Prostrate plants
Special terms
Low-growing plants that form a carpet-like covering on the soil.
Glossary of terms
A reference section with categories and short explanations.
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.
Pseudo-Gothic
Landscape terms
An artistic style, a variety of Romanticism that spread in Europe in the late 18th and early 19th centuries. It influenced the architecture of park structures that imitated medieval Gothic buildings — “knightly” castles, fortresses, etc. (…
Pseudobulb
Special terms
Thickened above-ground stem of many epiphytic orchids, varying in shape from elongated spindle-shaped to bulbously swollen, often covered with longitudinal folds or grooves.
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.
Pumilus
Bonsai terms
Dwarf
Putrefactive infection
Cactus grower terms
An infection that causes plant rot.
Pygmaeus
Bonsai terms
Dwarf
Pylons
Landscape terms
Monumental piers or columns at the entrance to a park, on the central square, and in other ceremonial locations.
Pyramidalis
Bonsai terms
Pyramidal
Pyrophytes
Cactus grower terms
Plants that develop in burned areas.
Quarter
Landscape terms
1) an element of garden-park composition, introduced already in the Middle Ages, with flower beds, gazebos, sculptures: 2) part of a forest-park area bounded by clearings.
Quebrada
Cactus grower terms
A short ravine or gorge, a narrow pass, often lacking streams or drainage.
Quilted
African violet terms
Type of leaf with deeply sunken veins and pronounced convexities between them.
Quincunx
Landscape terms
A method of planting trees in staggered rows in a checkerboard pattern, with crowns pruned into a single line and trunks left clear at the base. It forms a single volume and provides visibility along diagonal directions between the trunks;…
Raceme
Special terms
Type of inflorescence.
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.
Ramp
Landscape terms
A slightly inclined plane that replaces a staircase.
Range
Orchid terms
The territory within which a particular species, genus, or family of plants naturally occurs.
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.
Rejuvenating a violet
African violet terms
Violet rosettes need to be rejuvenated every 2-3 years; during that time the rosette develops a bare stem. Rejuvenation is done by cutting off the top part of the rosette (the crown) and re-rooting it in water. During rejuvenation new root…
Rejuvenating a violet
Special terms
Violet rosettes require mandatory rejuvenation every 2–3 years; during that time the rosette develops a bare stem. Rejuvenation is carried out by cutting off the upper part of the rosette (the crown) and re-rooting it in water. When rejuve…
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.
Relative humidity
Garden terms
The amount of water in the air compared to the saturation level at the same temperature; expressed as a percentage.
Relict plants
Cactus grower terms
Dying out; surviving in small numbers.
Repens
Bonsai terms
Creeping
Replantation
Cactus grower terms
Engraftment (survival) of a detached organ.
Respiration
Garden terms
The process by which the cells and tissues of a plant take up oxygen, resulting in the release of energy required for growth and development.
Reticulatus
Bonsai terms
Cobwebby