|
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] |
List Of Lepidoptera That Feed On Senecio
''Senecio'' species are used as food plants by the caterpillars of a number of Lepidoptera species including: 320px Arctiidae image:Arctia.caja.caterpillar.jpg, 250px, Garden tiger caterpillar image:Nyctemera amicus.jpg, ''Nyctemera amicus'' image:Hypocrita jacobea larva beentree.jpg, 250px, Cinnabar moth caterpillars * ''Amerila leucoptera'' – Afrotropical * '' Amerila pannosa'' – Afrotropical * '' Arctia caja'', garden tiger – recorded on ''Senecio jacobaea'' in the Nearctic * '' Diacrisia scita'' – recorded on ''Senecio bupleuroides'' in Southern Africa * '' Dysschema picta'' – recorded on '' Senecio brasiliensis'' in Brazil * '' Dysschema sacrifica'' – recorded on ''Senecio brasiliensis'' in Brazil * ''Estigmene acrea'' – recorded on ''Senecio jacobaea'' in the Nearctic * '' Eurata helena'' – recorded on ''Senecio brasiliensis'' in Brazil * '' Eurata strigiventris'' – recorded on ''Senecio brasiliensis'' in Brazil * '' Galtara doriae'' – Afrotropical * '' ... [...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 herb, native to Europe and widely naturalised as a ruderal species in suitable disturbed habitats worldwide. Description ''Senecio vulgaris'' is an erect herbaceous annual growing up to 16 inches (45 cm) tall. The inflorescences usually lack ray florets, the yellow disc florets mostly hidden by the bracts giving the flowers an inconspicuous appearance. ''Senecio 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 ''Senecio vulgaris'' are sessile, lacking their own stem ( petiole), alternating in direction along the length of the plant, two rounded lobes at the base of the stem (auriculate) and sub-clasping above. Leaves are pinnately lobed and + long and wide, smaller towards the top of ... [...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. Pyrrolizidine alkaloids are produced by plants as a defense mechanism against insect herbivores. More than 660 PAs and PA N-oxides have been identified in over 6,000 plants, and about half of them exhibit hepatotoxicity. They are found frequently in plants in the Boraginaceae, Asteraceae, Orchidaceae and Fabaceae families; less frequently in the Convolvulaceae and Poaceae, and in at least one species in the Lamiaceae. 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. Unsaturated pyrrolizidine alkaloids are hepatotoxic, that is, damaging to the liver. PAs also cause hepatic veno-occlusive di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteraceae
The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae were first described in the year 1740. 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 species in each family is unknown. Most species of Asteraceae are annual, biennial, or perennial herbaceous plants, 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 and cold or hot semi-desert climates, and they are found on every continent but Antarctica. The primary common characteristic is the existence of sometimes hundreds of tiny individual florets which are held together by protective involucres in flower heads, or more t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lasiocephalus
''Lasiocephalus'' is a genus of South American flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of ...s in groundsel tribe within the sunflower family. The genus was shown to be part of Senecio 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 formed 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 subspe ... [...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. & Greuter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flower Head
A pseudanthium (Greek for "false flower"; ) 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 zygomo ... [...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; Mongolian script: , , ; lit. "Mongol Nation" or "State of Mongolia" () is a landlocked country in East Asia, bordered by Russia to the north and China to the south. It covers an area of , with a population of just 3.3 millio ... References Senecioneae Asteraceae genera Taxa named by Constantine Samuel Rafinesque {{Senecioneae-stub ... [...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 acanthifolius'', 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 the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the eas ...). References Senecioneae Monotypic Asteraceae genera Flora of South America {{Senecioneae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
