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| Senna | |
|---|---|
| Name | Senna |
| Regnum | Plantae |
| Unranked divisio | Angiosperms |
| Unranked classis | Eudicots |
| Unranked ordo | Rosids |
| Ordo | Fabales |
| Familia | Fabaceae |
| Subfamilia | Caesalpinioideae |
| Tribus | Cassieae |
| Genus | Cassia |
Senna Senna is a genus of flowering plants in the Fabaceae family comprising dozens to hundreds of species of shrubs, trees, and herbs. Widely recognized in botanical, medicinal, and horticultural contexts, these taxa have been treated in floras from Europe to Africa, Asia, Australia, and the Americas. Species are notable for their pinnate leaves, pea-like flowers, and leguminous pods, and they intersect with subjects such as botany, pharmacology, horticulture, and ethnobotany.
The genus has been circumscribed and revised by authorities including Carl Linnaeus, George Bentham, and modern systematists working in institutions like the Royal Botanic Gardens, Kew, the Missouri Botanical Garden, and the Australian National Herbarium. Molecular phylogenetic studies published in journals such as Taxon and Systematic Botany have reshaped relationships among former members of Cassia, Chamaecrista, and other genera. Major species complexes include taxa historically treated as Senna alexandrina (syn. Cassia angustifolia), Senna obtusifolia, Senna occidentalis, and Senna artemisioides, with regional floras in Australia and Africa documenting endemics. Conservation assessments are undertaken by organizations such as the International Union for Conservation of Nature and national agencies like the United States Department of Agriculture plant databases.
Plants exhibit pinnate leaves with multiple leaflets, often with extrafloral nectaries; flowers are zygomorphic or slightly bilateral with five petals and ten stamens of variable fertility, as discussed in texts by A. B. Rendle and illustrated in floras from Flora of Australia and Flora Europaea. Fruits are dehiscent pods containing multiple seeds, with morphology used by taxonomists in keys found in monographs from the Royal Botanic Gardens, Kew and the Botanical Research Institute of Texas. Morphological variation includes herbaceous annuals like those treated in regional manuals from Brazil to woody shrubs described in the Flora of China. Leaf, flower, and pod traits are commonly compared with those of related genera in the subfamily, such as Chamaecrista.
Species occur pantropically and in temperate zones, with concentrations of diversity in Australia, Africa, South America, and South Asia. Habitats range from dry scrub and savanna ecosystems described in studies from Serengeti National Park to riparian zones noted in reports on Amazon Rainforest flora. Several species have become naturalized and invasive in regions including parts of North America and Southeast Asia, where they appear in invasive species lists maintained by agencies such as the IUCN and national parks administrations. Elevational ranges span lowland coastal areas to montane slopes recorded in floristic surveys of the Himalayas and Andes.
Flowers are visited by diverse pollinators including bees documented in faunal surveys by the Smithsonian Institution, butterflies recorded in field guides from the National Geographic Society, and nectarivorous birds noted in ornithological literature such as works published by the Cornell Lab of Ornithology. Some species employ specialized buzz-pollination mechanisms studied in ecological journals like Ecology Letters, while extrafloral nectaries mediate interactions with ants described in articles in Oikos and Ecology. Seed dispersal is often by dehiscent pod opening and secondary dispersal by mammals and birds featured in mammalogy and avifauna accounts from institutions such as the American Museum of Natural History.
Certain species are important in traditional medicine systems practiced in regions influenced by Ayurveda, Unani medicine, and Traditional Chinese Medicine, and they appear in pharmacopeias compiled by organizations like the World Health Organization. Fibers, dyes, and fodder uses are noted in ethnobotanical surveys from West Africa and South America, while ornamental selections are cultivated in botanical gardens such as the Kew Gardens and municipal collections in Sydney and Los Angeles. Cultural references occur in literature and herbals from periods including the Medieval and Colonial eras documented in archives held by national libraries like the British Library and the Library of Congress.
Leaves, pods, and seeds contain anthraquinones, sennosides, flavonoids, and other glycosides investigated in journals including Journal of Ethnopharmacology and Phytochemistry. Active compounds such as sennosides have laxative properties evaluated in clinical trials reported in The Lancet and systematic reviews indexed by databases like PubMed. Toxicity, dosage, metabolic pathways, and drug interactions are subjects of research in pharmacology departments at universities including Harvard Medical School and Johns Hopkins University, and regulatory assessments have been made by agencies like the European Medicines Agency and the U.S. Food and Drug Administration.
Propagation methods—seed, cuttings, and tissue culture—are described in horticultural manuals from institutions such as the Royal Horticultural Society and university extension services like those of University of California, Davis. Soil, light, and pruning recommendations appear in greenhouse guides used by botanical collections at the Royal Botanic Garden Edinburgh and arboreta like the Arnold Arboretum. Pest and disease management references cite studies from agricultural research centers including the International Crops Research Institute for the Semi-Arid Tropics and national plant protection organizations.