Hilum
Cactus grower terms
(From Latin hilum - small thing) - the scar remaining on the seed after its separation from the funiculus.
Glossary of terms
A reference section with categories and short explanations.
Hilum
Cactus grower terms
The point of attachment of the seed in the fruit.
Holotype
Cactus grower terms
A specimen of a plant that the author used as the nomenclatural type. If the author who described the taxon did not designate a holotype, or if the holotype was lost or destroyed, a lectotype or neotype may be designated as a replacement.
Hormones
Cactus grower terms
(From Greek hormao - I set in motion, I stimulate) biologically active substances produced by clusters of specialized plant cells and exerting targeted action on other organs and tissues. Under the control of hormones, all stages of an org…
Humus
Cactus grower terms
High-molecular-weight, dark-colored organic substances of the soil formed from the products of decomposition of plant and animal residues — decomposed organic remains. It is the main component determining soil fertility.
Humus components
Cactus grower terms
Soil fractions of the substrate of natural origin (leaf mould, turf soil, loam) containing humus
Hybrid
Cactus grower terms
(From Latin hybrida, hibrida — mixture) an organism obtained as a result of combining the genetic (hereditary) information of genotypically different (non-identical) organisms.
Hybrid plants
Cactus grower terms
Plants produced by hybridization.
Hybridization
Cactus grower terms
Crossing by pollination of genetically different parental forms of organisms to obtain offspring possessing mixed characteristics of the parental pair; the process of obtaining offspring (hybrids) from dissimilar parents.
Hydroponics
Cactus grower terms
Cultivation of plants without soil on artificial media and in nutrient solutions, including purely water culture.
Hygroscopicity
Cactus grower terms
The ability to absorb and retain water.
Hypocotyl
Cactus grower terms
The hypocotyl is the part of a seedling between the radicle and the cotyledons.
Hypocotyl
Cactus grower terms
Part of the plant located below the cotyledons.
Icotype
Cactus grower terms
A type used for identification but previously not described (cited) in the literature.
Identification
Cactus grower terms
(From Latin identifico - I establish identity, I identify) - as precisely as possible establishing the identity of the plant under consideration to a particular group: species, genus, family, etc.
Inbreeding [intsukht]
Cactus grower terms
(From the English in - in, inside and breeding - breeding) the crossing of organisms that have common ancestors, close inbreeding, as well as pollination with one's own pollen. According to one view, it is believed that in inbreeding there…
Individual
Cactus grower terms
A single living organism possessing all the characteristics of the species to which it belongs, while at the same time having morphological and physiological features that distinguish it from other organisms of the same species.
Inhibitors
Cactus grower terms
(From Latin inhibeo - I restrain, I stop) - substances of diverse chemical nature that suppress the catalytic activity of individual enzymes or enzyme systems. In a broad sense, the term is used to denote substances that slow down various …
Insolation
Cactus grower terms
Influx of solar radiation to the Earth's surface. Depends on the sun's altitude above the horizon, the orientation of the surface, elevation above sea level, the state of the atmosphere, etc.
Intact tissues
Cactus grower terms
Part of the plant not affected by rot.
Integument
Cactus grower terms
(From Latin integumentum - covering, coat) - the covering of the ovule, later developing into the seed coat. One distinguishes the inner integument, in the form of a thin membrane covering the embryo; and the outer one - a dense structure …
Introduced plants
Cactus grower terms
Plants introduced into the local flora by humans or by other means, but not firmly established in it.
Introduction
Cactus grower terms
Intentional or accidental transfer of individuals of a plant species beyond its area of distribution.
Isomorphism
Cactus grower terms
Similarity of organs in two different plant species.
Juvenile form
Cactus grower terms
Structural features of a young plant that distinguish it from the adult. Compiled by E. Ivanova (Based on materials from the journal "Cactus Club", the book "Cacti for Beginners" by Y.N. Belous, T.V. Goloha, Moscow: EXMO-Press; Donetsk: SK…
Juvenile plants
Cactus grower terms
Plants of young age until the period of formation of reproductive organs, i.e., flowering.
Kuchilyak
Cactus grower terms
Hilly elevations representing outcrops of ancient crystalline rocks. They may have a complex profile as a result of weathering or flat "table" tops.
Leaf mold
Cactus grower terms
Soil composed of decayed leaves - leaf mold
Lectotype
Cactus grower terms
A specimen selected as the nomenclatural type from the original material not by the author of the description but by subsequent researchers (in the absence or loss of the holotype)
Life form
Cactus grower terms
1. The external appearance of plants reflecting their adaptability to environmental conditions. 2. A unit of ecological classification of plants with a similar adaptive structure.
Lignification
Cactus grower terms
See lignification.
Lignification
Cactus grower terms
The final phase of cellular life, when cell walls become rigid and strong and the cells ultimately die.
Litter
Cactus grower terms
Dead plant parts that have fallen onto the soil surface and constitute the main portion of the decomposition products that form the soil's organic structure.
Lomas
Cactus grower terms
The plant formation of the Pacific coastal deserts of South America, which includes ephemerals, epiphytes, etc., whose vegetation occurs in the winter and spring periods under the influence of frequent fogs and drizzle (garua).
Magnesium deficiency
Cactus grower terms
A diseased condition of a plant caused by a shortage of magnesium in the soil.
Matting
Cactus grower terms
Entangling, sticking together, clumping of the pubescence of areoles under the action of water that has fallen on them.
Mechanism of negative phototropism
Cactus grower terms
The ability of a plant or its parts to grow in a direction opposite to that of the sun's rays, i.e., to grow into the "dark".
Meiosis
Cactus grower terms
(From Greek meiosis - diminution) - a special type of cell division that results in a reduction (decrease) in the number of chromosomes and the transition of the cell from the diploid state to the haploid state.
Meristem
Cactus grower terms
Formative plant tissue capable of cell division and producing new cells that ensure additional growth. Distinctions are made between the primary meristem in the region of the shoot apex or root tips, the secondary meristem located in the c…
Mesophytes
Cactus grower terms
(From Greek metos - middle, intermediate and phyton - plant) plants that live in conditions of more or less sufficient, but not excessive, moisture (an intermediate position between xerophytes and hygrophytes).