Topic
Usteria
About: Usteria is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 4 citations.
Papers
1 Jan 2013
TL;DR: The study revealed that Loganiaceae is composed of 3 genera: Spigelia, Strychnos and Usteria with 39 species in West Africa as opposed to the 6 genera originally circumscribed in the family.
Abstract: Loganiaceae is a family of trees, shrubs and tendril -bearing liana with 13 genera and about 350 species distributed mainly in the tropics, subtropics and a few in temperate regions of the world but has undergone numerous revisions that have expanded and contracted its circumscription. Herbaria studies prece ded the collections made in several extant forests and National Parks in some countries of West Africa. Four gene regions from nuclear and chloroplast origin were amplified but three were sequenced at the Royal Botanic Gardens Kew, London. The study revealed that Loganiaceae is composed of 3 genera: Spigelia, Strychnos and Usteria with 39 species in West Africa as opposed to the 6 genera originally circumscribed in the family. Two new species: Strychnos tomentosaand Strychnos sp. (species nova - P01860082) are described in West Africa for the first time in this work.
Journal Article•
TL;DR: Morphological characters show 10 clusters at threshold of 47 % similarity, which revealed how Anthocleista and Mostuea species separated out from other species of Loganiaceae.
Abstract: Loganiaceae belongs to the Order Gentianales which consists of the families Apocynaceae, Gelsemiaceae, Loganiaceae, Gentianaceae and Rubiaceae. Several Herbaria samples were studied prior to collection from Forest Reserves and National Parks in Nigeria, Republic of Benin and Ghana – with the aid of collection bags, cutlass, secateurs and ropes. Plants parts, both vegetative and reproductive were assessed with the aid of meter rule and tape rule in their natural environment and in the laboratory. Strychnos species collected were 47 individuals; 35 species were adequately identified. Anthocleista genus consists of nine species, Mostuea - three species while Nuxia, Spigelia and Usteria were monotypic genera. The leaf surfaces within the family are: hirsute, pilose, pubescent, tomentose and glabrous as found in Mostuea hirsuta, Strychnos phaeotricha, Strychnos innocua, Strychnos spinosa and members of Anthocleista species respectively. Morphological characters show 10 clusters at threshold of 47 % similarity. Clusters 1, 2 and 4 revealed how Anthocleista and Mostuea species separated out from other species of Loganiaceae. West African diversities have not been fully explored, there are yet novel plant species in the wild to be conserved before they slip out of our hand and sight. Keywords: Morphology, Loganiaceae, West Africa, cluster Analysis, dendrogram.
1 May 1963
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2013 | 2 |
| 1963 | 1 |