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Potamogeton × Griffithii
''Potamogeton'' × ''griffithii'' is a hybrid pondweed between '' Potamogeton alpinus'' and '' Potamogeton praelongus''. It occurs in oligotrophic, moderate alkalinity lakes. Description ''Potamogeton'' × ''griffithii'' is a sterile hybrid pondweed between red pondweed '' Potamogeton alpinus'' and long-stalked pondweed '' Potamogeton praelongus''. It occurs in clear, oligotrophic, low to moderate alkalinity lakes. It was discovered in 1882 in Llyn Anafon, North Wales by J.E. Griffith, a Victorian botanist, and was named after him by the noted pondweed expert Arthur Bennett. Although intermediate in character between the parents, ''Potamogeton'' x ''griffithii'' is unlikely to be confused with either. It has long, branched stems to at least 1.7 m and probably longer, growing from slender perennial rhizomes. The translucent mid to deep green leaves are typically between 120 and 240 mm long, occasionally reach 330 mm and are 10–25 mm wide and hooded at the tip.Pres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton Alpinus
''Potamogeton alpinus'' is a species of perennial aquatic plant known by the common names alpine pondweed and red pondweed. It is widespread in the northern hemisphere in both rivers and lakes with good water quality. Description Red pondweed is a perennial herb anchoring in the mud substrate via a creeping rhizome. It produces a cylindrical unbranched stem, up to 2.8 m in length. It has sessile lance-shaped submerged leaves that are typically 70–180 mm long and 10–25 mm wide with 4-7 lateral veins on either side and a slightly hooded apex, with an untoothed margin. Floating leaves may also be produced. The inflorescence is a spike of flowers a few centimeters long rising above the water surface. Turion (botany), Turions are absent, but in winter each stem dies back to a resting bud with a short length of root, which acts as a functional turion. Red pondweed is a reasonably distinctive plant and is not likely to be confused with any other pondweed. Early in the gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton Praelongus
''Potamogeton praelongus'', commonly known as whitestem pondweed in North America and long-stalked pondweed in Britain, is a large, perennial aquatic plant in the family Potamogetonaceae. It is widely distributed in lakes and rivers in the northern hemisphere, but is sensitive to poor water quality. Description Long-stalked pondweed has tall stems to 3 m growing from stout, rusty-spotted perennial rhizomes. The stems often change direction between each node, giving a characteristic zig-zagging pattern. The transparent pale to deep green leaves are typically between 60 and 150 mm long but occasionally reach 250 mm and are 14–40 mm wide. The stipules are persistent, open, whitish and translucent, with prominent veins when dry. Floating leaves and Turion (botany), turions are absent. The inflorescences are produced quite early for a pondweed, in May–June, and have 15-20 inconspicuous greenish flowers and held on robust Peduncle (botany), peduncles 80–200 m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligotrophic
An oligotroph is an organism that can live in an environment that offers very low levels of nutrients. They may be contrasted with copiotrophs, which prefer nutritionally rich environments. Oligotrophs are characterized by slow growth, low rates of metabolism, and generally low population density. Oligotrophic environments are those that offer little to sustain life. These environments include deep oceanic sediments, caves, glacial and polar ice, deep subsurface soil, aquifers, ocean waters, and leached soils. Examples of oligotrophic organisms are the cave-dwelling olm; the bacterium " ''Candidatus'' Pelagibacter communis", which is the most abundant organism in the oceans with an estimated 2 × 1028 individuals in total; and the lichens with their extremely low metabolic rate. Etymologically, the word "oligotroph" is a combination of the Greek adjective ''oligos'' (ὀλίγος) meaning "few" and the adjective ''trophikos'' (τροφικός)) meaning "feeding". Plant adaptatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhizome
In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow horizontally. The rhizome also retains the ability to allow new shoots to grow upwards. A rhizome is the main stem of the plant that runs underground horizontally. A stolon is similar to a rhizome, but a stolon sprouts from an existing stem, has long internodes, and generates new shoots at the end, such as in the strawberry plant. In general, rhizomes have short internodes, send out roots from the bottom of the nodes, and generate new upward-growing shoots from the top of the nodes. A stem tuber is a thickened part of a rhizome or stolon that has been enlarged for use as a storage organ. In general, a tuber is high in starch, e.g. the potato, which is a modified stolon. The term "tuber" is often used imprecisely and is sometimes applied to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petiole (botany)
In botany, the petiole () is the stalk that attaches the leaf blade to the stem, and is able to twist the leaf to face the sun. This gives a characteristic foliage arrangement to the plant. Outgrowths appearing on each side of the petiole in some species are called stipules. Leaves with a petiole are said to be petiolate, while leaves lacking a petiole are called sessile or apetiolate. Description The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves, the leaf stalk may be long, as in the leaves of celery and rhubarb, or short. When completely absent, the blade attaches directly to the stem and is said to be sessile. Subpetiolate leaves have an extremely short petiole, and may appear sessile. The broomrape family Orobanchaceae is an example of a family in which the leaves are always sessile. In some other plant groups, such as the speedwell genus '' Veronica'', petiolate and sessile leaves may occur in different species. In the grasses (Poaceae), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turion (botany)
A turion (from Latin turio meaning "shoot") is a type of bud that is capable of growing into a complete plant. A turion may be an underground bud. Many members of the genus ''Epilobium'' are known to produce turions at or below ground level. Some aquatic plant species produce overwintering turions, especially in the genera '' Potamogeton'', ''Myriophyllum'', ''Aldrovanda'' and ''Utricularia''. These plants produce turions in response to unfavourable conditions such as decreasing day-length or reducing temperature. They are derived from modified shoot apices and are often rich in starch and sugars enabling them to act as storage organs. Although they are hardy (frost resistant), it is probable that their principal adaptation is their ability to sink to the bottom of a pond or lake when the water freezes. Because water expands anomalously at lower temperatures, water at is denser than colder water and stays at the bottom, and in this water turions over-winter before rising aga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed on the axis of a plant. The modifications can involve the length and the nature of the 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. The stem holding the whole inflorescence is called a peduncle. The major axis (incorrectly referred to as the main stem) above the peduncle bearing the flowers or secondary branches is called the rachis. The stalk of each flower in the inflorescence is called a pedicel. A flower that is not part of an inflorescence is called a solitary flower and its stalk is al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peduncle (botany)
In botany, a peduncle is a stalk supporting an inflorescence or a solitary flower, or, after fecundation, an infructescence or a solitary fruit. The peduncle sometimes has bracts (a type of cataphylls) at nodes. The main axis of an inflorescence above the peduncle is the rachis. There are no flowers on the peduncle but there are flowers on the rachis. When a peduncle arises from the ground level, either from a compressed aerial stem or from a subterranean stem (rhizome, tuber, bulb, corm), with few or no bracts except the part near the rachis or receptacle, it is referred to as a scape. The acorns of the pedunculate oak are borne on a long peduncle, hence the name of the tree. See also *Pedicel (botany) *Scape (botany) In botany, a scape is a peduncle arising from a subterranean or very compressed stem, with the lower internodes very long and hence few or no bracts except the part near the rachis or receptacle. Typically it takes the form of a long, leafles ... Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Utricularia Minor
''Utricularia minor'', the lesser bladderwort, is a small, perennial carnivorous plant that belongs to the genus ''Utricularia''. It is usually found affixed to the substrate but it can also survive suspended in a body of water. ''U. minor'' is a circumboreal species and is found in North America, Asia, and Europe.Taylor, Peter. (1989). ''The genus Utricularia - a taxonomic monograph''. Kew Bulletin Additional Series XIV: London. See also * List of ''Utricularia'' species References External links * http://www.fs.fed.us/r2/projects/scp/assessments/utriculariaminor.pdf Carnivorous plants of Asia Carnivorous plants of Europe Carnivorous plants of North America minor Minor may refer to: * Minor (law), a person under the age of certain legal activities. ** A person who has not reached the age of majority * Academic minor, a secondary field of study in undergraduate education Music theory *Minor chord ** Barb ... Plants described in 1753 Taxa named by Carl Linnae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isoetes Lacustris
''Isoetes lacustris'', the lake quillwort or Merlin's grass, is a boreal quillwort native on both sides of the northern Atlantic Ocean. Synonyms include ''Isoetes hieroglyphica''. Description The lake quillwort has many long, narrow leaves from 8–20 cm long and 0.5–2 mm broad, widening to 5 mm broad at the base. There is a sac that produces the spores at the bottom of each leaf base. The plant has a very short stem, called a corm, where all the leaves and roots are attached close together. It does not have traditional roots, but instead some of its leaves are modified to act like roots. These pseudo-roots are called rhizomorphs, and are attached to the bottom end of corm. The upper leaves are green and found sprouting in a clump. Reproduction usually takes place during the late summer or early fall. The sacs at the bottom of leaves create two types of spores, female (megaspores, about 0.5 mm diameter) and male (microspores, a few micrometres in diamete ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Callitriche Brutia
''Callitriche brutia'', the pedunculate water-starwort, is a submerged/floating-leaved aquatic plant Aquatic plants are plants that have adapted to living in aquatic environments (saltwater or freshwater). They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that ... in the family Plantaginaceae (though sometimes placed in its own family – Callitrichaceae). It is found in aquatic environments in Europe.Lansdown, R. V. 2008. Water Starworts: Callitriche of Europe. BSBI Handbook No. 11. BSBI. London Description ''Callitriche brutia'' is a long plant that can be seen with many rounded leaves across its stem. It has a bundle of leaves at the top, in a flower-like shape. It can often be seen growing in large amounts in a single area. It often grows directly in water, or very damp areas. Distribution and habitat The habitats ranges from ephemeral pools, lakes and canals to fast-flowing upland rive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bangor University
, former_names = University College of North Wales (1884–1996) University of Wales, Bangor (1996–2007) , image = File:Arms_of_Bangor_University.svg , image_size = 250px , caption = Arms Flag , motto = cy, Gorau Dawn Deall , mottoeng = "The Best Gift is Knowledge" , established = 1884 , type = Public , administrative_staff = , chancellor = George Meyrick , vice_chancellor = Edmund Burke , students = () , undergrad = () , postgrad = () , city = Bangor , state = , country = Wales , coordinates = , campus = Bangor , colours = , other_name = cy, Y Coleg ar y Bryn ("The College on the Hill") , affiliations = EUAUniversities UKUniversity of Wales ACUHEA EIBFS , website bangor.ac.uk, logo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
