Syntype
Cactus grower terms
One of two or more specimens that served as the basis for the original description when the author did not designate any particular specimen as the holotype.
Glossary of terms
A reference section with categories and short explanations.
Taxon
Cactus grower terms
An individual which, together with others related to it by varying degrees of similarity in properties and characters, makes it possible to distinguish it and its like into a particular taxonomic category; the set of characters and propert…
Taxonomic unit
Cactus grower terms
Any classificatory unit in systematics (form, genus, species, etc.).
Taxonomist
Cactus grower terms
A specialist systematist engaged in taxonomic matters.
Taxonomy
Cactus grower terms
The theory of classification and systematization of plants, often regarded as synonymous with systematics, although systematics is a broader concept, and taxonomy, as a branch of systematics, deals with the methods and rules of plant class…
Tektotype
Cactus grower terms
Fragment of the type taken for microscopic studies.
Temperature regime
Cactus grower terms
Maintaining temperature within the parameters optimal for plant development.
Temporary grafts
Cactus grower terms
A horticultural technique in which a slow-growing cactus is "grown on" a fast-growing rootstock, then is rooted and continues to live on its own roots.
Terminal cephalium
Cactus grower terms
Cephalium (see below), located at the apex of the plant.
Testa
Cactus grower terms
The outer covering of a seed, its seed coat, has recently become an important subject in resolving questions of plant classification through the process of "dactyloscopic" analysis of the surface pattern.
Tissues
Cactus grower terms
A collection of cells. They are divided into three systems: the protective (epidermis), the conducting (vascular), and the fundamental (ground) — all of these are permanent tissues formed by meristematic tissues (meristems).
Tolerant species
Cactus grower terms
Species fully adapted to the biotype and biotope.
Topotype
Cactus grower terms
A specimen collected in the same locality as the type.
Transpiration
Cactus grower terms
The process of plant respiration, the plant-regulated rate of water loss during life processes. The main organs of transpiration in cacti are the epidermal stomata.
Tubercles
Cactus grower terms
Outgrowths, bumps. In lichens, these are specialized outgrowths that have become organs of vegetative reproduction.
Tubular flower (tube-shaped)
Cactus grower terms
A flower with united corolla petals and calyx lobes (sepals) when the perianth is double. Often the petals have a short reflex at the tips.
Turf
Cactus grower terms
The surface layer of soil interwoven with living and dead roots, shoots, and rhizomes of perennial grasses.
Turgor
Cactus grower terms
The turgid state of cells, tissues, and organs of a plant that gives them strength and elasticity due to the uptake of a sufficient amount of water; a characteristic of a cactus reflecting the degree of saturation of the stem with moisture.
Tussock
Cactus grower terms
Group growth form, a collection of plant stems growing closely together and forming dense multi-headed groups.
Variability
Cactus grower terms
Minor morphological differences among individuals of a single species, both within a population and between populations separated from each other by considerable distances.
Variability
Cactus grower terms
The presence of heterogeneity and differences among individuals of the same species.
Variegated plants
Cactus grower terms
Plants with an abnormal distribution of the green pigment — chlorophyll — in their cells, which leads to the appearance of localized color changes on stems (leaves) in the form of patches of various shapes and sizes.
Variety
Cactus grower terms
A taxonomic unit accepted in botany, referring to a group of individuals of a single species that have stable morphological deviations from the "typical" species, which are of minor importance. It occupies a position between subspecies and…
Vascular bundle
Cactus grower terms
A system of several types of tissues interconnected with one another that perform the function of conducting water and nutrients through the plant, in other words — the assemblage of conductive, mechanical, meristematic, and parenchymatous…
Vegetation
Cactus grower terms
The state of active life of a plant, manifested in the uptake of nutrients, growth, development of generative organs and other components of the annual cycle.
Vegetation
Cactus grower terms
The assemblage of plant communities (phytocoenoses) of the planet or its parts.
Vegetation cycle
Cactus grower terms
Periodically recurring phases of growth, flowering, and fruiting, alternating with stagnation (dormancy).
Vegetation degradation
Cactus grower terms
Gradual deterioration, a decline in the level of organization of a plant community, caused by changes in environmental conditions or by human economic activity.
Vegetation period
Cactus grower terms
The time during which a plant exhibits active life processes from awakening in spring until entering winter dormancy.
Vegetative bud
Cactus grower terms
That produces a vegetative shoot after unfolding.
Vegetative hybridization
Cactus grower terms
Change in hereditary constitution and the creation of new forms by crossing plants of different species.
Vegetative organs
Cactus grower terms
Parts of the body of higher plants (root, stem) that perform the main functions of nutrition, growth and exchange of substances with the external environment. They do not participate directly in sexual reproduction, but can serve as organs…
Vegetative reproduction
Cactus grower terms
Asexual, non-seed reproduction of plants in which a new individual is formed by the rooting or grafting of a part of the parent plant. Parts of the stem, leaves, roots, fruits and even individual cells are used for vegetative reproduction.
Virulent pathogen
Cactus grower terms
A pathogenic microorganism, i.e., a microorganism capable of causing disease.
Vitality
Cactus grower terms
The set of an organism's characteristics that determine its degree of viability.
Vitality
Cactus grower terms
The degree of a plant's resistance to environmental disturbances, the intensity of the organism's life processes, the degree and measure of its resilience.
Waiting (aerial) roots
Cactus grower terms
Root primordia that form on the surface of cuttings of plants being rooted or on the lateral shoots ("plantlets") of stems of species prone to producing plantlets. When placed in soil, waiting roots develop, forming a normal root system. S…
Water regime of plants
Cactus grower terms
The process of water exchange. Balance is an optimal water regime; deficit is an unbalanced water regime
Wet rot
Cactus grower terms
Fungal disease of cacti.
Xerophytes
Cactus grower terms
(From Greek xeros - dry and phyton - plant) - plants of dry habitats, adapted to withstand overheating and lack of water (dehydration), characteristic of a given area.