4,295 articles
Armageddon (pepper)
Armageddon is a super-hot chilli pepper cultivar bred by the British seed company Tozer Seeds, marketed as the first hybrid super-hot and rated at 1.3 million Scoville units.
Armeria
Armeria (thrift, sea pink) is a genus of about 100–260 perennial Plumbaginaceae herbs with basal rosettes and globose flower heads, centered in the Mediterranean; Italy is its second biodiversity hotspot with 10 endemic species per a 2026 revision.
Armillaria ostoyae
Armillaria ostoyae, the honey mushroom or shoestring fungus, is a parasitic forest pathogen; its Oregon "Humongous Fungus" genet covers 2,385 acres in Malheur National Forest and is considered the largest known living organism.
Arnica
Arnica, a Northern Hemisphere genus of about 31 Asteraceae species, is the source of Arnica montana, used externally for bruises and sprains; internal use is toxic and homeopathic efficacy is unproven.
Arnica montana
Arnica montana (mountain arnica, Echte Arnika) is a European Asteraceae perennial whose yellow flower heads yield helenalin sesquiterpene lactones used topically for bruises and sprains; endangered in Germany, CITES-listed, EU traditional-use herbal monograph.
Aronia
Aronia, known as chokeberry or chokeberries, is a genus of deciduous shrubs in the rose family native to eastern North America, grown for its dark, polyphenol-rich fruit used in juice and wine.
Aronia melanocarpa
Aronia melanocarpa (black chokeberry) is a North American Rosaceae shrub grown for astringent, polyphenol- and anthocyanin-rich berries used in juices and functional foods; human RCT meta-analyses show no significant cardiometabolic effects.
Arracacia xanthorrhiza
Arracacia xanthorrhiza (arracacha, Peruvian parsnip) is an Andean Apiaceae herb domesticated about 3000 years ago for its starchy storage root, grown at 600–3600 m in Brazil, Colombia, and other Andean countries, propagated by cormels.
Arrhenatherum
Arrhenatherum (oatgrass, false oat-grasses) is a genus of seven accepted perennial grasses in Poaceae, Aveninae, native from Macaronesia and Europe to Central and West Asia and NW Africa; its best-known species is A. elatius, tall oatgrass.
Arrhenatherum elatius
Arrhenatherum elatius, false oat-grass or tall oatgrass (Avena elatior), a perennial Poaceae grass native from Europe to Iran, grown for hay and pasture; the bulbous subspecies bulbosum is the arable weed onion couch.
Arrowroot
Maranta arundinacea (arrowroot, araruta, garut) is a perennial Marantaceae herb native from Mexico to tropical America, grown for easily digestible starch from its rhizomes, commercially centered on St Vincent.
Artemisia
Artemisia, known as wormwood, mugwort, and sagebrush, is a genus of about 540 aromatic herbs and shrubs in the daisy family, source of the antimalarial drug artemisinin.
Artemisia absinthium
Artemisia absinthium (wormwood, absinthium), Asteraceae perennial of Europe to Siberia, W. Himalaya, N. Africa; source of absinthe's thujone, EMA traditional use for appetite loss and dyspepsia, invasive in North America.
Artemisia annua
Artemisia annua (qinghao), annual Asteraceae herb native from North Africa to Eurasia; sole natural source of the antimalarial sesquiterpene artemisinin, made in glandular trichomes and the basis of ACT drugs.
Artemisia tridentata
Artemisia tridentata, big sagebrush, is an aromatic evergreen Asteraceae shrub dominating 62 million hectares of western North America, with basin, mountain, and Wyoming subspecies on distinct soils and elevations, killed by fire and regenerating only from seed.
Artemisia vulgaris
Artemisia vulgaris, common mugwort (ai-yeh, moxa), a perennial Asteraceae herb native to temperate Eurasia and North Africa, naturalized in North America; medicinal and culinary herb with thujone limits, allergy risk, and invasive status in the northeastern US.
Artichoke
Globe artichoke (Cynara cardunculus var. scolymus), also called French or green artichoke, is a Mediterranean thistle grown for its edible immature flower buds; domesticated in Roman times, it needs 250-500 chill hours and centers on Monterey County, California production.
Artocarpus
Artocarpus (breadfruit genus) is a Moraceae tree genus of about 70 species from tropical Asia to the western Pacific, with Borneo as its ancestral range; it yields jackfruit, breadfruit, cempedak, and marang, with compound syncarp fruits up to 45 kg.
Artocarpus integer
Artocarpus integer, cempedak (champada, chempedak), a Moraceae fruit tree native from Peninsula Thailand to Malesia, related to jackfruit and breadfruit; aromatic 0.6–3.5 kg fruits, teak-strength timber, IUCN Least Concern.
Arum
Arum L. (arum lilies, lords-and-ladies) is a genus of 28 tuberous Araceae herbs native from Macaronesia and Europe to W. China, with heat- and odor-producing lure-and-trap inflorescences pollinated mainly by Psychoda flies, toxic calcium oxalate raphides, and Mediterranean origin.
Arum maculatum
Arum maculatum, known as cuckoo pint, lords-and-ladies, or wild arum, is a tuberous woodland plant of the arum family, native to Europe, with hooded flowers and toxic scarlet berries.
Aruncus
Aruncus (goat's beard) is a genus of five accepted dioecious perennial species in Rosaceae, native to the temperate Northern Hemisphere; A. dioicus grows 3-6 ft with creamy plumes, A. aethusifolius is a 12-inch Korean dwarf.
Arundinaria
Arundinaria (river cane, switch cane) is a genus of four temperate bamboo species in Poaceae, the only New World genus of tribe Arundinarieae, native to central and eastern USA, formerly canebrake-forming and now under restoration.
Arundo
Arundo (giant reeds), Poaceae genus with five accepted species including Arundo donax, giant reed; Mediterranean-to-East Asian rhizomatous reeds used for bioenergy and reed instruments, and highly invasive elsewhere.
Asarum
Asarum (wild ginger) is a genus of about 138 accepted species of aromatic rhizomatous herbs in Aristolochiaceae, native to the temperate Northern Hemisphere, most diverse in East Asia, used as the Chinese medicine Xixin but containing nephrotoxic aristolochic acid analogs.
Asarum europaeum
Asarum europaeum (asarabacca, European wild ginger), Aristolochiaceae perennial native from Europe to Central Siberia; evergreen ground cover with hidden flowers; contains toxic, carcinogenic aristolochic acid.
Asclepias
Asclepias, commonly known as milkweeds, is a genus of about 130 plants in the dogbane family. These herbaceous perennials are a major host plant for monarch butterflies.
Asclepias curassavica
Asclepias curassica, or tropical weed, is a flowering plant native to Mexico. It is grown as an ornamental and serves as a host for the monarch butterfly.
Asclepias syriaca
Asclepias syriaca, common milkweed (silkweed, Virginia silkweed), a rhizomatous perennial Apocynaceae herb native to central-eastern North America, monarch larval host, cardenolide-defended, a cropland weed and invasive in Europe.
Asclepias tuberosa
Asclepias tuberosa (butterfly weed, pleurisy root) is a tuberous-rooted North American milkweed with clear sap and orange flowers, a monarch larval host, and a former official medicinal root.