#weed

• Alternanthera — A major genus of herbaceous plants or shrubs in the family Amaranthaceae, primarily native to tropical and subtropical regions of the Americas; it comprises numerous terrestrial and aquatic species, highly valued in horticulture and aquascaping for their spectacular, vividly colored decorative foliage in shades of red, purple, pink, or yellow.
• Alternanthera amoena — A popular species of dwarf ornamental plant within the genus Alternanthera, native to Brazil; it is widely used in ornamental carpet bedding and mosaic gardening for low vegetation mats due to its small, lanceolate, multicolored leaves (blotched with intense shades of green, copper, carmine, red, and yellow).
• Alternanthera bettzickiana — A species of perennial herbaceous plant in the family Amaranthaceae, native to South America; it is widely used in global ornamental horticulture due to its dense foliage, variegated or blotched in spectacular shades of red, purple, yellow, and cream, making it ideal for low borders and landscape mosaics.
• Alternanthera versicolor — A species or horticultural variety of ornamental plant within the genus Alternanthera, remarkable for its intensely colored leaves that change shades depending on light exposure and age, displaying a spectacular mix of green, pink, carmine, copper, and blood-red.
• Amaranthus — The official botanical Latin taxonomic designation for a cosmopolitan genus of annual or perennial herbaceous plants in the Amaranthaceae family, commonly known as pigweed or amaranth. The genus comprises over 70 species recognized for their dense inflorescences, high nutritional value, and agricultural adaptability.
• Ambrosia — In Greek mythology, the food of the Olympian gods, believed to confer immortality and eternal youth, possessing an absolute fineness of fragrance and taste. In a modern botanical sense, the term designates an invasive herbaceous plant, native to North America and scientifically known as Ambrosia artemisiifolia, whose pollen is highly allergenic and causes severe respiratory conditions during its flowering season.
• Ampelopsis brevipedunculata — The historical or synonymous scientific name of the species 'Ampelopsis glandulosa' (specifically the brevipedunculata variety), a deciduous woody climbing vine in the grape family (Vitaceae), native to East Asia and popularly known as porcelain berry. It is widely cultivated for its spectacular, multicolored berries that transition from green and yellow to vivid shades of blue, turquoise, and purple, though it exhibits highly invasive tendencies outside its native range.
• Anacharis — A historical genus or scientific synonymous designation for Elodea, a group of perennial, submerged aquatic plants native to North America but widely naturalized worldwide; it is popularly known as waterweed. Due to its accelerated structural growth rate and high oxygenation capacity, it is frequently cultivated in aquariums, although in the natural environment it can become an aggressive invasive weed.
• Waterweed — A rare or archaic popular name attributed to certain submerged aquatic plants from spontaneous or aquarium flora, sometimes used regionally to designate species of the genus Anacharis (Elodea). It represents a simplified phonetic adaptation in local dialect, describing aquatic vegetation with flexible stems and dense leaves, which plays an essential ecological role in oxygenating static or slow-flowing freshwater bodies.
• Anagallis arvensis — The scientific name of the scarlet pimpernel (currently classified as Lysimachia arvensis), an annual herbaceous plant in the family Primulaceae, widespread as a weed in crops, stubble fields, roadsides, and ruderal places. The plant is structurally characterized by four-angled prostrate stems, ovate sessile leaves, and small, solitary flowers of a bright scarlet-red (or blue, in the case of the foemina form), which possess the unique property of closing during cloudy weather or high humidity, acting as a natural barometer.
• Aneto herb — A rare, neologistic name or regional variant occasionally used in the botanical and gastronomic lexicon to denote dill (Anethum graveolens) or a related variety of aromatic plants from the Apiaceae family. In an international culinary context, the term is structurally borrowed from Western Romance languages to describe the leaves and seeds used as a condiment due to their essential oils with strong carminative and aromatic properties.
• Anthemis arvensis — The scientific name for the field chamomile or corn chamomile, an annual herbaceous weed commonly found in cereal crops and meadows, characterized by finely divided leaves and scentless flower heads.
• Anthemis austriaca — The scientific name for Austrian chamomile, a herbaceous species in the family Asteraceae native to Central and Eastern Europe, typically found in ruderal habitats, dry roadsides, and arable land.
• Anthropochorous plant — The feminine form of 'antropocor'; describes a plant species or vegetable population whose seeds, fruits, or spores are dispersed through human activities. As a noun, it denotes the plant that utilizes the human vector, commercial routes, or agricultural tools to migrate and colonize new ecological territories.
• Areci — A rare regional name or popular variant utilized in certain local zones to designate a type of briar, thorny shrub, or harsh weed that grows on arid and uncultivated lands. Its structural meaning stems from empirical pastoral vocabulary, with the term being preserved exclusively in local dialectal glossaries.
• Arenaria serpyllifolia — A species of annual or biennial herbaceous plant in the genus Arenaria, family Caryophyllaceae, widely distributed across Eurasia and North Africa, commonly known as thyme-leaved sandwort. The plant features thin, erect or ascending stems, ovate, sessile leaves rough to the touch, and small, discrete flowers with white petals shorter than the sepals, structurally adapted to dry, sandy, ruderal, or calcareous soils.
• Mexican prickly poppy — A species of pricklepoppy in the family Papaveraceae, native to Mexico and currently widespread across tropical and subtropical regions of the world, commonly known as Mexican prickly poppy. In a structural-botanical sense, this annual plant is adapted to degraded and dry soils, featuring rigid leaves with whitish veins and deeply jagged margins ending in sharp spines, large bright-yellow flowers, and prickly capsules filled with small black seeds; its yellow latex contains toxic alkaloids historically used in traditional medicine and pharmacological research.
• Silverweed — 1. A popular affectionate name given to certain herbaceous plants whose leaves feature fine, silky, silvery-white hairs (such as certain Potentilla species). 2. A feminine diminutive adjective describing a small object that possesses a discreet, fine, metallic shimmer resembling pure silver.
• Regional plant variety — A popular and regional name attributed to certain plant species of the genus Erigeron or Sonchus, used in traditional empirical medicine or recognized as crop weeds in specific regions. In an archaic phytopathological sense, the term can also describe the destructive effect of scorching or premature drying of leaves caused by solar heat or parasitic fungal attacks.
• Field weeds — A rare plural form of the noun 'arvă' (meaning grass or crop plant), often used as a Romanian adaptation for plants of the Arvella family or common field weeds. In an agricultural ecological sense, the term describes spontaneous segetal vegetation that structurally competes with main cereal crops in lowland areas.