+ Laburnocytisus 'Adamii'
+ Laburnocytisus 'Adamii', Adam's laburnum, a graft-chimaera tree combining Cytisus purpureus and Laburnum anagyroides, created accidentally in 1825 by French nurseryman Jean-Louis Adam, bearing yellow, mauve, and intermediate flowers.
× Heucherella
× Heucherella (foamy bells) is an intergeneric hybrid perennial genus, Heuchera × Tiarella in Saxifragaceae, named by Wehrhahn in 1930; sterile garden hybrids grown for colorful evergreen foliage and pink or white foamy flower sprays in shade.
1, 3, 3 trimethyl 4, 6 dioxatricyclo [3. 3. 1. 02, 7] nonane
1,3,3-Trimethyl-4,6-dioxatricyclo[3.3.1.0²,⁷]nonane, or lineatin, is the tricyclic acetal aggregation pheromone (C10H16O2) of the ambrosia beetle Trypodendron lineatum; the (+)-enantiomer (1R,4S,5R,7R) is the natural attractant, and the substance is not approved as an EU pesticide active substance.
2019 in paleobotany
2019 in paleobotany is a summary of significant discoveries and research in the study of fossil plants published during 2019, including early forests, land plant origins, and new taxa.
2021 in paleobotany
2021 in paleobotany: year of the Paratingia wuhaia noeggerathialean fossil resolving the seed plant sister group, Buggs' reinterpretation of Darwin's abominable mystery, and the Chicxulub tropical forest recovery study.
2026 in paleobotany
2026 in paleobotany: year's fossil-plant research, including the 74.6 Ma New Mexico angiosperm forest in Science, Pentasepalous gurhaensis from Eocene India, EPPC 2026 in Münster, and IPC7 in Cape Town.
A rolling stone gathers no moss
A rolling stone gathers no moss: English proverb on constant movement, attributed to Publilius Syrus, in Heywood's 1546 collection; originally a warning against rootlessness, now also praise of freedom, and source of the Rolling Stones' name.
A-choy
A-choy (A菜, Taiwanese lettuce, yu mai tsai) is a leaf lettuce of Lactuca sativa grown in Taiwan and southern China, eaten mainly in stir fries; related to celtuce, whose crown leaves are sold as A-choy.
Abacá
Musa textilis, abacá or Manila hemp, a Philippine banana species whose leaf-sheath fiber is three times stronger than cotton, saltwater resistant, and used for cordage, banknote paper, and textiles.
Abelia
Abelia R.Br. is a small Caprifoliaceae shrub genus from China, Taiwan, and Vietnam with six accepted species, famous for the artificial hybrid Abelia × grandiflora (glossy abelia), bred in Italy before 1886 and widely grown as a non-invasive ornamental.
Abelmoschus
Abelmoschus is a genus of about 13 species of herbs and shrubs in the mallow family, best known for containing okra, a widely cultivated vegetable.
Abies alba
Abies alba, the European silver fir or sapin-blanc, is a large evergreen conifer in the pine family, native from the Pyrenees and Alps to the Carpathians and the Balkans.
Abies balsamea
Abies balsamea, balsam fir (also Canadian balsam, eastern fir), a small to medium boreal conifer of northeastern North America, 12-27 m tall, a popular Christmas tree, pulpwood source, and Least Concern species.
Abies concolor
Abies concolor, white fir or concolor fir, a drought-tolerant fir of western North American mountains, with two varieties, blue-green citrus-scented needles, upright cones, Least Concern status, and wide ornamental and timber use.
Abies grandis
Abies grandis, grand fir (lowland white fir, yellow fir), a tall Pinaceae conifer native from SW Canada to N. California; rapid-growing, shade-tolerant, to 76 m, widely planted in Europe for timber and Christmas trees.
Abies guatemalensis
Abies guatemalensis (Guatemalan fir, pinabete): endangered evergreen fir of southern Mexico, Guatemala, Honduras, and El Salvador; southernmost fir worldwide, CITES Appendix I, threatened by logging and Christmas-greenery harvesting.
Abies koreana
Abies koreana (구상나무), Korean fir, an endangered Pinaceae conifer endemic to South Korean mountains at 1,000–1,900 m, described by E.H. Wilson in 1920, with blue-violet cones and many garden cultivars.
Abies lasiocarpa
Abies lasiocarpa, subalpine fir (also alpine fir, corkbark fir var. arizonica), a western North American fir from Yukon and Alaska to Arizona and New Mexico, dominant in cold high-elevation spruce-fir forests, highly fire-sensitive, with documented range-wide decline.
Abies nordmanniana
Abies nordmanniana, the Nordmann or Caucasian fir, is a conifer native to the mountains of the eastern Black Sea and the dominant Christmas tree species grown in Europe.
Abies procera
Abies procera, noble fir (syn. Abies nobilis), a Pacific Northwest true fir of the Cascade Range and Coast Ranges, the largest Abies species, reaching 70-80 m; shade-intolerant, hybridizes with Abies magnifica, IUCN Least Concern.
Abies religiosa
Abies religiosa, sacred fir or oyamel, a Mexican fir of the Trans-Mexican Volcanic Belt at 2,400-3,600 m; the overwintering host of monarch butterflies, IUCN Least Concern but declining.
Abies sibirica
Abies sibirica, Siberian fir (пихта сибирская), a Pinaceae conifer described by Ledebour in 1833 with the largest range of any Abies, from Eastern Europe to the Russian Far East, hardy to −50 °C and threatened by drought-driven dieback and Polygraphus proximus.
Abies spectabilis
Abies spectabilis (Himalayan silver fir, East Himalayan fir, syn. Abies webbiana) is a Near Threatened Himalayan fir, dominant from about 3,000–4,050 m from Afghanistan to Nepal, studied widely for climate-growth responses.
Abies veitchii
Abies veitchii (シラビソ, shirabiso), known as Veitch's silver fir or Veitch fir, is a fir native to Japan, growing at high elevations on Honshu and Shikoku.
Abies vejarii
Abies vejarii (Vejar fir, hayarín) is a fir described by Martínez in 1942, endemic to Sierra Madre Oriental mountains of northeastern Mexico at 2,200–3,300 m, reaching 40 m, with exserted-bract cones and relict, reduced populations.
Abietic acid
Abietic acid, also called sylvic acid, is the principal resin acid of rosin from conifers, serving as a tree defense and the active agent in soldering flux.
Abrus
Abrus Adans. is a genus of about 17 legume species (Fabaceae, tribe Abreae), pantropical climbers including Abrus precatorius, the rosary pea or jequirity bean, whose red-and-black seeds contain the deadly lectin abrin.
Abrus precatorius
Abrus precatorius (rosary pea, jequirity bean), a Fabaceae vine native to the tropical Old World, bears scarlet seeds containing abrin, a ribosome-inactivating protein over 70 times more toxic than ricin, with no antidote.
Abscisic acid
Abscisic acid (ABA), also historically called dormin or abscissin, is a sesquiterpenoid plant hormone governing stomatal closure, drought and cold stress responses, and seed dormancy via PYR/PYL/RCAR receptor-PP2C-SnRK2 signaling.
Abutilon
Abutilon is a genus of about 176 species of herbs and shrubs in the mallow family, native to the tropics and subtropics of every continent.