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Lasiodiscus Rozeirae
''Lasiodiscus rozeirae'' is a small tree in the family Rhamnaceae. It was first described in 1958 by Arthur Wallis Exell after a specimen collected by Portuguese botanist Arnaldo Rozeira from São Tomé Island in the Gulf of Guinea The Gulf of Guinea is the northeasternmost part of the tropical Atlantic Ocean from Cape Lopez in Gabon, north and west to Cape Palmas in Liberia. The intersection of the Equator and Prime Meridian (zero degrees latitude and longitude) is in the .... The species has not been found since it was collected in 1954. It is not known whether there is still an extant population. References External links Species report, Conservation Monitoring Centre Trees of Africa Flora of São Tomé Island rozeirae Vulnerable plants {{Rhamnaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Wallis Exell
Arthur Wallis Exell OBE (21 May 1901, in Birmingham – 15 January 1993, in Cheltenham) was initially an assistant and later Deputy Keeper of Botany at the British Museum during the years 1924–1939 and 1950–1962. A noted cryptographer, taxonomist and phytogeographer, he was notable for his furthering of botanical exploration in tropical and sub-tropical Africa, and was an authority on the family Combretaceae. Exell's formal education started at Queen Elizabeth Grammar School in Warwickshire, and then King Edmund's School in Birmingham. From there he went on to Emmanuel College, Cambridge and was awarded an M.A. in 1926, having joined the British Museum as a second-class assistant on 11 August 1924, eventually becoming Deputy Keeper of Botany in 1950. He was entrusted with the Polypetalae, although his first paper was a morphological study of the hymenium in three species of fungus. Exell's first contact with Africa was in 1932/3 when he travelled to the islands in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhamnaceae
The Rhamnaceae are a large family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family. Rhamnaceae is included in the order Rosales. The family contains about 55 genera and 950 species. The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions. The earliest fossil evidence of Rhamnaceae is from the Late Cretaceous. Fossil flowers have been collected from the Upper Cretaceous of Mexico and the Paleocene of Argentina. Leaves of family Rhamnaceae members are simple, i.e., the leaf blades are not divided into smaller leaflets.Flowering Plants of the Santa Monica Mountains, Nancy Dale, 2nd Ed. 2000, p. 166 Leaves can be either alternate or opposite. Stipules are present. These leaves are modified into spines in many genera, in some (e.g. ''Paliurus spina-christi'' and '' Colletia cruciata'') spectacularly so. ''Colletia'' stands out by having two axillary buds instead of one, one developing int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arnaldo Rozeira
Arnaldo Deodato da Fonseca Rozeira (São Tomé and Príncipe, 29 April 1912 — Lordelo do Ouro, 8 March 1984), also known as Arnaldo Rozeira or Arnaldo Roseira, was a botanist, Dean of the Faculty of Sciences of the University of Porto between April 1972 and April 1974, and director of the Botanical Garden of Porto between 1960 and 1974 ( Jardim Botânico do Porto) and again between January and April 1982. Biography He completed his Doctorate in 1944 with the thesis "Flora of Trás-os-Montes and Alto Douro" ("A flora de Trás-os-Montes e Alto Douro"). He was named professor at the University of Porto's Faculty of Sciences in 1949. In 1957, he presented a lecture entitled "Botanical Studies of the Islands of São Tomé and Príncipe. Fundamental Problems" and was later appointed full professor. During his academic career, he made several botanical campaigns in São Tomé and Portugal. He was Director of the Museum of Anthropology in 1958-1959 and Director of the Botanical Institut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
São Tomé Island
São Tomé Island, at , is the largest island of São Tomé and Príncipe and is home in May 2018 to about 193,380 or 96% of the nation's population. The island is divided into six districts. It is located 2 km (1¼ miles) north of the equator. Geography São Tomé Island is about long (north-south) by wide (east-west). It rises to at Pico de São Tomé and includes the capital city, São Tomé, on the northeast coast. The nearest city on mainland Africa is the port city of Port Gentil in Gabon located to the east. The island is surrounded by a number of small islands, including Ilhéu das Rolas, Ilhéu das Cabras and Ilhéu Gabado. Languages The main language is Portuguese, but there are many speakers of Forro and Angolar (Ngola), two Portuguese-based creole languages. The name "Sao Tome" is Portuguese for "Saint Thomas." Geology The entire island of São Tomé is a massive shield volcano that rises from the floor of the Atlantic Ocean, over below sea lev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gulf Of Guinea
The Gulf of Guinea is the northeasternmost part of the tropical Atlantic Ocean from Cape Lopez in Gabon, north and west to Cape Palmas in Liberia. The intersection of the Equator and Prime Meridian (zero degrees latitude and longitude) is in the gulf. Among the many rivers that drain into the Gulf of Guinea are the Niger River, Niger and the Volta River, Volta. The coastline on the gulf includes the Bight of Benin and the Bight of Bonny. Name The origin of the name Guinea is thought to be an area in the region, although the specifics are disputed. Bovill (1995) gives a thorough description: The name "Guinea (region), Guinea" was also applied to south coast of West Africa, north of the Gulf of Guinea, which became known as "Upper Guinea", and the west coast of Southern Africa, to the east, which became known as "Lower Guinea". The name "Guinea" is still attached to the names of three countries in Africa: Guinea, Guinea-Bissau, and Equatorial Guinea, as well as New Guinea in Mel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trees Of Africa
In botany, a tree is a perennial plant with an elongated Plant stem, stem, or trunk (botany), trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. In wider definitions, the taller Arecaceae, palms, Cyatheales, tree ferns, Musa (genus), bananas, and bamboos are also trees. Trees are not a Taxon, taxonomic group but include a variety of plant species that Convergent evolution, have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight. The majority of tree species are angiosperms or hardwoods; of the rest, many are gymnosperms or softwoods. Trees tend to be long-lived, some reaching several thousand years old. Trees have been in existence for 370 million years. It is estimated that there are some three trillion mature trees in the world. A tree typically has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of São Tomé Island
Flora is all the plant life present in a particular region or time, generally the naturally occurring (indigenous) native plants. Sometimes bacteria and fungi are also referred to as flora, as in the terms ''gut flora'' or ''skin flora''. Etymology The word "flora" comes from the Latin name of Flora, the goddess of plants, flowers, and fertility in Roman mythology. The technical term "flora" is then derived from a metonymy of this goddess at the end of the sixteenth century. It was first used in poetry to denote the natural vegetation of an area, but soon also assumed the meaning of a work cataloguing such vegetation. Moreover, "Flora" was used to refer to the flowers of an artificial garden in the seventeenth century. The distinction between vegetation (the general appearance of a community) and flora (the taxonomic composition of a community) was first made by Jules Thurmann (1849). Prior to this, the two terms were used indiscriminately.Thurmann, J. (1849). ''Essai de Phyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lasiodiscus
''Lasiodiscus'', commonly known as red-hair bushes, is a small plant genus in the family Rhamnaceae. It is endemic to Africa and its adjacent islands. Description The small trees have opposite, often asymmetric leaves. As with ''Colubrina'', the flower ovaries are surrounded by a nectariferous disc that fills the receptacle. Habitat They regularly occur in the understorey of tropical forests, or alternatively in swamp forest. One species, ''L. rozeirae'', is limited to mountain forest understorey. Relationships ''Lasiodiscus'' is morphologically similar to ''Colubrina'', which occurs in the Neotropics, Asia and Afrotropics, but preliminary molecular analysis failed to group them as nearest relatives.A phylogenetic analysis of Rhamnaceae using RBCL and TRNL-F plastid DNA sequences, J.E. Richardson et al., American Journal of Botany, 87(9), 2000. Species There are 9 accepted species: * '' Lasiodiscus chevalieri'' Hutch. – * '' Lasiodiscus fasciculiflorus'' Engl. – Sierra Le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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