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| Larrea divaricata | |
|---|---|
| Name | Larrea divaricata |
| Regnum | Plantae |
| Divisio | Magnoliophyta |
| Classis | Magnoliopsida |
| Ordo | Zygophyllales |
| Familia | Zygophyllaceae |
| Genus | Larrea |
| Species | L. divaricata |
| Binomial | Larrea divaricata |
| Binomial authority | Cav. |
Larrea divaricata is a species of flowering shrub in the family Zygophyllaceae native to South America, known for its evergreen, resinous foliage and cultural importance among Andean and Patagonian peoples. The species has been studied in contexts ranging from regional ethnobotany to phytochemistry and desert ecology, and appears in botanical collections and herbarium records across institutions in Argentina, Bolivia, and Chile. It is related to other members of the genus that have attracted attention for traditional medicine and ecological roles in arid landscapes.
Larrea divaricata was described by Antonio José Cavanilles and placed in the genus Larrea, which is part of the family Zygophyllaceae. Taxonomic treatments have compared L. divaricata with congeners such as the North American Larrea tridentata and other South American taxa examined by botanists associated with institutions like the Royal Botanic Gardens, Kew, the Missouri Botanical Garden, and the Real Jardín Botánico de Madrid. Nomenclatural history involves synonyms and regional usages recorded in floras produced by authorities including the Flora of Argentina projects and specialists at the National University of Córdoba. Type specimens are conserved in European and South American herbaria that collaborate with collections like the European Nucleotide Archive and the Global Biodiversity Information Facility.
Larrea divaricata is a woody, evergreen shrub typically reaching heights recorded in floristic surveys by the Instituto Nacional de Tecnología Agropecuaria and described in monographs by researchers at the University of Buenos Aires. Leaves are opposite, pinnately compound descriptions echoing plates in publications from the Smithsonian Institution herbarium. Flowers are yellow, five-petaled, borne singly or in small clusters; morphological comparisons appear in keys produced by the Royal Botanic Garden Edinburgh. The plant produces dry schizocarpic fruits documented in field guides used by the Argentine Museum of Natural Sciences and morphological studies cited in theses from the National University of La Plata. Diagnostic features have been used by ecologists at the Comahue University for shrubland mapping.
Larrea divaricata occurs across arid and semi-arid regions of South America, with populations recorded in Argentina, Bolivia, Chile, and adjacent Patagonian steppe zones cataloged by the Instituto Geográfico Nacional. Floristic surveys conducted by researchers from the Pontifical Catholic University of Chile and the University of Mendoza report occurrences in montane scrub, lowland saline flats, and thorny steppe habitats. The species is commonly associated with plant communities described in regional conservation assessments by the National Parks Administration (Argentina) and in vegetation maps produced by the Food and Agriculture Organization regional offices. Elevational ranges and soil preferences are reported in studies affiliated with the Universidad Nacional del Comahue and the Andean Research Institute.
Ecological research has examined L. divaricata as a nurse shrub and as part of shrub-steppe dynamics surveyed by ecologists at the CONICET and the Max Planck Institute for Chemical Ecology. It provides structural habitat for arthropods documented in entomological collections at the Natural History Museum, London and supports bird species recorded in avifaunal inventories by the BirdLife International partner groups. Mycorrhizal associations and root microbiome studies have been referenced in collaborative projects involving the University of Córdoba and the International Center for Tropical Agriculture. Interactions with grazing mammals and livestock are discussed in agricultural extension literature from the Institute of Agricultural Technology and in grazing management plans developed by provincial governments.
Local communities, including indigenous groups described in ethnographic work by the National Indigenous Institute (Argentina), have used L. divaricata in traditional remedies and artisanal practices recorded by anthropologists at the University of Salta and the Latin American Society of Ethnobiology. Preparations include decoctions and topical applications for ailments noted in compilations by the World Health Organization regional office and in pharmacopeias assembled by researchers at the University of La Plata. The species features in local names and cultural narratives documented in monographs from the Museum of Natural History of San Juan and in regional botanical guides published by the Provincial Government of San Juan.
Phytochemical analyses conducted in laboratories at the National Scientific and Technical Research Council (CONICET) and the University of Buenos Aires report lignans, flavonoids, and phenolic compounds, with biochemical profiling techniques developed in collaboration with the Max Planck Institute and mass spectrometry facilities at the Institute of Chemistry (UBA). Comparative studies reference compounds characterized in Larrea tridentata research carried out by teams at the University of Arizona and the Southwest Center for Environmental Research and Policy. Pharmacological assays cited in dissertations from the National University of Córdoba have evaluated antioxidant and antimicrobial activities, with bioassays coordinated with laboratories at the National Institute of Industrial Technology.
Conservation status assessments involve national red lists and management plans produced by the Argentine Secretariat of Environment and Sustainable Development and the Chilean Forest Service (CONAF). Threats include habitat conversion and grazing pressures documented in environmental impact reports prepared for provincial ministries and by researchers at the National University of Comahue. Ex situ conservation is pursued via seed banks and living collections at botanical institutions including the Botanical Garden of Buenos Aires and collaborative programs with the Millennium Seed Bank Partnership. Conservation research is ongoing through projects funded by agencies such as the National Agency for Scientific and Technological Promotion (ANPCyT) and international conservation partners.
Category:Zygophyllaceae Category:Flora of Argentina Category:Flora of Bolivia Category:Flora of Chile