''Grindelia squarrosa'', also known as a curly-top gumweed or curlycup gumweed, is a small North American

biennial Biennial means (an event) lasting for two years or occurring every two years. The related term biennium is used in reference to a period of two years. In particular, it can refer to: * Biennial plant, a plant which blooms in its second year and th ...

or short-lived

perennial plant A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

Description

''G. squarrosa'' is a

decumbent This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...

to erect, much-branched

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

herb or

subshrub A subshrub (Latin ''suffrutex'') or dwarf shrub is a short shrub, and is a woody plant. Prostrate shrub is a related term. "Subshrub" is often used interchangeably with "bush".Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Der ...

growing up to tall. The

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

are long, gray-green,

crenate 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, ste ...

with each tooth having a yellow bump near its tip, and resinous.Jepson Manual, University of California (TJM2)
/ref> The plant produces numerous flower heads in open, branching arrays. Each head usually contains 12–40 yellow ray flowers, though sometimes the rays are absent. These surround many small disc flowers. The plant blooms from July through late September. The brown seed is usually four-angled, with loose scales. Grindelia squarrosa discoid flower

Varieties

*''Grindelia squarrosa'' var. ''quasiperennis'' *''Grindelia squarrosa'' var. ''serrulata'' *''Grindelia squarrosa'' var. ''squarrosa''

Distribution and habitat

The species is native to western and central North America, from

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, ...

east to

Québec Quebec ( ; )According to the Government of Canada, Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is ...

and

New England New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York to the west and by the Canadian provinces ...

, and south as far as

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, New Mexico,

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

Chihuahua Chihuahua may refer to: Places *Chihuahua (state), a Mexican state **Chihuahua (dog), a breed of dog named after the state **Chihuahua cheese, a type of cheese originating in the state **Chihuahua City, the capital city of the state **Chihuahua Mun ...

, and

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

. The species may possibly be naturalized in much of the eastern part of that distribution. It is often found in dry, open areas and

disturbed Disturbed may refer to: Books * ''Disturbed'', a 2011 novel by Kevin O'Brien (author) Film and TV * ''Disturbed'' (film), a 1990 film starring Malcolm McDowell * "Disturbed" (''Numb3rs''), a 2009 episode of ''Numb3rs'' * "The Disturbed", a 2 ...

roadsides and streamsides, occurring between and in elevation.

Ecology

The species is listed by the

Lady Bird Johnson Wildflower Center The Lady Bird Johnson Wildflower Center at The University of Texas at Austin is the state botanical garden and arboretum of Texas. The center features more than 900 species of native Texas plants in both garden and natural settings and is hom ...

Native Plant Information Network as of "Special Value to Native Bees."

Toxicity

The plant concentrates

selenium Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, ...

from the soil, and can be toxic when ingested by cattle, humans, and other mammals.

Uses

The flowers and leaves are used by

Great Plains Tribes Plains Indians or Indigenous peoples of the Great Plains and Canadian Prairies are the Native American tribes and First Nation band governments who have historically lived on the Interior Plains (the Great Plains and Canadian Prairies) of ...

as a

medicinal herb Medicinal plants, also called medicinal herbs, have been discovered and used in traditional medicine practices since prehistoric times. Plants synthesize hundreds of chemical compounds for various functions, including defense and protection ag ...

to treat illnesses such as

asthma Asthma is a long-term inflammatory disease of the airways of the lungs. It is characterized by variable and recurring symptoms, reversible airflow obstruction, and easily triggered bronchospasms. Symptoms include episodes of wheezing, cou ...

bronchitis Bronchitis is inflammation of the bronchi (large and medium-sized airways) in the lungs that causes coughing. Bronchitis usually begins as an infection in the nose, ears, throat, or sinuses. The infection then makes its way down to the bronchi. ...

skin rash A rash is a change of the human skin which affects its color, appearance, or texture. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cr ...

es.University of Michigan at Dearborn, Native American Ethnobotany Database: ''Grindelia squarrosa''
/ref> The powdered flowers were also once smoked in cigarettes to ease asthmatic symptoms. It is used as a traditional medicinal plant by

Shoshone The Shoshone or Shoshoni ( or ) are a Native American tribe with four large cultural/linguistic divisions: * Eastern Shoshone: Wyoming * Northern Shoshone: southern Idaho * Western Shoshone: Nevada, northern Utah * Goshute: western Utah, easter ...

peoples in various regions. The Gosiute language name for the plant is ''mu’-ha-kûm''. The

Lakota language Lakota ( ), also referred to as Lakhota, Teton or Teton Sioux, is a Siouan language spoken by the Lakota people of the Sioux tribes. Lakota is mutually intelligible with the two dialects of the Dakota language, especially Western Dakota, and i ...

name for the plant is ''pteíčhiyuȟa.''

Hispanos of New Mexico The Hispanos of New Mexico, also known as Neomexicanos ( es, Neomexicano) or Nuevomexicanos, are Hispanic residents originating in the historical region of Santa Fe de Nuevo México, today the US state of New Mexico (''Nuevo México''), south ...

boiled the buds to make a drink to treat

kidney The kidneys are two reddish-brown bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about in length. They receive blood from the paired renal arteries; blood ...

disorders. Extracts have been made to treat skin irritations, asthma, and

rheumatism Rheumatism or rheumatic disorders are conditions causing chronic, often intermittent pain affecting the joints or connective tissue. Rheumatism does not designate any specific disorder, but covers at least 200 different conditions, including art ...

. The resin has been used to treat poison ivy rashes topically. The plant is being explored as a potential source of

biofuel Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels, such as oil. According to the United States Energy Information Administration (E ...

due to its high content of mono- and di-

terpene Terpenes () are a class of natural products consisting of compounds with the formula (C5H8)n for n > 1. Comprising more than 30,000 compounds, these unsaturated hydrocarbons are produced predominantly by plants, particularly conifers. Terpenes ar ...

s which can be converted to a fuel analogous to

kerosene Kerosene, paraffin, or lamp oil is a combustible hydrocarbon liquid which is derived from petroleum. It is widely used as a fuel in aviation as well as households. Its name derives from el, κηρός (''keros'') meaning "wax", and was regi ...

jet fuel Jet fuel or aviation turbine fuel (ATF, also abbreviated avtur) is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines. It is colorless to straw-colored in appearance. The most commonly used fuels for commercial a ...

. The plant's adaptation to arid climates makes it an attractive option as its cultivation in desert areas would not compete with traditional food crops.

References

External links

* *
Calflora Database: ''Grindelia squarrosa'' (Curlycup gumweed)
* {{Taxonbar, from=Q312228 squarrosa Flora of Canada Flora of Northeastern Mexico Flora of Northwestern Mexico Flora of the Eastern United States Flora of the Western United States Flora of the Great Plains (North America) Flora of California Flora of the Great Basin Flora of the Sierra Nevada (United States) Plants described in 1813 Plants used in traditional Native American medicine Flora without expected TNC conservation status