|
Sparganium Emersum
''Sparganium emersum'' is a species of flowering plant in the cat-tail family known by the common names European bur-reed and unbranched bur-reed. It has a circumboreal distribution, occurring throughout the northern latitudes of Eurasia and North America. It is an aquatic plant, growing in shallow water bodies such as ponds and streams. It can become abundant at times. It is a perennial herb producing a floating stem up to 2 meters long. The leaves may be limp and floating or stiff and erect, emerging above the water surface. The leaves are flat and straplike, sometimes with a triangular, keeled base that can help distinguish it from the similar '' Sparganium angustifolium''. It is monoecious, individual plants bearing both male and female inflorescence An inflorescence is a group or cluster of flowers arranged on a Plant stem, stem that is composed of a main branch or a complicated arrangement of branches. Morphology (biology), Morphologically, it is the modified part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anton Rehmann
Antoni Rehman aka Anton Rehman (13 May 1840 Kraków – 13 January 1917 Lwow, Galicia) was a Polish geographer, geomorphologist, botanist and explorer. He published mostly in German journals in Austria and is regarded as an Austrian botanist, as Galicia was at that time part of the Austro-Hungarian Empire. Anton was the son of master chimney sweeps Józef Rehman (1812-1882) and Anna Piotrowski. From 1860 to 1863 he studied science and geography at the Jagiellonian University in Krakow and in 1864 was awarded a PhD. in Botany, after specialising in the bryophytes. In 1865 he explored the steppes of Podolia, the banks of the Dniester and the Tschornohora Mountains in the Ukraine. In 1866-67 he studied the anatomy of plants in Munich with Carl Wilhelm von Naegeli. In 1868 he traveled through southern Russia and a year later was appointed professor of Plant Anatomy at the University of Krakow. Between 1873 and 1874 he traveled to the Caucasus and the Crimea. He traveled through Sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typhaceae
The Typhaceae () are a family of flowering plants, sometimes called the cattail family. The botanical name for the family has been recognized by most taxonomists. Description Members can be recognized as large marsh herbs with alternate two-ranked leaves and a brownish compact spike of unisexual flowers. The plants have creeping rhizomes. The male flowers either lack a perianth or have six scales. They may also have club shaped threads or wedge or spatula shaped scales that are intermingled wit the flowers. They have between two and seven stamens. The female flowers have a perianth of fine hairs or scales. These may be accompanied by slender bracteoles. The ovary is one chambered and contains a single pendulous ovule. The style is simple and the stigma simple and long. The fruit may or may not be stalked and the pericarp may be thick or thin. The seeds are endospermous with a cylindric embryo. Fossils The earliest fossils, including pollen and flowers, have been recovered fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumboreal Region
The Circumboreal Region in phytogeography is a floristic region within the Holarctic Kingdom in Eurasia and North America, as delineated by such geobotanists as Josias Braun-Blanquet and Armen Takhtajan. It is the largest floristic region in the world by area, comprising most of Canada, Alaska, Europe, Caucasus and Russia, as well as North Anatolia (as the southernmost part of the region) and parts of northern New England, Michigan, Minnesota, and the Turtle Mountains of North Dakota. Northern portions of the region include polar desert, taiga and tundra biomes. Many geobotanists divide Eurasian and North American areas into two distinct regions. The continents, however, share much of their boreal flora (e.g. ''Betula nana'', ''Alnus viridis'', ''Vaccinium vitis-idaea'', ''Arctostaphylos uva-ursi''). The flora was severely impoverished during glaciations in the Pleistocene. The region is bordered by Eastern Asiatic, North American Atlantic, Rocky Mountain, Mediterranean an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 grows in or near water and is either emergent, submergent, or floating. In lakes and rivers macrophytes provide cover for fish, substrate for aquatic invertebrates, produce oxygen, and act as food for some fish and wildlife. Macrophytes are primary producers and are the basis of the food web for many organisms. They have a significant effect on soil chemistry and light levels as they slow down the flow of water and capture pollutants and trap sediments. Excess sediment will settle into the benthos aided by the reduction of flow rates caused by the presence of plant stems, leaves and roots. Some plants have the capability of absorbing pollutants into their tissue. Seaweeds are multicellular marine algae and, although their ecologi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sparganium Angustifolium
''Sparganium angustifolium'' is a species of flowering plant in the cat-tail family known by the common names floating bur-reed and narrowleaf bur-reed. It has a circumboreal distribution, occurring throughout the northern latitudes of the Northern Hemisphere. It is an aquatic plant, growing in water up to 2.5 meters deep. Its habitat includes acidic, low-nutrient freshwater bodies such as ponds, lakes, slow-moving streams, and ditches. It can become abundant, practically covering the surface of the water. It is a perennial herb producing a floating stem with long, narrow, flattened leaves which can be quite long, sometimes reaching over two meters. It is monoecious, individual plants bearing both male and female inflorescence An inflorescence is a group or cluster of flowers arranged on a Plant stem, stem that is composed of a main branch or a complicated arrangement of branches. Morphology (biology), Morphologically, it is the modified part of the shoot of sperma ...s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Sexuality
Plant reproductive morphology is the study of the physical form and structure (the Plant morphology, morphology) of those parts of plants directly or indirectly concerned with sexual reproduction. Among all living organisms, flowers, which are the reproductive structures of flowering plant, angiosperms, are the most varied physically and show a correspondingly great diversity in methods of reproduction. Plants that are not flowering plants (green algae, mosses, Marchantiophyta, liverworts, hornworts, ferns and gymnosperms such as conifers) also have complex interplays between morphological adaptation and environmental factors in their sexual reproduction. The breeding system, or how the sperm from one plant fertilizes the ovum of another, depends on the reproductive morphology, and is the single most important determinant of the genetic structure of nonclonal plant populations. Christian Konrad Sprengel (1793) studied the reproduction of flowering plants and for the first time it ... [...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] |
Stamen
The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filament and an anther which contains ''sporangium, microsporangia''. Most commonly anthers are two-lobed and are attached to the filament either at the base or in the middle area of the anther. The sterile tissue between the lobes is called the connective, an extension of the filament containing conducting strands. It can be seen as an extension on the dorsal side of the anther. A pollen grain develops from a microspore in the microsporangium and contains the male gametophyte. The stamens in a flower are collectively called the androecium. The androecium can consist of as few as one-half stamen (i.e. a single locule) as in ''Canna (plant), Canna'' species or as many as 3,482 stamens which have been counted in the saguaro (''Carnegiea gigantea'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.png "Click for more on -> Circumboreal Region")
