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Floral Symmetry
Floral symmetry describes whether, and how, a flower, in particular its perianth, can be divided into two or more identical or mirror-image parts. Uncommonly, flowers may have no axis of symmetry at all, typically because their parts are spirally arranged. Actinomorphic Most flowers are actinomorphic ("star shaped", "radial"), meaning they can be divided into three or more identical sectors which are related to each other by rotation about the center of the flower. Typically, each sector might contain one tepal or one petal and one sepal and so on. It may or may not be possible to divide the flower into symmetrical halves by the same number of longitudinal planes passing through the axis: oleander is an example of a flower without such mirror planes. Actinomorphic flowers are also called radially symmetrical or regular flowers. Other examples of actinomorphic flowers are the lily (''Lilium'', Liliaceae) and the buttercup ('' Ranunculus'', Ranunculaceae). Zygomorphic Zy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peloria In Streptocarpus
Peloria may refer to: *Peloria (festival), an ancient Greek festival. *Floral symmetry, Peloria, is the aberration in which a plant that normally produces zygomorphic flowers produces actinomorphic flowers instead. {{hndis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamiales
The Lamiales (also known as the mint order) are an order of flowering plants in the asterids clade of the Eudicots. Under the APG IV system of flowering plant classification the order consists of 24 families, and includes about 23,810 species and 1,059 genera with representatives found all over the world. Well-known or economically important members of this order include aromatic, culinary, and medicinal herbs such as basil, mint, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender, perilla, lemon verbena, catnip, bee balm, wild dagga, and oriental motherwort, as well as olives, ash trees, teak, foxgloves, lilacs, jasmine, snapdragons, African violets, Jacarandas, Paulownias, butterfly bushes, sesame, and psyllium. Description Plant species within the order Lamiales are eudicots and are herbaceous or have woody stems. Zygomorphic flowers are common, having five petals with an upper lip of two petals and lower lip of three petals, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudanthium
A pseudanthium (; : pseudanthia) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, composite flowers, or capitula, which are special types of inflorescences in which anything from a small cluster to hundreds or sometimes thousands of flowers are grouped together to form a single flower-like structure. Pseudanthia take various forms. The real flowers (the florets) are generally small and often greatly reduced, but the pseudanthium itself can sometimes be quite large (as in the heads of some varieties of sunflower). Pseudanthia are characteristic of the daisy and sunflower family (biology), family (Asteraceae), whose flowers are differentiated into ray flowers and disk flowers, unique to this family. The disk flowers in the center of the pseudanthium are actinomorphic and the corolla (flower), corolla is fused into a tube. Flowers on th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflorescence
In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a main axis (Peduncle (botany), peduncle) and by the timing of its flowering (determinate and indeterminate). Morphology (biology), Morphologically, an inflorescence is the modified part of the Shoot (botany), shoot of spermatophyte, seed plants where flowers are formed on the axis of a plant. The modifications can involve the length and the nature of the internode (botany), internodes and the phyllotaxis, as well as variations in the proportions, compressions, swellings, adnations, connations and reduction of main and secondary axes. One can also define an inflorescence as the reproductive portion of a plant that bears a cluster of flowers in a specific pattern. General characteristics Inflorescences are described by many different charact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protea
''Protea'' () is a genus of South African flowering plants, also called sugarbushes (Afrikaans: ''suikerbos''). It is the type genus of the Proteaceae family. About 92% of the species occur only in the Cape Floristic Region, a narrow belt of mountainous coastal land from Clanwilliam to Grahamstown, South Africa. Most protea species are found south of the Limpopo River. '' Protea madiensis'' grows in Afromontane enclaves across tropical Africa, from Guinea to Sudan, Mozambique, and Angola. '' Protea afra'' ranges from the Cape region to Uganda and Kenya, including in the chaparral zone of Mount Kenya National Park. The extraordinary richness and diversity of species characteristic of the Cape flora are thought to be caused in part by the diverse landscape, where populations can become isolated from each other and in time develop into separate species. Etymology The genus ''Protea'' was named in 1735 by Carl Linnaeus when he was examining male and female plants of a species no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteraceae
Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger family is unclear as the quantity of Extant taxon, extant species in each family is unknown. The Asteraceae were first described in the year 1740 and given the original name Composita, Compositae. The family is commonly known as the aster, Daisy (flower), daisy, composite, or sunflower family. Most species of Asteraceae are herbaceous plants, and may be Annual plant, annual, Biennial plant, biennial, or Perennial plant, perennial, but there are also shrubs, vines, and trees. The family has a widespread distribution, from subpolar to tropical regions, in a wide variety of habitats. Most occur in Hot desert climate, hot desert and cold or hot Semi-arid climate, semi-desert climates, and they are found on ever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dandelions
''Taraxacum'' () is a genus of flowering plants in the family Asteraceae, which consists of species commonly known as dandelions. The scientific and hobby study of the genus is known as taraxacology. The genus has a near-cosmopolitan distribution, absent only from tropical and polar areas. Two of the most common species worldwide, '' T. officinale'' (the common dandelion) and '' T. erythrospermum'' (the red-seeded dandelion), are European species introduced into North America, where they are non-native. Dandelions thrive in temperate regions and can be found in yards, gardens, sides of roads, among crops, and in many other habitats. Like other members of the family Asteraceae, they have very small flowers collected together into a composite flower head. Each single flower in a head is called a ''floret''. In part due to their abundance, along with being a generalist species, dandelions are one of the most vital early spring nectar sources for a wide host of pollin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bellis Perennis
''Bellis perennis'' (), the daisy, is a European species of the family Asteraceae, often considered the archetypal species of the name ''daisy''. To distinguish this species from other plants known as daisies, it is sometimes qualified or known as common daisy, lawn daisy or English daisy. Description ''Bellis perennis'' is a perennial herbaceous plant growing to in height. It has short creeping rhizomes and rosettes of small rounded or spoon-shaped leaves that are from long and grow flat to the ground. The species habitually colonises lawns, and is difficult to eradicate by mowing, hence the term 'lawn daisy'. It blooms from March to September and exhibits the phenomenon of heliotropism, in which the flowers follow the position of the sun in the sky. The flowerheads are composite, about in diameter, in the form of a pseudanthium, consisting of many sessile flowers with white ray florets (often tipped red) and yellow disc florets. Each inflorescence is borne on a single leaf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canna Indica
''Canna indica'', commonly known as Indian shot, African arrowroot, edible canna, purple arrowroot, Sierra Leone arrowroot, is a plant species in the family Cannaceae. It is native to the Americas and naturalized elsewhere. The edible rhizomes are a source of starch. Description ''Canna indica'' is a perennial growing to between , depending on the variety. It is hardy to zone 10 and is frost tender. The plants form an upright, unbranched stem or the overlapping leaf sheaths form a pseudo trunk. It forms branched rhizomes longFAO, "Canna edulis''", accessed 23 Feb 2016. that are divided into bulbous segments and covered in two lines by pale green or purple flaky leaves. The surface of the rhizome is carved by transverse grooves, which mark the base of scales that cover it. From the lower part white and apex rootlets emerge, where there are numerous buds, the leaves sprout, the floral stem and the stems. The very large grains of starch can supposedly be seen with the naked ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valerian (herb)
Valerian (''Valeriana officinalis'', Caprifoliaceae) is a perennial flowering plant native to Eurasia. It produces a catnip-like response in cats. Crude Extract, extracts of valerian root may have sedative and anxiolytic effects; however, the clinical evidence is mixed and debated. It is commonly sold as dietary supplement to promote sleep. A dry ethanol extract of valerian root has been recognized as a medicine for adults with mild symptoms by the European Medicines Agency. Names The name of the herb is derived from the personal name ''Valeria (gens), Valeria'' and the Latin verb (to be strong, healthy). Other names used for this plant include garden valerian (to distinguish it from other ''Valeriana'' species), garden heliotrope (although not related to ''Heliotropium''), setwall (though this originally meant zedoary, from which it is etymologically derived) and all-heal (which is also used for plants in the genus ''Stachys''). ''Valeriana rubra'', red valerian, often grown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pollinator Decline
Pollinator decline is the reduction in abundance of insect and other animal pollinators in many ecosystems worldwide that began being recorded at the end of the 20th century. Multiple lines of evidence exist for the reduction of wild pollinator populations at the regional level, especially within Europe and North America. Similar findings from studies in South America, China and Japan make it reasonable to suggest that declines are occurring around the globe. The majority of studies focus on bees, particularly honeybee and bumblebee species, with a smaller number involving hoverflies and lepidopterans. The picture for domesticated pollinator species is less clear. Although the number of managed honey bee colonies in Europe and North America declined by 25% and 59% between 1985-2005 and 1947-2005 respectively, overall global stocks increased due to major hive number increases in countries such as China and Argentina. Nevertheless, in the time managed honeybee hives increased by 45% ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinction
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and recover. As a species' potential Range (biology), range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxon, Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the Fossil, fossil record) after a period of apparent absence. Over five billion species are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, possibly many times more if microorganisms are included. Notable extinct animal species include Dinosaur, non-avian dinosaurs, Machairodontinae, saber-toothed cats, and mammoths. Through evolution, species arise through the process of specia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
