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Potamogeton Polygonifolius
''Potamogeton polygonifolius'' or bog pondweed, is an aquatic plant. It is found in shallow, nutrient-poor, usually acid standing or running water, bogs, fens and occasionally ditches. Description Bog pondweed is a perennial, growing from creeping rhizomes. The stems are up to 0.7 m long, terete and unbranched. The submerged leaves are long (60–160 mm) and fairly narrow (2.5–24 mm), delicate and translucent with long (14–80 mm) petioles, tending to decay rather early in the season, typically once the floating leaves appear. The floating leaves are opaque, 40-105 x 15–70 mm, usually brownish or dark green in colour with a pink tint when young, with inconspicuous secondary veins. There are no turions. The inflorescences are up to 42 mm long and produce numerous small greenish flowers. The fruits are 1.9-2.6 mm x 1.4-1.9 mm, larger than ''P. coloratus'' but smaller than ''P. natans''. Bog pondweed occurs both as terrestrial plants in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terete
Terete is a term in botany used to describe a cross section that is circular, or like a distorted circle, with a single surface wrapping around it.Lichen Vocabulary, Lichens of North America Information, Sylvia and Stephen Sharnoff/ref> This is usually contrasted with cross-sections that are flattened, with a distinct upper surface that is different from the lower surface. The cross-section of a branch in a tree is somewhat round, so the branch is terete. The cross section of a normal leaf has an upper surface, and a lower surface, so the leaf is not terete. However, the fleshy leaves of succulents are sometimes terete. Fruticose lichens are terete, with a roughly circular cross section and a single wrap-around skin-like surface called the cortex, compared to foliose lichens and crustose lichens Crustose lichens are lichens that form a crust which strongly adheres to the substrate (soil, rock, tree bark, etc.), making separation from the substrate impossible without destruction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sphagnum
''Sphagnum'' is a genus of approximately 380 accepted species of mosses, commonly known as sphagnum moss, peat moss, also bog moss and quacker moss (although that term is also sometimes used for peat). Accumulations of ''Sphagnum'' can store water, since both living and dead plants can hold large quantities of water inside their cells; plants may hold 16 to 26 times as much water as their dry weight, depending on the species.Bold, H. C. 1967. Morphology of Plants. second ed. Harper and Row, New York. p. 225-229. The empty cells help retain water in drier conditions. As sphagnum moss grows, it can slowly spread into drier conditions, forming larger mires, both raised bogs and blanket bogs. Thus, sphagnum can influence the composition of such habitats, with some describing sphagnum as 'habitat manipulators'. These peat accumulations then provide habitat for a wide array of peatland plants, including sedges and Calcifuges, ericaceous shrubs, as well as orchids and carnivorous plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton Polygonifolius
''Potamogeton polygonifolius'' or bog pondweed, is an aquatic plant. It is found in shallow, nutrient-poor, usually acid standing or running water, bogs, fens and occasionally ditches. Description Bog pondweed is a perennial, growing from creeping rhizomes. The stems are up to 0.7 m long, terete and unbranched. The submerged leaves are long (60–160 mm) and fairly narrow (2.5–24 mm), delicate and translucent with long (14–80 mm) petioles, tending to decay rather early in the season, typically once the floating leaves appear. The floating leaves are opaque, 40-105 x 15–70 mm, usually brownish or dark green in colour with a pink tint when young, with inconspicuous secondary veins. There are no turions. The inflorescences are up to 42 mm long and produce numerous small greenish flowers. The fruits are 1.9-2.6 mm x 1.4-1.9 mm, larger than ''P. coloratus'' but smaller than ''P. natans''. Bog pondweed occurs both as terrestrial plants in s ... [...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] |
Lobelia Dortmanna
''Lobelia dortmanna'', Dortmann's cardinalflower or water lobelia, is a species of flowering plant in the bellflower family Campanulaceae. This stoloniferous herbaceous perennial aquatic plant with basal leaf-rosettes and flower stalks grows to tall. The flowers are 1–2 cm long, with a five-lobed white to pale pink or pale blue corolla, produced in groups of one to ten on an erect raceme held above the water surface. The fruit is a capsule 5–10 mm long and 3–5 mm wide, containing numerous small seeds.BorealForest''Lobelia dortmanna''/ref>Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. The leaves are almost cylindrical, blunt, 2.5–7.5 cm long and evergreen. They have no functional stomata. It is one of several unrelated species of plants from low nutrient lakes known as isoetids, owing to their superficial similarity to Isoetes. The leaves of ''Lobelia dortmanna'' are, however, easily distinguishable from those of othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equisetum Fluviatile
''Equisetum fluviatile'', the water horsetail or swamp horsetail, is a vascular plant that commonly grows in dense colonies along freshwater shorelines or in shallow water in ponds, swamps, ditches, and other sluggish or still waters with mud bottoms. It is a perennial herbaceous species, growing 30–100 cm (rarely 140 cm) tall with erect dark green stems 2–8 mm in diameter, smooth, with about 10–30 fine ridges. At each joint, the stem has a whorl of tiny, black-tipped scale leaves 5–10 mm long. Many, but not all, stems also have whorls of short ascending and spreading branches 1–5 cm long, with the longest branches on the lower middle of the stem. The side branches are slender, dark green, and have 1–8 nodes with a whorl of five scale leaves at each node. The water horsetail has the largest central hollow of the horsetails, with 80% of the stem diameter typically being hollow. The stems readily pull apart at the joints, and both fertile and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Rostrata
''Carex rostrata'', the bottle sedge or beaked sedge, is a perennial species of sedge in the family Cyperaceae. Range and habitat The species is native to Holarctic fens and can be found in Canada and the northern part of the United States, and most of Europe, including Britain, north to 71° N, and W. Asia, in wet peaty places with a high water table. References rostrata Rostratus (masculine), rostrata (feminine) or rostratum (neuter) is a Latin adjective meaning "beaked, curved, hooked, with a crooked point, or with a curved front". In marine warfare, the term ''beak'' (''rostrum'') referred to the ram bows on wa ... Plants described in 1787 Flora of North America {{Carex-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Nigra
''Carex nigra'' is a perennial species of plants in the family Cyperaceae native to wetlands of Europe, western Asia, northwestern Africa, and eastern North America. Common names include common sedge, black sedge or smooth black sedge. The eastern limit of its range reaches central Siberia, Turkey and probably the Caucasus The Caucasus () or Caucasia (), is a region between the Black Sea and the Caspian Sea, mainly comprising Armenia, Azerbaijan, Georgia, and parts of Southern Russia. The Caucasus Mountains, including the Greater Caucasus range, have historically .... References nigra Plants described in 1753 Taxa named by Carl Linnaeus {{Carex-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ranunculus Flammula
''Ranunculus flammula'', the lesser spearwort, greater creeping spearwort or banewort, is a species of perennial herbaceous plants in the genus ''Ranunculus'' (buttercup), growing in damp places throughout the Boreal Kingdom. It flowers June/July. ''Ranunculus flammula'' is poisonous. It is very closely related to '' R. reptans'', which is distinguished by prostrate and more slender stems, narrower leaves and smaller flowers and is sometimes included within ''R. flammula'' sensu lato as a variety (''R. flammula'' var. ''reptans'' (L.) E. Meyer). In addition to other forms of pollination, this plant is adapted to rain-pollination. Gallery Image:RanunculusFlammula4.jpg Image:ranunculus_flammula.jpeg Image:RanunculusFlammula.jpg File:Ranunculus flammula Prague 2012 2.jpg Illustrations Image:Ranunculus flammula - Sturm.png, ''Ranunculus flammula''Illustration in:Jakob Sturm: ''"Deutschlands Flora in Abbildungen"'',Stuttgart (1796) Image:Ranunculus flammula Sturm46.jpg, ''Ranu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton Polygonifolius River
''Potamogeton'' is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed (''Elodea canadensis''). The genus name means "river neighbor", originating from the Greek ''potamos'' (river) and ''geiton'' (neighbor). Morphology ''Potamogeton'' species range from large (stems of 6 m or more) to very small (less than 10 cm). Height is strongly influenced by environmental conditions, particularly water depth. All species are technically perennial, but some species disintegrate in autumn to a large number of asexually produced resting buds called turions, which serve both as a means of overwintering and dispersal. Turions may be borne on the rhizome, on the stem, or on stolons from the rhizome. Most species, however, persist by perennial creeping rhizomes. In some cases the turions are the only means to differentiate species. The lea ... [...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] |
Potamogeton Distinctus
''Potamogeton distinctus'', the pondweed, is an aquatic plant species in the genus ''Potamogeton''. It is found in slow moving fresh water. It is widely distributed in the east of temperate Asia (the Russian Far East, China and Eastern Asia), tropical Asia (the Indian Subcontinent, Indo-China and Malesia Malesia is a biogeographical region straddling the Equator and the boundaries of the Indomalayan and Australasian realms, and also a phytogeographical floristic region in the Paleotropical Kingdom. It has been given different definitions. The ...) and also grows in the Southwestern Pacific. Description Aquatic herb. References Flora of China Flora of Eastern Asia Flora of Indo-China Flora of Malesia Flora of the Indian subcontinent Flora of the Russian Far East Flora of the Southwestern Pacific Freshwater plants distinctus {{Monocot-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
