#leaf

• abscission — (Botany) The natural physiological process of separation and shedding of leaves, flowers, or ripe fruits, due to the formation of a special layer of loosely cemented cells at the base of the petiole.
• Abutilon avicennae — The synonymous scientific designation for *Abutilon theophrasti*, popularly known in Romanian as 'teiușor' or 'crucea-pământului'. This annual herbaceous plant in the Malvaceae family, native to Asia, is recognized in modern agronomy as a severe invasive weed in row crops (corn, sunflower, soy), characterized by large, velvety, heart-shaped leaves and rigid, decorative, star-like seed capsules.
• Abutilon theophrasti — The standard scientific name for velvetleaf, an annual herbaceous plant in the Malvaceae family, native to Southern Asia and widely naturalized across Europe and the Americas. Agronomically, it is considered an extremely harmful and highly competitive weed for agricultural row crops, remarkable for its robust stem covered in velvety hairs, large heart-shaped leaves, and characteristic semicircular capsule fruits made of radially arranged chambers.
• Knife-leaf wattle — A remarkable species of medium-sized evergreen shrub, native to the dry regions of New South Wales and Queensland, Australia. The plant is distinguished by a unique morphological profile, characterized by asymmetric, rigid, triangular phyllodes (modified stems acting as leaves) that resemble a knife blade or hatchet, sporting an elegant glaucous-green or silvery tint. It is highly valued in landscaping due to its drought tolerance and spectacular spring bloom, when its arching branches become completely smothered in dense clusters of intensely fragrant, bright golden-yellow flowers.
• Acalypha — A large genus of herbaceous plants, shrubs, and subshrubs in the Euphorbiaceae family, comprising hundreds of species widely distributed across tropical and subtropical regions of the world. Plants within this genus are highly valued in horticulture as ornamental species due to their unique inflorescences shaped like long, pendulous, and fuzzy catkins or spikes, often intensely colored in bright red or crimson shades, as well as for their exotic, serrated, and variegated foliage.
• Acalypha wilkesiana — A species of tropical evergreen shrub in the Acalypha genus, native to the South Pacific islands (Vanuatu, Fiji), remarkable for its spectacular, multicolored, and asymmetrical foliage. Its large, serrated, and often crinkled leaves exhibit complex chromatic patterns in shades of bronze, copper, red, pink, and cream. In horticulture, it is widely used for hedging in warm climates or as an accent plant in greenhouses and interiors due to its outstanding visual value.
• Acanthus — A sculptural or pictorial decorative element characteristic of classical architectural styles (especially the Corinthian and Composite orders), stylized after the deeply notched and sinuous leaves of the Mediterranean plant Acanthus. Initially used in Greek and Roman Antiquity to adorn the capitals of columns, the acanthus became a universal ornamental motif in art history, being adopted and reinterpreted in Renaissance, Baroque, and Neoclassicism.
• Acrodromous — Regarding leaves or venation patterns; exhibiting acrodromy, where two or more primary or secondary veins originate from the leaf base and run convergently toward the apex, joining at the tip.
• Actinodromous — Relating to leaf venation; characterized by a structure where three or more primary veins diverge radially from a single central point located at the base of the blade (at the petiole insertion) and run toward the margin or apex of the leaf. This structural anatomical pattern is characteristic of many dicotyledonous plant families (such as maple or grapevine leaves), ensuring an even distribution of raw sap across the entire foliar surface.
• Adansonii — A specific epithet used in binary botanical nomenclature to name distinct plant species, most frequently associated with the species Monstera adansonii or the historical subspecies of the African baobab, Adansonia digitata. The term classifies plant varieties remarkable for their structural adaptations, such as the naturally perforated leaves of the popular climbing monstera widely used in contemporary interior design.
• Adaxial — Facing toward the axis, located in the direction of the axis, or oriented toward the upper surface of a plant organ (such as the upper or inner surface of a leaf, situated closest to the plant stem). In botanical morphology, the term describes the structural polarity of organs during their developmental phase, being the opposite of 'abaxial'.
• Adenophora lilifolia — A species of perennial herbaceous plant native to the temperate regions of Eurasia, belonging to the Campanulaceae family. It is structurally recognized for its erect stems, lanceolate leaves with serrated margins, and rich panicle-like inflorescences containing pendulous, bell-shaped (campanulate) flowers of a pale blue or violet color, emitting a subtle fragrance and valued in ecological ornamental horticulture.
• Adiantum macrophyllum — A species of tropical fern in the Pteridaceae family, native to the neotropical regions of Central and South America, as well as the Caribbean islands. This plant is structurally remarkable for its large pinnate fronds with opposite, triangular or ovate leaflets of a leathery texture, which display a spectacular shade of pinkish-salmon or copper when young, gradually turning into a deep green at maturity.
• Adromischus mammillaris — A rare perennial succulent plant species within the genus Adromischus, native to the arid expanses of South Africa, particularly the Little Karoo. The plant features prostrate or decumbent stems and unique, linear-lanceolate yet highly thickened, plump leaves of a light green or olive-green hue, often dotted with dark reddish-purple speckles near the apex. In modern botanical nomenclature, it is taxonomically tied as a synonym to the variable Adromischus filicaulis complex.
• Aeonium — A genus of subtropical succulent plants in the family Crassulaceae, native mainly to the Canary Islands, structurally characterized by fleshy leaves arranged in perfect geometric, flower-like rosettes, often growing at the ends of woody stems. They are highly valued as ornamental plants due to their exceptional drought tolerance.
• Aphylly — The biological state, trait, or evolutionary phenomenon consisting of the complete, congenital, or adaptive absence of leaves in a plant or vegetative organ; it represents a major xerophytic modification optimized to minimize water loss.
• Aphyllopodous — A specialized term used to describe a plant, organ, or vegetative axis whose peduncle, support, or structural base is completely devoid of leaves or foliar appendages. In plant morphology, the aphyllopodous trait represents an evolutionary adaptation to reduce water loss.
• Agave geminiflora — A unique species of succulent plant within the genus Agave, native to the state of Nayarit, Mexico. This plant is structurally characterized by an extremely dense and symmetrical rosette composed of hundreds of narrow, linear, flexible, and rounded leaves, lacking marginal teeth but often featuring decorative white filaments peeling from the edges. Its specific epithet refers to its spectacular flowering spike, where the flowers appear arranged in twin pairs along the stalk.
• Akebia quinata — The type species of a vigorous, woody climbing vine native to the shaded forests of Japan, China, and Korea, belonging to the Lardizabalaceae family; it is internationally recognized by the popular name 'chocolate vine' due to the exotic, sweet, and intense cocoa-scented fragrance emitted by its springtime purple flowers. Structurally, the plant stands out for its palmate-compound foliage consisting of exactly five oval, bluish-green leaflets, and its ability to develop flexible stems that twine rapidly around supports, producing large, elongated pale-violet berries at the end of summer with a sweet, edible gelatinous pulp.
• Akebia trifoliata — A species of deciduous, woody climbing vine closely related to the chocolate vine, native to the mountainous and forested regions of East Asia; it is structurally distinguished by its compound foliage consisting of exactly three large leaflets with slightly wavy or lobed margins, and by the rougher, darker texture of its stems' bark. Its unisexual flowers exhibit a deep dark-purple, almost black hue, and the large berries produced in autumn have an exotic, split-pod appearance, housing black seeds embedded in a sweet gelatinous pulp valued in ornamental horticulture and as a local delicacy.