__NOTOC__ Yareta or llareta (''Azorella compacta'', known historically as ''Azorella yareta'', from ''yarita'' in the

Quechua language Quechua (, ; ), usually called ("people's language") in Quechuan languages, is an Indigenous languages of the Americas, indigenous language family spoken by the Quechua peoples, primarily living in the Peruvian Andes. Derived from a common anc ...

) is a velvety, chartreuse

cushion plant A cushion plant is a compact, low-growing, mat-forming plant that is found in alpine, subalpine, arctic, or subarctic environments around the world. The term "cushion" is usually applied to woody plants that grow as spreading mats, are limited in ...

in the family

Apiaceae Apiaceae or Umbelliferae is a family of mostly aromatic flowering plants named after the type genus ''Apium'' and commonly known as the celery, carrot or parsley family, or simply as umbellifers. It is the 16th-largest family of flowering plants ...

which is native to

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

. It grows in the

Puna grassland The puna grassland ecoregion, of the montane grasslands and shrublands biome, is found in the central Andes Mountains of South America. It is considered one of the eight Natural Regions in Peru,Pulgar Vidal, Javier: Geografía del Perú; Las Ocho ...

s of the

Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...

, northern

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

and western

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

at altitudes between . YaretaSurface

Description

Yareta is an

evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, which ...

perennial with a low, mat-like shape and hemispherical growth form that grows to around 6 m (~20 ft) in diameter. The

self-fertile Self-incompatibility (SI) is a general name for several genetic mechanisms that prevent self-fertilization in sexually reproducing organisms, and thus encourage outcrossing and allogamy. It is contrasted with separation of sexes among individuals ...

, pink or lavender flowers are

hermaphroditic In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separ ...

and are pollinated by

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pairs ...

s. The plant prefers sandy, well-drained soils. It can grow in nutritionally poor soils that are acidic, neutral or basic (alkaline) at altitudes of up to . Yareta is well-adapted to high

insolation Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m ...

rates typical of the Andes highlands and cannot grow in shade. The plant's leaves grow into an extremely compact, dense mat that reduces heat and water loss. This mat grows near the ground where air temperature is one or two degrees Celsius higher than the mean air temperature. This temperature difference is a result of the longwave radiation re-radiated by the soil surface, which is usually dark gray to black in the Puna. Yareta is estimated to grow approximately per year. Many yaretas are estimated to be over 3,000 years old. These oldest ones have been reported to grow as slowly as 1/18th inch (1.4 millimeters) per year. Its very slow growth makes the traditional practice of harvesting it for fuel highly unsustainable.

Gallery

File:Yareta 2.jpg, Plant in crevice in

Eduardo Avaroa Andean Fauna National Reserve The Eduardo Avaroa Andean Fauna National Reserve (''Reserva Nacional de Fauna Andina Eduardo Avaroa''; Spanish acronym: REA) is located in Sur Lípez Province. Situated in the far southwestern region of Bolivia, it is the country's most visite ...

, Potosí, Bolivia File:Azorella compacta (8427860829).jpg, Close-up showing seeds File:Azorella compacta (yareta) en la Isla H, Ushuaia, Argentina.JPG, Texture of surface File:Yareta DSCN6066mod.jpg, Flowers

References

External links

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''Azorella compacta'' pictures from Chile
{{Taxonbar, from=Q551995 Azorella Flora of the Andes Flora of Argentina Flora of Bolivia Flora of northern Chile Flora of Peru