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Horse-tail Ensign
Horse tail, horsetail or horse's tail may refer to: *the tail of a horse * Equisetidae, a subclass of living and extinct plants known as horsetails ** Equisetales, the single extant order of Equisetidae *** Equisetaceae, the horsetail family, the only extant family of Equisetales ****'' Equisetum'', horsetail, the only living genus in Equisetaceae * Cauda equina ('horse's tail'), a bundle of spinal nerves and spinal nerve rootlets in humans * a type of waterfall See also * Horsetail Falls (other) *''Hippuris'', or mare's tail, a flowering plant * Ponytail A ponytail is a hairstyle in which some, most or all of the hair on the head is pulled away from the face, gathered and secured at the back of the head with a hair tie, clip, or other similar accessory and allowed to hang freely from that point ..., a human hairstyle * Tug (banner), a pole with circularly-arranged horse tail hairs, historically flown by Turkic tribes {{disambiguation, plants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tail (horse)
The tail of the horse and other equines consists of two parts, the dock and the skirt. The dock consists of the muscles and skin covering the coccygeal vertebrae. The term "skirt" refers to the long hairs that fall below the dock. On a horse, long, thick tail hairs begin to grow at the base of the tail, and grow along the top and sides of the dock. In donkeys and other members of '' Equus asinus'', as well as some mules, the zebra and the wild Przewalski's horse, the dock has short hair at the top of the dock, with longer, coarser skirt hairs beginning to grow only toward the bottom of the dock. Hair does not grow at all on the underside of the dock. The tail is used by the horse and other equidae to keep away biting insects, and the position and movement of the tail may provide clues to the animal's physical or emotional state. Tail carriage may also be a breed trait. Tails of horses are often groomed in a number of ways to make them more stylish for show or practical f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equisetidae
Equisetidae is one of the four subclasses of Polypodiopsida (ferns), a group of vascular plants with a fossil record going back to the Devonian. They are commonly known as horsetails. They typically grow in wet areas, with whorls of needle-like branches radiating at regular intervals from a single vertical stem. The Equisetidae were formerly regarded as a separate division of spore plants and called Equisetophyta, Arthrophyta, Calamophyta or Sphenophyta. When treated as a class, the names Equisetopsida s.s. and Sphenopsida have also been used. They are now recognized as rather close relatives of the ferns (Polypodiopsida) of which they form a specialized lineage. However, the division between the horsetails and the other ferns is so ancient that many botanists, especially paleobotanists, still regard this group as fundamentally separate at the higher level. Description The horsetails comprise photosynthesising, "segmented", hollow stems, sometimes filled with pith. At the ju ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equisetales
Equisetales is an order of subclass Equisetidae with only one living family, Equisetaceae, containing the genus ''Equisetum'' (horsetails). Classification In the molecular phylogenetic classification of Smith et al. in 2006, Equisetales, in its present circumscription, was held to be the sole member of class Equisetopsida. The linear sequence of Christenhusz et al. (2011), intended for compatibility with the classification of Chase and Reveal (2009) which placed all land plants in Equisetopsida, made it the sole member of subclass Equisetidae Equisetidae is one of the four subclasses of Polypodiopsida (ferns), a group of vascular plants with a fossil record going back to the Devonian. They are commonly known as horsetails. They typically grow in wet areas, with whorls of needle-like ..., equivalent to Smith's Equisetopsida. The placement of Equisetales in subclass Equisetidae has subsequently been followed in the classifications of Christenhusz and Chase (2014) and PPG I (201 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equisetaceae
Equisetaceae, sometimes called the horsetail family, is the only extant family of the order Equisetales, with one surviving genus, ''Equisetum'', which comprises about twenty species. Evolution and systematics Equisetaceae is the only surviving family of the Equisetales, a group with many fossils of large tree-like plants that possessed ribbed stems similar to modern horsetails. '' Pseudobornia'' is the oldest known relative of ''Equisetum''; it grew in the late Devonian, about 375 million years ago and is assigned to its own order. All living horsetails are placed in the genus ''Equisetum''. But there are some fossil species that are not assignable to the modern genus. ''Equisetites'' is a "wastebin taxon" uniting all sorts of large horsetails from the Mesozoic; it is almost certainly paraphyletic and would probably warrant being subsumed in ''Equisetum''. But while some of the species placed there are likely to be ancestral to the modern horsetails, there have been reports ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equisetum
''Equisetum'' (; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of ferns, which reproduce by spores rather than seeds. ''Equisetum'' is a " living fossil", the only living genus of the entire subclass Equisetidae, which for over 100 million years was much more diverse and dominated the understorey of late Paleozoic forests. Some equisetids were large trees reaching to tall. The genus ''Calamites'' of the family Calamitaceae, for example, is abundant in coal deposits from the Carboniferous period. The pattern of spacing of nodes in horsetails, wherein those toward the apex of the shoot are increasingly close together, is said to have inspired John Napier to invent logarithms. Modern horsetails first appeared during the Jurassic period. A superficially similar but entirely unrelated flowering plant genus, mare's tail (''Hippuris''), is occasionally referred to as "horsetail", and adding to confusion, the name "mare's tail" is some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cauda Equina
The cauda equina () is a bundle of spinal nerves and spinal nerve rootlets, consisting of the second through fifth lumbar nerve pairs, the first through fifth sacral nerve pairs, and the coccygeal nerve, all of which arise from the lumbar enlargement and the conus medullaris of the spinal cord. The cauda equina occupies the lumbar cistern, a subarachnoid space inferior to the conus medullaris. The nerves that compose the cauda equina innervate the pelvic organs and lower limbs to include motor innervation of the hips, knees, ankles, feet, internal anal sphincter and external anal sphincter. In addition, the cauda equina extends to sensory innervation of the perineum and, partially, parasympathetic innervation of the bladder. Structure In adulthood, the cauda equina is made of lumbosacral spinal nerve roots. Development In humans, the spinal cord stops growing in infancy and the end of the spinal cord is about the level of the third lumbar vertebra, or L3, at birth. Becau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waterfall
A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several ways, but the most common method of formation is that a river courses over a top layer of resistant bedrock before falling on to softer rock, which erodes faster, leading to an increasingly high fall. Waterfalls have been studied for their impact on species living in and around them. Humans have had a distinct relationship with waterfalls for years, travelling to see them, exploring and naming them. They can present formidable barriers to navigation along rivers. Waterfalls are religious sites in many cultures. Since the 18th century they have received increased attention as tourist destinations, sources of hydropower, andparticularly since the mid-20th centuryas subjects of research. Definition and terminology A waterfall is general ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horsetail Falls (other)
Horsetail Falls or Horsetail Fall may refer to the following waterfalls: Australia *Horsetail Falls (Tasmania, Australia) United States *Horsetail Falls (Oregon) *Horsetail Fall (Yosemite), in California *Horsetail Falls (California), in the Sierra Nevada mountain range *Horsetail Falls (Montana), a waterfall of Montana *Horsetail Falls (Alaska) Keystone Canyon is a gorge near Valdez in the U.S. state of Alaska. Situated at an elevation of , its walls are almost perpendicular. It measures in length, connecting the upper and lower valleys of Lowe River. Geography In Keystone Canyon, ... See also * List of waterfalls by type#Horsetail {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hippuris
''Hippuris'', the mare's tail, was previously the sole genus in the family Hippuridaceae. Following genetic research by the Angiosperm Phylogeny Group, it has now been transferred to the family Plantaginaceae, with Hippuridaceae being reduced to a synonym of Plantaginaceae. It includes one to three species depending on taxonomic interpretation. Some authorities only accept the first species of those listed below, treating the other two as synonyms of it: *Common mare's tail, ''Hippuris vulgaris'' ** Mountain mare's tail, ''Hippuris montana'' ** Fourleaf mare's tail, ''Hippuris tetraphylla'' They are aquatic plants found in shallow ponds and streams, both slow-moving and fast-flowing. This flowering plant is sometimes mistakenly identified as the non-flowering horsetail ''Equisetum'' (; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of ferns, which reproduce by spores rather than seeds. ''Equisetum'' is a "living fossil", the only l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ponytail
A ponytail is a hairstyle in which some, most or all of the hair on the head is pulled away from the face, gathered and secured at the back of the head with a hair tie, clip, or other similar accessory and allowed to hang freely from that point. It gets its name from its resemblance to the tail of a pony. Ponytails are most commonly gathered at the middle of the back of the head or the base of the neck but may also be worn at the side of the head (sometimes considered formal), or on the very top of the head. If the hair is divided so that it hangs in two sections, they are called ''ponytails'', ''twintails'', '' pigtails'', or '' bunches'' if left loose and ''pigtails'', ''plaits'' or ''braids'' if plaited. Ponytails on women and girls The ponytail can be traced back to Ancient Greece, from records of images depicting women with ponytails in ancient Greek artefacts and artworks, such as the frescoes painted millennia ago in Cretes (2000–1500 BC).Sherrow, V., (2019 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
