4,295 articles
Amaranthus hybridus
Amaranthus hybridus (smooth pigweed, bledo) is a monoecious annual Amaranthaceae weed native from southern Ontario to western South America, wild ancestor of the three grain amaranths, used as a leafy vegetable, and a herbicide-resistant crop weed.
Amaranthus palmeri
Amaranthus palmeri (Palmer amaranth, carelessweed), a dioecious Sonoran Desert-native annual weed, now in over 45 countries, resistant to nine herbicide sites of action and among the most damaging weeds of cotton, maize, and soybean.
Amaranthus retroflexus
Amaranthus retroflexus (redroot pigweed, rough pigweed), an annual Amaranthaceae weed native to North America (Kew: Mexico), naturalized worldwide; up to 300,000 seeds per plant, herbicide-resistant, nitrate-toxic to livestock, young leaves edible.
Amaranthus spinosus
Amaranthus spinosus, spiny amaranth or spiny pigweed (Chinese 刺苋, ci xian), is a spine-bearing annual amaranth native from Mexico to Tropical America, now a widespread tropical weed with US resistance to WSSA herbicide groups 2 and 9, used as a leafy vegetable and folk medicine.
Amaranthus tricolor
Amaranthus tricolor (Chinese spinach, Joseph's coat, callaloo) is a tropical Asian annual Amaranthaceae herb grown as a leafy vegetable and ornamental; a C4, heat- and drought-tolerant crop rich in protein, iron, calcium, and carotenoids.
Amaranthus viridis
Amaranthus viridis, slender or green amaranth (bledo), an annual Amaranthaceae herb native from SE Mexico to tropical America, now a cosmopolitan weed and leafy vegetable used as food, animal feed, and medicine.
Amaryllidaceae
Amaryllidaceae, the amaryllis family (J.St.-Hil., 1805), a monocot family in Asparagales with subfamilies Amaryllidoideae, Allioideae, and Agapanthoideae; bulbous herbs including Narcissus, Galanthus, and Allium, source of galanthamine.
Amaryllis
Amaryllis is a small genus of South African bulbous plants, best known for Amaryllis belladonna, the Jersey lily, which bears fragrant pink or white trumpet flowers on leafless stems in late summer.
Amaryllis belladonna
Amaryllis belladonna, the belladonna lily, naked lady, or Jersey lily, is a South African Cape bulb, the true Amaryllis, flowering on leafless solid stems in autumn; often confused with Hippeastrum, the holiday 'amaryllis'.
Amauropelta
Amauropelta Kunze, marsh fern genus of Thelypteridaceae with about 215 species, mostly Neotropical; formerly a subgenus of Thelypteris, restored to genus rank after 2015 molecular phylogenetic work.
Amauropelta noveboracensis
Amauropelta noveboracensis, New York fern (thélyptère de New York), a deciduous Thelypteridaceae fern of eastern North America and the Russian Far East; fronds taper at both ends, 2n=54, moved from Thelypteris to Amauropelta in 2021.
Ambrosia artemisiifolia
Ambrosia artemisiifolia (common or short ragweed) is a North American annual Asteraceae herb, invasive in Europe and Asia, whose highly allergenic pollen, led by the major allergen Amb a 1, causes hay fever and asthma in millions.
Ambuchanania
Ambuchanania, with its single species Ambuchanania leucobryoides (daisy pan moss), is a monotypic Tasmanian moss genus in the Sphagnopsida, sister to Eosphagnum, endemic to southwest Tasmania's quartzite sandy washes and listed as rare.
Amburana cearensis
Amburana cearensis (cumaru, imburana-de-cheiro, cerejeira; syn. Torresea cearensis) is an endangered Fabaceae timber tree of South American seasonally dry forests, used in folk medicine for respiratory ailments; its coumarins, amburoside A/B, and flavonoids show anti-inflammatory, antimicrobial, and neuroprotective activity.
Amelanchier
Amelanchier (serviceberry, juneberry, saskatoon, shadbush) is a Rosaceae genus of about 20 species of North American, European, and Asian shrubs and small trees with white flowers and edible sweet pomes; taxonomy is complicated by polyploidy, apomixis, and hybridization.
Amelanchier alnifolia
Amelanchier alnifolia, the saskatoon berry or Saskatoon serviceberry, is a North American Rosaceae shrub grown for sweet purple pomes rich in anthocyanins, fiber, and minerals; distinct from other serviceberries by alder-like leaves and western prairie range.
Amelanchier ovalis
Amelanchier ovalis (snowy mespilus, garden serviceberry), Medik. 1793, syn. Mespilus amelanchier L., a Rosaceae shrub native from Europe to the Caucasus and NW Africa, with diploid 2n=34 and tetraploid 2n=68 cytotypes and edible bluish-black fruits.
Amentotaxus
Amentotaxus, the catkin yews, is a genus of about seven dioecious conifer species in Taxaceae, native from the eastern Himalaya to central China and Taiwan, sister to Torreya, with a rich Northern Hemisphere fossil record.
Amentotaxus argotaenia
Amentotaxus argotaenia, the catkin yew (穗花杉), is a small dioecious Taxaceae conifer from SE Tibet, southern China, Vietnam, and Laos; IUCN Near Threatened, with silvery-white leaf stomatal bands and red-arilled seeds.
American chestnut
American chestnut (Castanea dentata), eastern US canopy tree killed as a dominant species by chestnut blight (Cryphonectria parasitica) after 1904; restoration via backcross hybrids, hypovirulence, and transgenic Darling 54.
American Fern Journal
American Fern Journal: quarterly peer-reviewed botany journal of the American Fern Society, published since 1910, covering ferns and seed-free vascular plants; ISSN 0002-8444, archived on JSTOR, BioOne, and BHL.
American Fern Society
American Fern Society (AFS), founded 1893, international society for fern and lycophyte study; publishes the American Fern Journal (since 1910) and Fiddlehead Forum, runs a spore exchange and Fern Forays; over 500 members; distinct from the American Filtration and Separations Society and fernsociety.com.
American ginseng (西洋参)
American ginseng (西洋参, Panax quinquefolius), an eastern North American forest herb whose root is prized in East Asian medicine; CITES-listed since 1975, cultivated mainly in Wisconsin and Ontario, with limited clinical evidence for colds and glucose control.
Ammi
Ammi (Bishop's weed genus) is an Apiaceae genus of annual or biennial herbs native from Macaronesia to W Asia, published by Linnaeus in 1753; Ammi majus yields furanocoumarins and causes livestock photosensitization.
Ammi visnaga
Ammi visnaga (khella, toothpickweed; now Visnaga daucoides) is an Apiaceae herb of the Mediterranean whose fruits yield the furanochromones khellin and visnagin, used for renal colic, angina, asthma, and vitiligo phototherapy.
Amomum
Amomum Roxb. is a genus of Zingiberaceae (ginger) herbs native from tropical and subtropical Asia to north Queensland, with about 110 accepted species; it includes large cardamom (Amomum subulatum) and was recircumscribed in 2018.
Amorpha fruticosa
Amorpha fruticosa, the false indigo bush, is a North American legume shrub with purplish blue flowers that has become a major invasive plant in Europe.
Amorphophallus
Amorphophallus (titan arum, konjac, elephant foot yam) is a genus of about 240-246 tuberous aroid herbs native to Africa, Madagascar, Asia, and N. Australia, known for foul-smelling, thermogenic inflorescences and food and medicinal corms.
Amorphophallus konjac
Amorphophallus konjac (konjac, konnyaku, devil's tongue, hua mo yu) is an Araceae tuber from Yunnan, China, cultivated about 2,000 years; its corm stores konjac glucomannan (over 50% of carbohydrates) used for gels, noodles, and supplements.
Amorphophallus paeoniifolius
Amorphophallus paeoniifolius, elephant foot yam (巨花蒟蒻), is an Araceae tuber crop of tropical Asia to northern Australia; its corms to 15 kg are a major carbohydrate food in India and Indonesia, with foul-smelling, heat-generating inflorescences.