#perennial plants

• Acanthus — The type genus of the Acanthaceae family, comprising around 30 species of perennial herbaceous plants or shrubs native to the temperate and tropical regions of Southern Europe, Africa, and Asia. The plants are recognized by their majestic, deeply lobed, and frequently spiny leaves, and by their erect, dense flower spikes bearing bilabiate flowers. Its name holds immense cultural resonance, as its leaves served as the unchanging historical model for Corinthian and Composite architectural capitals.
• Ajuga genevensis — A species of perennial herbaceous flowering plant in the mint family Lamiaceae, commonly known as Geneva bugle, blue bugleweed, or standing bugle. It features erect, hairy stems, coarsely toothed leaves, and dense spikes of vibrant blue to violet flowers; unlike Ajuga reptans, it does not produce creeping stolons, growing natively in dry meadows, forest edges, and scrublands.
• Anthericum — A genus of perennial herbaceous plants in the family Asparagaceae (subfamily Agavoideae), characterized by linear leaves in a basal rosette and star-shaped white flowers arranged in long racemes or panicles.
• Aquilegia — A genus of herbaceous perennial plants in the family Ranunculaceae, popularly known as 'columbine'; these structural plants are recognized by their spectacular, rarely shaped flowers equipped with long nectar spurs, being widely utilized in decorative horticulture and studied in evolutionary biology.
• Arabis — A genus of herbaceous, annual or perennial plants within the family Brassicaceae (Cruciferae), commonly known as rockcress. Most species are native to temperate zones of the Northern Hemisphere and mountainous regions, characterized by often pubescent leaves and small, white, pink, or purple four-petaled flowers, valued in horticulture for rock gardens and ground cover.
• Armeria — A taxonomic genus of perennial herbaceous plants in the Plumbaginaceae family, comprising numerous species popularly known as 'sea thrift' or 'thrift' (e.g., Armeria maritima); these plants often grow in rocky coastal or mountainous areas, forming dense, compact cushions decorated with globose pink, purple, or white inflorescences, widely used in alpine gardening.
• Aruncus — A genus of herbaceous perennial plants in the family Rosaceae, commonly known in wild and decorative flora by the popular name 'goat's beard'. The plant is characterized by large, compound leaves and spectacular inflorescences in the form of branched panicles, made up of numerous small, white or cream flowers, preferring shady mountain areas, damp forests, and stream banks.
• Asarum — A genus of herbaceous, perennial plants in the Aristolochiaceae family, widespread in the shady deciduous forests of the Northern Hemisphere, characterized by creeping rhizomes with an aromatic odor and cordate or reniform, shiny green leaves. The typical representative in Romania's flora is Asarum europaeum, popularly known as wild ginger or asarabacca, a plant structurally used in traditional medicine due to its emetic and purgative properties.
• Asyneuma — A genus of perennial herbaceous plants in the family Campanulaceae, native to temperate regions of Europe and Asia. These species are characterized by erect stems, elongated spike-like or racemose inflorescences, and corollas deeply divided into five narrow, almost filiform lobes, presenting a distinctive starry appearance.