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Dendrosenecio
''Dendrosenecio'' is a genus of flowering plants in the Asteraceae, sunflower family. It is a segregate (taxonomy), 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 r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Keniodendron
''Dendrosenecio keniodendron'' or giant groundsel is a species of the genus ''Dendrosenecio'' of the large family Asteraceae and is one of the several species of giant groundsels endemic to the high altitudes of the Afrotropic, including ''Dendrosenecio johnstonii'' ('' Senecio battiscombei'') occurring on Mount Kilimanjaro, Mount Kenya, and the Aberdare Mountains, '' Dendrosenecio keniensis'' occurring the lower alpine zone of Mount Kenya and ''D. keniodendron'' occurring in higher and drier sites on Mount Kenya. The giant rosette plants, sometimes tall, often grow in even-sized stands (presumably even-aged), with different understory communities under different-aged stands. Description ''Dendrosenecio keniodendron'' is a giant rosette plant occurring at altitudes between and . '' D. keniensis'' grows in wetter sites, and therefore at lower altitudes on average, but their ranges abut and they occasionally hybridise. Leaves and stems: ''D. keniodendron'' has woody stem ... [...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 - the 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 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 i ... [...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 sl ... [...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 ... [...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. (A "taxon", plural "taxa", is a group of organisms to be given a particular name.) The scientific names ... syn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Keniensis
''Dendrosenecio keniensis'' (syn. ''Senecio keniensis'' and ''S. brassica'') is one of the giant groundsels endemic the higher altitudes of Mount Kenya. It is in the family Asteraceae and the genus ''Dendrosenecio'' (previously a ''Senecio''). ''Dendrosenecio keniodendron'' occurs the upper alpine zone of Mount Kenya and ''D. keniensis'' in the wetter areas of the lower alpine or the moorlands. Description ;Leaves and stems: Prostrate (even subterranean) trunks of soft brittle wood, with trunk to in diameter; which branch repeatedly at or below ground level, forming a large prostrate clone. The branches each support a great cabbage-like, densely packed leaf-rosettes of 30–40 leaves; each branch cloaked with older, dead foliage. Branches produced near ground-level are capable of rooting that supports a "creeping" horizontal growth-form. The leaves are oblong and narrow slightly where they attach to the rosette; they can be up to long and wide. The leaves are capable ... [...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 40 centimeters (17 inches) or more in diameter ... [...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] |
Dendrosenecio Brassiciformis
''Dendrosenecio brassiciformis'' is one of the East African giant groundsel, this one 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 between the altitudes of 2,950 and 3,950 meters (9,700 and 13,000 feet). 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. (A "taxon", plural "taxa", is a group of organisms to be given a particular name.) The scientific names ... 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 bra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendrosenecio Meruensis
''Dendrosenecio meruensis'' is one of the East African giant groundsel, this one is endemic to the slopes of Mount Meru. Once they were considered to be of the genus ''Senecio'' but since then have been reclassified into their own genus ''Dendrosenecio''. Description ''Dendrosenecio meruensis'' an upright plant that can grow to 7 meters tall, with trunks up to 35 centimeters in diameter and pith diameter of 2 centimeters. Leaf- rosettes of 15 to 20 leaves which are somewhat loose around the stem. Leaf bases retained for 1 to 2 meters around the stem and below the leaf-rosette. "Repeated reproduction and branching yields a sprawling, open canopy with up to 10–30 aerial meristems in mature trees." Leaf surfaces are elliptical, 113 centimeters long and 34 centimeters wide, with cushions of hair cushion weakly to strongly developed on upper leaf surface. The lower leaf surface is hairless or with slight small, soft hairs sometimes cobweb-like along lower mid-vein. Inflorescen ... [...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 species t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
