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Senecio
''Senecio'' is a genus of flowering plants in the daisy family (Asteraceae) that includes ragworts and groundsels. Variously circumscribed taxonomically, the genus ''Senecio'' is one of the largest genera of flowering plants. Description Morphology The flower heads are normally rayed with the heads borne in branched clusters, and usually completely yellow, but green, purple, white and blue flowers are known as well. In its current circumscription, the genus contains species that are annual or perennial herbs, shrubs, small trees, aquatics or climbers. The only species which are trees are the species formerly belonging to '' Robinsonia'' occurring on the Juan Fernández Islands. Chemistry Pyrrolizidine alkaloids are found in all ''Senecio'' species. These alkaloids serve as a natural biocides to deter or even kill animals that would eat them. Livestock generally do not find them palatable. ''Senecio'' species are used as food plants by the larvae of some Lepidoptera spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Senecio Vulgaris
''Senecio vulgaris'', often known by the common names groundsel and old-man-in-the-spring, is a flowering plant in the family Asteraceae. It is an annual plant, annual herbaceous plant, herb, native to the Palaearctic and widely naturalised as a ruderal species in suitable disturbed habitats worldwide. Description ''Senecio vulgaris'' is an erect, herbaceous annual growing up to tall. The inflorescences usually lack ray florets and the yellow disc florets are mostly hidden by the bracts, giving the flowers an inconspicuous appearance. ''S. vulgaris'' is very similar to ''Senecio viscosus'', but ''S. vulgaris'' does not have the glandular hairs and ray florets found in ''S. viscosus''. Leaves and stems Upper leaves of ''S. vulgaris'' are Sessility (botany), sessile, lacking their own stem (petiole (botany), petiole), alternating in direction along the length of the plant, two rounded lobes are at the base of the stem (auriculate) and subclasping above. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrrolizidine Alkaloids
Pyrrolizidine alkaloids (PAs), sometimes referred to as necine bases, are a group of naturally occurring alkaloids based on the structure of pyrrolizidine. Their use dates back centuries and is intertwined with the discovery, understanding, and eventual recognition of their toxicity on humans and animals. History PAs were first discovered in plants in the 19th century, but their toxic effects were not immediately recognized. Instead, many PA-containing plants were traditionally used for medicinal purposes in various cultures around the world. For example, herbs containing PAs were used in traditional Chinese medicine and by Native American tribes for their purported therapeutic properties. It has been estimated that 3% of the world's flowering plants contain pyrrolizidine alkaloids. Honey can contain pyrrolizidine alkaloids, as can grains, milk, offal and eggs. To date (2011), there is no international regulation of PAs in food, unlike those for herbs and medicines. In the ear ... [...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] |
Lasiocephalus
''Lasiocephalus'' is a genus of South American flowering plants in groundsel tribe within the sunflower family. The genus was shown to be part of ''Senecio ''Senecio'' is a genus of flowering plants in the daisy family (Asteraceae) that includes ragworts and groundsels. Variously circumscribed taxonomically, the genus ''Senecio'' is one of the largest genera of flowering plants. Description Mo ...'' and predominantly occurs in tropical alpine-like regions. ; SpeciesFlann, C (ed) 2009+ Global Compositae Checklist [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio
''Dendrosenecio'' is a genus of flowering plants in the sunflower family. It is a segregate of ''Senecio'', in which it forms the subgenus ''Dendrosenecio''. Its members, the giant groundsels, are native to the higher-altitude zones of ten mountain groups in equatorial East Africa, where they form a conspicuous element of the flora. Description They have a giant rosette habit, with a terminal leaf rosette at the apex of a stout woody stem. When they bloom, the flowers form a large terminal inflorescence. Concomitantly, two to four lateral branches are normally initiated. As a result, old plants have the appearance of candelabras the size of telephone poles, each branch with a terminal rosette. Species ''Dendrosenecio'' varies geographically between mountain ranges, and altitudinally on a single mountain. There has been disagreement among botanists as to which populations of ''Dendrosenecio'' warrant recognition as species, and which should be relegated to the status of subsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iocenes
''Iocenes'' is a genus of flowering plants in the daisy family. There is only one known species, ''Iocenes virens'', native to extreme southern South America ( Tierra del Fuego Province in Argentina and Magallanes Region in Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...). References Senecioneae Monotypic Asteraceae genera Flora of Southern America {{Senecioneae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacobaea
''Jacobaea'' is a genus of flowering plants in the tribe Senecioneae and the family Asteraceae. Its members used to be placed in the genus ''Senecio'', but have been separated into the segregate genus ''Jacobaea'' on the basis of molecular phylogenetics in order to maintain genera that are monophyletic. Species The following species are recognised by ''The Plant List'': *'' Jacobaea abrotanifolia'' (L.) Moench *'' Jacobaea adonidifolia'' (Loisel.) Pelser & Veldkamp *'' Jacobaea alpina'' (L.) Moench *'' Jacobaea ambigua'' (Biv.) Pelser & Veldkamp *'' Jacobaea andrzejowskyi'' (Tzvelev) B.Nord. & Greuter *'' Jacobaea aquatica'' (Hill) G.Gaertn., B.Mey. & Scherb. *'' Jacobaea argunensis'' (Turcz.) B.Nord. *'' Jacobaea arnautorum'' (Velen.) Pelser *'' Jacobaea auricula'' (Bourg. ''ex'' Coss.) Pelser *'' Jacobaea boissieri'' (DC.) Pelser *'' Jacobaea borysthenica'' (DC.) B.Nord. & Greuter *'' Jacobaea buschiana'' (Sosn.) B.Nord. & Greuter *'' Jacobaea candida'' (C.Presl) B.Nord. & Gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flower Head
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 (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 is fused into a tube. Flowers on the periphery are zygomorphic and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hasteola
''Hasteola'' is a genus of flowering plants in the daisy family, Asteraceae. ; Species * '' Hasteola kamtschatica'' (Maxim.) Pojark. - Russian Far East, northeastern China, Korea * '' Hasteola praetermissa'' Poljakov - Russian Far East * '' Hasteola robertiorum'' L.C.Anderson - Florida * '' Hasteola robusta'' (Tolm.) Pojark. - Japan, Kuril Islands, Sakhalin * '' Hasteola suaveolens'' (L.) Pojark. - eastern United States * '' Hasteola tschonoskii'' (Koidz.) Pojark. - China, Korea, Mongolia Mongolia is a landlocked country in East Asia, bordered by Russia to the north and China to the south and southeast. It covers an area of , with a population of 3.5 million, making it the world's List of countries and dependencies by po ... References Senecioneae Asteraceae genera Taxa named by Constantine Samuel Rafinesque {{Senecioneae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vendredia
''Robinsonia '' is a genus of plants in the groundsel tribe within the sunflower family. All the species are endemic to the Juan Fernández Islands in the Pacific Ocean, part of the Republic of Chile. The genus is named for the fictional character Robinson Crusoe ''Robinson Crusoe'' ( ) is an English adventure novel by Daniel Defoe, first published on 25 April 1719. Written with a combination of Epistolary novel, epistolary, Confessional writing, confessional, and Didacticism, didactic forms, the ..., purportedly shipwrecked in this chain of islands.Daniel Defoe. 1719. The Life and Strange Surprizing Adventures of Robinson Crusoe, Of York, Mariner: Who lived Eight and Twenty Years, all alone in an un-inhabited Island on the Coast of America, near the Mouth of the Great River of Oroonoque; Having been cast on Shore by Shipwreck, wherein all the Men perished but himself. With An Account how he was at last as strangely deliver'd by Pyrates. London: W. Taylor Species Eigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
