|
Johann's Pinyon
''Pinus johannis'', the Johann's pine, is a pine in the pinyon pine group, native to North America. The range extends from southeast Arizona and southwest New Mexico, United States, south in Mexico along the Sierra Madre Occidental and the Sierra Madre Oriental to southern Zacatecas and San Luis Potosí. It occurs at moderate to high altitudes, from , in cool, dry climate conditions. Description ''Pinus johannis'' is a small to medium-size tree, often just a shrub, reaching tall and with a trunk diameter of up to . The bark is grey-brown, thin and scaly at the base of the trunk. The leaves ('needles') are in mixed fascicles of three and four, slender, long, and deep green to blue-green, with stomata confined to a bright white band on the inner surfaces. The cones are globose, long and broad when closed, green at first, ripening yellow-brown when 16–18 months old, with only a small number of thin, fragile scales, typically 6-12 fertile scales. The cones open to broad wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marie-Françoise Robert
Marie-Françoise or Marie Françoise is a given name. Notable people with the name include: * Ghislaine Marie Françoise Dommanget (1900–1991), French actress * Marie Françoise Sophie Gay (1776–1852), French author *Marie-Françoise André, French geographer * Marie-Françoise Audollent (1943–2008), French actress * Marie-Françoise Baslez (1946–2022), French historian and academic * Marie Françoise Catherine de Beauvau-Craon (1711–1786), French noblewoman * Marie-Françoise Bechtel (born 1946), French politician * Marie-Françoise Bougaran (1850–1875), French serial killer * Marie-Françoise Bucquet (1937–2018), French pianist * Marie-Françoise Clergeau (born 1948), French politician * Marie-Françoise Corot (1768–1851), French fashion designer * Marie-Françoise Dubois (born 1948), French middle-distance runner * Marie-Françoise Grange-Prigent (born 1961), French canoeist * Marie-Françoise Guédon, Canadian anthropologist and professor of religious studies * Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stomata
In botany, a stoma (: stomata, from Greek ''στόμα'', "mouth"), also called a stomate (: stomates), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange between the internal air spaces of the leaf and the atmosphere. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that regulate the size of the stomatal opening. The term is usually used collectively to refer to the entire stomatal complex, consisting of the paired guard cells and the pore itself, which is referred to as the stomatal aperture. Air, containing oxygen, which is used in respiration, and carbon dioxide, which is used in photosynthesis, passes through stomata by gaseous diffusion. Water vapour diffuses through the stomata into the atmosphere as part of a process called transpiration. Stomata are present in the sporophyte generation of the vast majority of land plants, with the exception of liverworts, as well as so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinus Orizabensis
''Pinus orizabensis'', the Orizaba pinyon, is a pine in the pinyon pine group, endemic to central Mexico. It is considered also as a sub-species of ''Pinus cembroides'' which is classified as ''Pinus cembroides'' subsp. ''orizabensis'' D.K.Bailey. It has larger seeds than the type. The range is localised, confined to a small area in the eastern Eje Volcánico Transversal range (Trans-Mexican Volcanic Belt), in the states of Puebla and Veracruz. It occurs at high altitudes, mostly from , in a cooler, moister climate than the other pinyon pines. Description It is a small to medium-size tree, reaching tall and with a trunk diameter of up to 50 cm. The bark is dark brown, thick and deeply fissured at the base of the trunk. The leaves ('needles') are in mixed fascicles of three and four, slender, 3–6 cm long, and deep green to blue-green, with stomata confined to a bright white band on the inner surfaces. Cones The cones are globose to ovoid, 4–7 cm long and 3� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resin
A resin is a solid or highly viscous liquid that can be converted into a polymer. Resins may be biological or synthetic in origin, but are typically harvested from plants. Resins are mixtures of organic compounds, predominantly terpenes. Common resins include amber, hashish, frankincense, myrrh and the animal-derived resin, shellac. Resins are used in varnishes, adhesives, food additives, incenses and perfumes. Resins protect plants from insects and pathogens, and are secreted in response to injury. Resins repel herbivores, insects, and pathogens, while the volatile natural phenol, phenolic compounds may attract benefactors such as predators of insects that attack the plant. Composition Most plant resins are composed of terpenes. Specific components are alpha-Pinene, alpha-pinene, pinene, beta-pinene, carene, delta-3 carene, and sabinene, the monocyclic terpenes limonene and terpinolene, and smaller amounts of the tricyclic sesquiterpenes, longifolene, caryophyllene, and cad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different varieties, subspecies, species or genera through sexual reproduction. Generally, it means that each cell has genetic material from two different organisms, whereas an individual where some cells are derived from a different organism is called a chimera. Hybrids are not always intermediates between their parents such as in blending inheritance (a now discredited theory in modern genetics by particulate inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridization, which include genetic and morph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pollination
Pollination is the transfer of pollen from an anther of a plant to the stigma (botany), stigma of a plant, later enabling fertilisation and the production of seeds. Pollinating agents can be animals such as insects, for example bees, beetles or butterflies; birds, and bats; water; wind; and even plants themselves. Pollinating animals travel from plant to plant carrying pollen on their bodies in a vital interaction that allows the transfer of genetic material critical to the reproductive system of most flowering plants. Self-pollination occurs within a closed flower. Pollination often occurs within a species. When pollination occurs between species, it can produce hybrid (biology), hybrid offspring in nature and in plant breeding work. In angiosperms, after the pollen grain (gametophyte) has landed on the stigma (botany), stigma, it germinates and develops a pollen tube which grows down the style (botany), style until it reaches an ovary (botany), ovary. Its two gametes travel down ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variety (biology)
In botanical nomenclature, variety (abbreviated var.; in ) is a taxonomic rank below that of species and subspecies, but above that of form. As such, it gets a three-part infraspecific name. It is sometimes recommended that the subspecies rank should be used to recognize geographic distinctiveness, whereas the variety rank is appropriate if the taxon is seen throughout the geographic range of the species. Example The pincushion cactus, ''Escobaria vivipara'', is a wide-ranging variable species occurring from Canada to Mexico, and found throughout New Mexico below about . Nine varieties have been described. Where the varieties of the pincushion cactus meet, they intergrade. The variety ''Escobaria vivipara'' var. ''arizonica'' is from Arizona, while ''Escobaria vivipara'' var. ''neo-mexicana'' is from New Mexico. Definitions The term is defined in different ways by different authors. However, the International Code of Nomenclature for Cultivated Plants, while recognizing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinus Cembroides
''Pinus cembroides'', also known as pinyon pine, Mexican pinyon, Mexican nut pine, and Mexican stone pine, is a pine in the pinyon pine group. It is a small pine growing to about with a trunk diameter of up to . It is native to western North America. It grows in areas with low levels of rainfall and its range extends southwards from Arizona, Texas and New Mexico in the United States into Mexico. It typically grows at altitudes between . The seeds are large and form part of the diet of the Mexican jay and Abert's squirrel. They are also collected for human consumption, being the most widely used pine nut in Mexico. Description ''Pinus cembroides'' is a small to medium-size tree, reaching tall and with a trunk diameter of up to . The bark is dark brown, thick and deeply fissured at the base of the trunk. The leaves ('needles') are in mixed pairs and threes, slender, to long, and dull yellowish green, with stomata on both inner and outer surfaces. The cones are globose, to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elbert L
Elbert is a name that derived from the Germanic ''Alibert'' and may refer to: People Given name * Elbert Andrews (1901–1979), American baseball player * Elbert Dysart Botts (1893–1962), American engineer * Elbert Adrain Brinckerhoff (1838–1913), American merchant and mayor * Elbert Caraway (1905–1975), American football and baseball player and coach * Elbert Frank Cox (1895–1969), American mathematician * Elbert Crawford (1966–2013), American football player * Elbert Dijkgraaf (born 1970), Dutch economist and politician * Elbert Allen Drummond (1943–2012), American heir, businessman and philanthropist * Elbert Drungo (1943–2014), American football offensive lineman * Elbert Dubenion (1933–2019), American football flanker * Elbert Eatmon (1914–1998), American professional baseball pitcher * Elbert H. English (1816–1884), associate justice of the Arkansas Supreme Court * Elbert Floyd-Jones (1817–1901), American politician * Elbert Foules (born 196 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dioecious
Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is biparental reproduction. Dioecy has costs, since only the female part of the population directly produces offspring. It is one method for excluding self-fertilization and promoting allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Plants have several other methods of preventing self-fertilization including, for example, dichogamy, herkogamy, and self-incompatibility. In zoology In zoology, dioecy means that an animal is either male or female, in which case the synonym gonochory is more often used. Most animal species are gonochoric, almost all vertebrate species are gonochoric, and all bird and mammal species are gonochoric. Dioecy may also describe colonies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexican Jay
The Mexican jay (''Aphelocoma wollweberi'') Etymology: ''Aphelocoma'', from Latinized Ancient Greek ''apheles-'' (from ἀφελής-) "simple" + Latin ''coma'' (from Greek ''kome'' κόμη) "hair", in reference to the lack of striped or banded feathers in this genus, compared to other jays. ''wollweberi'', Name: "collector Mr. Wollweber". formerly known as the gray-breasted jay, is a New World jay native to the Sierra Madre Oriental, Sierra Madre Occidental, and Central Plateau of Mexico and parts of the southwestern United States. In May 2011, the American Ornithologists' Union voted to split the Mexican jay into two species, one retaining the common name Mexican jay and one called the Transvolcanic jay. The Mexican jay is a medium-sized jay with blue upper parts and pale gray underparts. It resembles the Woodhouse's scrub-jay, but has an unstreaked throat and breast. It feeds largely on acorns and pine nuts, but includes many other plant and animal foods in its diet. It has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
