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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] |
Dendrosenecio Kilimanjari
''Dendrosenecio kilimanjari'' is a giant groundsel found on Mount Kilimanjaro in Africa, below . Taxonomy It was originally known as ''Senecio kilimanjari'', but a recent botanical reclassification split off some species formerly in ''Senecio'', putting it and various other species in the new genus '' Dendrosenecio''. Both genera are in the family ''Asteraceae''. The giant groundsels of the genus ''Dendrosenecio'' evolved, about a million years ago, from a ''Senecio'' that established itself on Mount Kilimanjaro, with those that survived adapting into ''Dendrosenecio kilimanjari''. This later colonised other mountains by some means—a standard distance for wind dispersal of seeds is a few metres—and these isolated populations adapted in ways different from the parent population, creating new species. Infraspecific name synonymy The infraspecific name In botany, an infraspecific name is the scientific name for any taxon below the rank of species, i.e. an infraspecif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Elgonensis
''Dendrosenecio elgonensis'' is one of the giant groundsel of East Africa; this one is endemic to Mount Elgon. They used to be considered part of the genus ''Senecio'' but recently have been reclassified to their own genus, ''Dendrosenecio''. Description ''Dendrosenecio elgonensis'' can grow to 7 meters tall, with a trunk to 30 centimeters in diameter and pith 2.5 to 3 centimeters in diameter. ''D. elgonensis'' generally keeps its stem cloaked with its withered and decaying foliage (or with retained leaf-bases after fire) but eventually loses them as bark develops. "Periodic reproduction yields sparsely branched, spreading plants that rarely exceed five reproductive cycles." Leaf surfaces are elliptic or heart-shaped, 97 centimeters long and 32 centimeters wide. The lower portion of the leaves are hairless except for along the mid-vein. Flower heads are presented horizontally. 11 to 13, 24 millimeter long ray florets and 40 to 70 disc florets. Distribution Found on the slopes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Cheranganiensis
''Dendrosenecio cheranganiensis'' is one of the East African giant groundsel, this one endemic to the Cherangani Hills. Once it was a genus of ''Senecio'' but has recently been reclassified as a ''Dendrosenecio''. Description ''Dendrosenecio cheranganiensis'' can grow to 6 meters tall, with trunks up to 25 centimeters in diameter and pith with diameters of 2 centimeters. Leaf-rosettes of 40–70 leaves. Infrequent reproduction makes these giant plants sparsely branched and columnar. They rarely exceed three reproductive cycles. Leaves can be up to 94 centimeters long and 25 centimeters wide. Inflorescence can be 100 centimeters tall and 70 centimeters in diameter. 10 to 13 ray florets 10–13 and 25 to 50 disc florets. Distribution ''D. cheranganiensis'' grows between 2600 and 3400 meters on the slopes of the Cherangani Hills. Infraspecific name In botany, an infraspecific name is the scientific name for any taxon below the rank of species, i.e. an infraspecific taxon or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Erici-rosenii
''Dendrosenecio erici-rosenii'' one of the East African giant groundsel and this one can be found on the Rwenzori Mountains, Virunga Mountains and the Mitumba Mountains. It is a species of the genus ''Dendrosenecio'' and is also a collection of reclassified ''Senecio'' species. Description ''Dendrosenecio erici-rosenii'' grows to 6 meters tall. The old leaves drop off and leave a very slender stem. Flower heads have very prominent yellow ray flowers. Distribution ''Dendrosenecio erici-rosenii'' is found more on sloping, better-drained soils on the Rwenzori, Virunga, and Mitumba mountains between 3,500 and 4,500 meters. It is also found between 4,400 and 5,000 meters but does not produce flowers there. Infraspecific name In botany, an infraspecific name is the scientific name for any taxon below the rank of species, i.e. an infraspecific taxon or infraspecies. The scientific names of botanical taxa are regulated by the ''International Code of Nomenclature for al ... synonym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Adnivalis
''Dendrosenecio adnivalis'' (synonym ''Senecio adnivalis'') is one of the giant groundsels of the mountains of Eastern Africa. ''D. adnivalis'' grows on the Rwenzori Mountains and on the Virunga Mountains in Uganda and the Democratic Republic of Congo. Description ''Dendrosenecio adnivalis'' attains heights of tall, trunk can be 40 centimeters diameter and the pith diameter. The stems have 25 to 60 leaves densely packed in a rosette shape at the top. Old leaves are persistent, withered leaf-bases covering the stalk for 1 to 3 meters below the leaf-rosettes. Leaf surfaces are elliptic to heart shaped and can be long and wide, hairy on the top and not hairy on the bottom. Branched clusters of flowers to tall and wide. The droopy flower heads have 9 to 20 ray florets, 16 millimeters long or no ray florets at all and 90 to 250 disc florets. Distribution The Congo Basin is very wet; humid air is trapped by the mountains and rain falls on most days even in the drier months ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Johnstonii
''Dendrosenecio johnstonii'', formerly ''Senecio johnstonii'', is a species of giant groundsel found in the middle altitudes of Mount Kilimanjaro in Africa. A recent botanical reclassification split off some species formerly in ''Senecio'', putting the giant groundsels in the new genus ''Dendrosenecio''. It also redefined the former species ''Senecio cottonii'', as a subspecies of ''Dendrosenecio johnstonii''. Both genera are in the family ''Asteraceae''. The giant grounsels of the genus ''Dendrosenecio'' evolved, about a million years ago, from a ''Senecio'' that established itself on Mount Kilimanjaro, with those that survived adapting into ''Dendrosenecio kilimanjari''. As it moved down the mountain, the adaptations necessary for the new environment created the new species, ''Dendrosenecio johnstonii''. Various subspecies are found on other mountains. Description ''Dendrosenecio johnstonii'' can be up to 10 meters tall, and grow to or more in diameter. The centre of the stem, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Brassiciformis
''Dendrosenecio brassiciformis'' is a species of East African giant groundsel. It is endemic to the slopes of Aberdare Range and bearing fruit but once, and dying after. Once considered to be of the genus ''Senecio'' but since have been reclassified into their own genus ''Dendrosenecio''. Distribution ''Dendrosenecio brassiciformis'' lives on the Aberdare Range from elevation. Infraspecific name In botany, an infraspecific name is the scientific name for any taxon below the rank of species, i.e. an infraspecific taxon or infraspecies. The scientific names of botanical taxa are regulated by the ''International Code of Nomenclature for al ... synonymy *''Dendrosenecio brassica'' B.Nord. subsp. ''brassiciformis'' (R.E.Fr. & T.C.E.Fr.) B.Nord. *''Dendrosenecio brassiciformis'' (R.E.Fr. & T.C.E.Fr.) Mabb. *''Senecio brassica'' R.E.Fr. & T.C.E.Fr. subsp. ''brassiciformis'' (R.E.Fr. & T.C.E.Fr.) Mabb. *''Senecio brassiciformis'' R.E.Fr. & T.C.E.Fr. References External lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Battiscombei
''Dendrosenecio battiscombei'' (synonym ''Senecio battiscombei'') is one of the giant groundsels that lives on the slopes of Mount Kenya and the Aberdare Range. Like ''Dendrosenecio adnivalis'' on the Ruwenzori Mountains and the Virunga Mountains, ''Dendrosenecio battiscombei'' grows in the lower wetter areas of the Afro-Alpine zone. Infraspecific name synonymy *''Dendrosenecio battiscombei'' (R.E.Fr. & T.C.E.Fr.) E.B.Knox **''Dendrosenecio johnstonii ''Dendrosenecio johnstonii'', formerly ''Senecio johnstonii'', is a species of giant groundsel found in the middle altitudes of Mount Kilimanjaro in Africa. A recent botanical reclassification split off some species formerly in ''Senecio'', putti ...'' (Oliv.) B.Nord. subsp. ''battiscombei'' (R.E.Fr. & T.C.E.Fr.) B.Nord. **''Senecio aberdaricus'' R.E.Fr. & T.C.E.Fr. **''Senecio battiscombei'' R.E.Fr. & T.C.E.Fr. **''Senecio johnstonii'' Oliv. var. ''battiscombei'' (R.E.Fr. & T.C.E.Fr.) Mabb. References External links * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Rosette (botany)
In botany, a rosette is a circular arrangement of leaves or of structures resembling leaves. In flowering plants, rosettes usually sit near the soil, but they can also be at the top of an otherwise naked branch or trunk. Their structure is an example of a Aerial stem modification, modified stem in which the internode (botany), internode gaps between the leaves do not expand, so that all the leaves remain clustered tightly together and at a similar height. Some insects induce the development of Gall, galls that are leafy rosettes. In bryophytes and algae, a rosette results from the repeated branching of the thallus as the plant grows, resulting in a circular outline. Taxonomies Many plant family (taxonomy), families have varieties with rosette Morphology (biology), morphology; they are particularly common in Asteraceae (such as dandelions), Brassicaceae (such as cabbage), and Bromeliaceae. The fern ''Blechnum fluviatile'' or New Zealand Water Fern (''kiwikiwi'') is a rosette plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ralph Anthony Blakelock
Ralph Anthony Blakelock (19151963) was a British botanist Botany, also called plant science, is the branch of natural science and biology studying plants, especially Plant anatomy, their anatomy, Plant taxonomy, taxonomy, and Plant ecology, ecology. A botanist or plant scientist is a scientist who s .... He particularly focused on the research of spermatophites. References External links * 1915 births 1963 deaths 20th-century British botanists {{botanist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Disbrowe Cotton
Arthur Disbrowe Cotton, (15 January 1879 – 27 December 1962) was an English plant pathologist, mycologist, phycologist, and botanist. A.D. Cotton was born in London and educated at King's College School and the Royal College of Science, where he completed a degree in botany in 1901. He became a demonstrator there and subsequently at Owens College, Manchester, where he developed an interest in fungi A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one ..., undertaking research into orchid mycorrhizas. In 1904 he was appointed assistant to George Edward Massee, George Massee, head of mycology and cryptogam, cryptogamic plants at the Royal Botanic Gardens, Kew. Cotton remained at Kew till 1915, officially working on algae, but also making time to pursue his particular interest in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
