Potting mix
Cactus grower terms
Growing medium for plants composed of various components.
Glossary of terms
A reference section with categories and short explanations.
Prefloral tissue
Cactus grower terms
We were unable to find this term in the available domestic and foreign literature. Botanists at the Main Botanical Garden of the Russian Academy of Sciences were also unable to explain its meaning.
Pricking out
Cactus grower terms
Transplanting seedlings.
Primordium
Cactus grower terms
A group of cells from which the development of an organism begins (primordium bud, flower bud).
Proliferation (prolification)
Cactus grower terms
The formation of a plant organ from another organ whose development has ended. For example, the sprouting of a flower or fruit, resulting in the appearance on them of a shoot, a new fruit, or a flower.
Propagation by cuttings
Cactus grower terms
A method of vegetative propagation of plants that involves cutting off a part of the stem followed by rooting.
Prototype
Cactus grower terms
Presumed ancestral (mother, progenitor) form from which the other species of this group may have originated.
Psammophytes
Cactus grower terms
Plants adapted to living in sandy habitats, able to resist being blown away and being buried.
Pseudocephalium
Cactus grower terms
A specific formation on the lateral surface of stems in their upper part, forming a dense pubescence of areoles. It differs from a true cephalium in that the ribs are not modified and the areoles do not become closely spaced.
Pubescence
Cactus grower terms
Presence of hair-like outgrowths on the epidermis of many plants.
Pulp
Cactus grower terms
The flesh of a juicy fruit.
Putrefactive infection
Cactus grower terms
An infection that causes plant rot.
Pyrophytes
Cactus grower terms
Plants that develop in burned areas.
Quebrada
Cactus grower terms
A short ravine or gorge, a narrow pass, often lacking streams or drainage.
Radial spines
Cactus grower terms
Spines located on the periphery of the areole.
Radicle emergence
Cactus grower terms
The emergence of the embryonic root through the rupture of the testa during seed germination.
Radish-like roots
Cactus grower terms
(Not napiform) thickening of the taproot.
Rarity
Cactus grower terms
Rarity, a rare specimen; an exceptionally rare plant both in terms of being held in collections and of occurring in natural conditions.
Receptacle
Cactus grower terms
The upper expanded part of the pedicel.
Receptaculum
Cactus grower terms
(Lat. term receptaculum - receptacle - the axis of the flower on which the sepals, petals, stamens, carpels are arranged) - a term used by many cactologists to denote the receptacle specific to all higher cacti.
Recessive
Cactus grower terms
(From Latin recessus - retreat, removal) - an allele whose phenotypic expression in the heterozygote is masked by the dominant allele.
Reciprocal crosses
Cactus grower terms
(From Latin reciprocus - mutual) - two crosses characterized by a mutually opposite combination of the trait under study and the sex of the forms participating in these crosses.
Reduction
Cactus grower terms
Decrease in size of plant organs or tissues.
Regeneration
Cactus grower terms
Restoration by a living organism of lost body parts.
Relative humidity
Cactus grower terms
Expressed as the ratio of the concentration of water vapor contained in the air to its maximum saturated state at a given air temperature. As temperature increases, relative humidity decreases.
Relict plants
Cactus grower terms
Dying out; surviving in small numbers.
Replantation
Cactus grower terms
Engraftment (survival) of a detached organ.
Rhizoctoniosis
Cactus grower terms
Fungal disease of cacti.
Root collar
Cactus grower terms
The point where the roots transition into the stem.
Root hairs
Cactus grower terms
Absorbing, dying off as the root grows.
Root parasites
Cactus grower terms
Plant pests that damage roots.
Root primordia
Cactus grower terms
Groups of cells from which new roots develop.
Root suckers
Cactus grower terms
Shoots arising from adventitious buds.
Root system
Cactus grower terms
The collection of a plant's underground roots. The taproot system has a primary root and lateral roots; the fibrous or fasciculate system — the primary root is weakly developed or dies early, and adventitious roots form a cluster, a fascic…
Rooting
Cactus grower terms
The process of root formation.
Rootlets
Cactus grower terms
Thin lateral root branches that break off when the root is removed from the soil.
Rootstock segments
Cactus grower terms
Parts of a long cactus shoot, each of which is used as a rootstock without being rooted.
Rootstocks
Cactus grower terms
Plants onto which scions are grafted. They primarily perform the function of roots, and their task is to actively supply the scion (see below) with nutrients.
Savannas
Cactus grower terms
Predominantly flat areas with a predominance of red-brown soils. Herbaceous cover predominates in combination with individual trees or groups of trees.
Scale insect
Cactus grower terms
Insect pest.