of rosemary when that was scarce, and its strong smell was said to be able to tame wild horses and dogs. In Italy, the shrub was burnt to stop witches.

Royal symbols

The name of the

House of Plantagenet The House of Plantagenet () was a royal house which originated from the lands of Anjou in France. The family held the English throne from 1154 (with the accession of Henry II at the end of the Anarchy) to 1485, when Richard III died in b ...

, rulers of England in the Middle Ages, may have been derived from common broom, which was then known as ''planta genista'' in Latin. The plant was used as a

heraldic badge A heraldic badge, emblem, impresa, device, or personal device worn as a badge indicates allegiance to, or the property of, an individual, family or corporate body. Medieval forms are usually called a livery badge, and also a cognizance. They are ...

Geoffrey V of Anjou Geoffrey V (24 August 1113 – 7 September 1151), called the Handsome, the Fair (french: link=no, le Bel) or Plantagenet, was the count of Anjou, Touraine and Maine by inheritance from 1129, and also Duke of Normandy by conquest from 1144. H ...

and five Plantagenet kings of England as a

royal emblem A coat of arms is a heraldic visual design on an escutcheon (i.e., shield), surcoat, or tabard (the latter two being outer garments). The coat of arms on an escutcheon forms the central element of the full heraldic achievement, which in its wh ...

.J. Bernard Burke The ''broomscod'', or seed-pod, was the personal

emblem An emblem is an abstract or representational pictorial image that represents a concept, like a moral truth, or an allegory, or a person, like a king or saint. Emblems vs. symbols Although the words ''emblem'' and '' symbol'' are often use ...

Charles VI of France Charles VI (3 December 136821 October 1422), nicknamed the Beloved (french: le Bien-Aimé) and later the Mad (french: le Fol or ''le Fou''), was King of France from 1380 until his death in 1422. He is known for his mental illness and psychotic ...

References

External links

* *
Bioimages – numerous photos

Garry Oak ecosystems: Invasive speciesSpecies Profile - Scotch Broom(''Cytisus scoparius'')
National Invasive Species Information Center,

United States National Agricultural Library The United States National Agricultural Library (NAL) is one of the world's largest agricultural research libraries, and serves as a national library of the United States and as the library of the United States Department of Agriculture. Located ...

. {{Taxonbar, from=Q145781 scoparius Flora of Europe Flora of Scotland Flora of Ireland Plants described in 1753 Taxa named by Carl Linnaeus