Terminology

Botany Terminology

Glossary of acronyms, abbreviations and technical specialized terms used in scientific botany, plant bioinformatics and AI/RAG system development on floristic data.

> Educational information - not a substitute for expert advice.

APG (Angiosperm Phylogeny Group)

The APG system is the molecular phylogeny-based classification of angiosperms, published in successive revisions: APG I (1998), II (2003), III (2009), IV (2016). APG IV is the current taxonomic reference for flowering plants; adopted by POWO/Kew and most global floristic databases.

GBIF (Global Biodiversity Information Facility)

GBIF is the global biodiversity information infrastructure, managed by an intergovernmental organization headquartered in Copenhagen. It aggregates over 2.5 billion species occurrence records, including plants, with download via REST API and SPARQL. Data is under CC BY 4.0 license. URL: gbif.org.

POWO (Plants of the World Online)

POWO is the taxonomic database curated by the Royal Botanic Gardens, Kew (London), listing the accepted names, synonyms and distribution of every vascular plant species. It is the authority source for global botanical nomenclature. URL: powo.science.kew.org.

IPFI (Italian Plant Flora Inventory)

IPFI is the official inventory of Italian vascular flora, updated by a working group coordinated by Pignone and Galasso. Base data is accessible through the Italian Flora Portal and Euro+Med Plantbase. It catalogues approximately 8,195 native vascular entities on the Italian peninsula.

ICN (International Code of Nomenclature)

The ICN (International Code of Nomenclature for algae, fungi, and plants), the Shenzhen Code (2018, updated Madrid 2024), is the international code regulating botanical nomenclature. It establishes principles of priority, legitimacy and name validity, and registration procedures for new names (MycoBank, Index Fungorum, IPNI).

IPNI (International Plant Names Index)

IPNI is the database of scientific names for vascular plants and bryophytes, managed by Royal Botanic Gardens Kew, Harvard University Herbaria and Australian National Herbarium. Each registered name receives a unique IPNI ID, used for standardized citation. URL: ipni.org.

CITES (Convention on International Trade in Endangered Species)

CITES is the international convention regulating trade in threatened animal and plant species. Plants are classified in Appendices I (trade prohibited), II (trade regulated with CITES permit) and III (national protection). Examples of CITES Appendix I plants: _Cycas_ spp., _Saussurea costus_ (Falc.) Lipsch.

IUCN (International Union for Conservation of Nature)

The IUCN manages the Red List of Threatened Species. Categories for plants: EX (Extinct), EW (Extinct in the Wild), CR (Critically Endangered), EN (Endangered), VU (Vulnerable), NT (Near Threatened), LC (Least Concern), DD (Data Deficient). Database available via API: iucnredlist.org.

SPP (Species Plantarum - Linnaeus 1753)

_Species Plantarum_ by Carl von Linné (Linnaeus), published in 1753, is the starting point of modern botanical nomenclature. Every valid species name uses this date as the reference point. The digital edition is available on BHL (Biodiversity Heritage Library, biodiversitylibrary.org).

GIS (Geographic Information System)

GIS are systems for collecting, managing, analysing and visualizing spatial data. In botany, GIS are used for species distribution modelling (SDM), protected area planning and vegetation monitoring. Common data formats for botanical occurrences are GeoJSON, GeoTIFF (remote sensing) and Shapefile (ESRI).

SDM (Species Distribution Model)

An SDM models the potential distribution of a species based on environmental variables (temperature, precipitation, land use) at known occurrence points. Common algorithms: MaxEnt, BioMod2, ensemble models. Outputs are raster habitat suitability maps, used in conservation ecology and invasive species risk assessment.

NDVI (Normalized Difference Vegetation Index)

NDVI is a spectral index (calculated from Near-Infrared and Red satellite image bands) measuring vegetation cover and health. Values from -1 to +1; values > 0.3 indicate dense, active vegetation. Free NDVI products: Sentinel-2 (ESA, Copernicus), Landsat (USGS/NASA).

EVI (Enhanced Vegetation Index)

EVI is a spectral index similar to NDVI but with corrections for atmospheric and soil reflectance. Less prone to saturation in areas with high biomass. Used in remote sensing applications for dense tropical forests.

Taxon

A taxon (pl. taxa) is any taxonomic unit: species, subspecies, variety, form, genus, family, order, etc. The term is rank-neutral. In databases like GBIF, each taxon is identified by a unique numeric usageKey, used in APIs for retrieving occurrences and taxonomic metadata.

Syn. (Synonym)

In botanical nomenclature, a synonym is an unaccepted scientific name for a species, superseded by a valid priority name or recombination. In GBIF and POWO records, each entity lists the accepted name and list of synonyms. Synonym accuracy is critical in RAG systems indexing historical botanical literature.

ssp. / subsp. (Subspecies)

Subspecies is the taxonomic rank below species but above variety. In trinomial nomenclature: _Pinus sylvestris_ L. subsp. _sylvestris_ indicates the nominate subspecies. GBIF manages resolution of infraspecific ranks via the infraspecificEpithet and taxonRank fields in the API.

var. (Varietas)

Variety is an infraspecific rank below subspecies, designating a morphologically distinct variant within a species. Example: _Brassica oleracea_ L. var. _capitata_ L. (cabbage). Cultivated varieties are called cultivars (cv.) and follow the International Code of Nomenclature for Cultivated Plants (ICNCP).

f. (Forma)

Forma is the taxonomic rank below variety, used for minor morphological variants (e.g. flower colour variations). Example: _Fagus sylvatica_ L. f. _purpurea_ (Aiton) C.K.Schneid. (copper beech). In practice, this rank is rare in modern systematics and databases tend not to recognize it as a formal rank.

Specific Epithet

The specific epithet is the second word of the Latin binomial name (e.g. in _Quercus robur_ L., "robur" is the specific epithet). The epithet may be an adjective (declined to match the genus in Latin) or an apposed noun. It must not be used alone without the genus name: "robur" alone does not uniquely identify a species.

Common Name vs. Scientific Name

The common name of a plant varies between regions and languages (e.g. "quercia" in Italian, "oak" in English, "Eiche" in German). The scientific name (_Quercus robur_ L.) is universally unambiguous. In multilingual RAG systems, mapping between common names and scientific names must be handled with entity linking towards GBIF or POWO to avoid ambiguity.

Cormophytes

Cormophytes are plants with a vegetative body differentiated into root, stem and leaf (the "corm"). They include pteridophytes, gymnosperms and angiosperms. The term is used in contrast to thallophytes (algae, fungi, bryophytes without root-like differentiation).

Thallophytes

Thallophytes are organisms with a thallus (body not differentiated into organs) traditionally included in botanical study: algae, fungi (now classified in their own kingdom Fungi) and bryophytes. The term has no formal taxonomic value in modern phylogenetic classification.

Basal Angiosperms

Basal angiosperms (ANA grade: Amborella, Nymphaeales, Austrobaileyales) are the groups of angiosperms that diverge before the separation of monocots and eudicots. _Amborella trichopoda_ Baill. (Amborellaceae, endemic to New Caledonia) is considered the living species closest to the common ancestor of all angiosperms (GBIF usageKey: 2873620).

Monocots (Monocotyledoneae)

Monocots (ca. 60,000 species) are characterized by one cotyledon in the seed, parallel leaf venation, flowers with parts in multiples of 3, fibrous root system, and scattered vascular bundles in the stem. Important families: Poaceae (grasses: _Triticum_, _Oryza_, _Zea_), Liliaceae, Orchidaceae (the most species-rich plant family, ca. 28,000 species). Classified in APG IV as a monophyletic group.

Eudicots (Eudicotyledoneae)

Eudicots are the largest evolutionary lineage of angiosperms (ca. 200,000 species), with tricolporate pollen as a synapomorphy. They include most woody plants (Rosaceae, Fabaceae, Fagaceae, Lamiaceae). The subdivision between core eudicots (Pentapetalae) and basal eudicots is established by APG IV.

Germplasm Bank

A germplasm bank conserves plant genetic material ex situ (seeds, pollen, tissues) from wild and cultivated species. The Svalbard Global Seed Vault (Norway) is the world's primary reserve. In Italy, CREA (Council for Agricultural Research) manages the Germplasm Bank (BSGE). Ex situ conservation complements but does not replace in situ conservation.