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Xylothamia
''Xylothamia'', the desert goldenrods, is a formerly accepted genus of flowering plants in the family Asteraceae. Until 2003, it was held to contain nine species of shrubs native to the deserts of Mexico and the southwestern United States. , Plants of the World Online divided the nine former species of ''Xylothamia'' among ''Aquilula'', ''Gundlachia (plant), Gundlachia'', and ''Medranoa''. Taxonomy The genus ''Xylothamia'' was first described in 1990 with nine species. Molecular phylogenetics, Molecular phylogenetic studies subsequently showed that these fell into two clades. Four species, including the type (biology), type species of ''Xylothamia'', were most closely related to the Caribbean genus ''Gundlachia (plant), Gundlachia'', and were transferred to that genus by Lowell Edward Urbatsch, Lowell E. Urbatsch and Roland P. Roberts in 2004. , Plants of the World Online accepted the transfer, and treated ''Xylothamia'' as a Synonym (taxonomy), synonym of ''Gundlachia''. Urbatsch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medranoa Purpusii
''Medranoa'' is a genus of flowering plant in the family Asteraceae, native to northeastern Mexico and Texas. The genus was established in 2004, initially with a single species. It was expanded to five species in 2007, incorporating species formerly placed in ''Xylothamia'', and then in ''Chihuahuana'', ''Neonesomia'', and ''Xylovirgata''. Taxonomy The genus ''Xylothamia'' was first described in 1990 with nine species. Molecular phylogenetics, Molecular phylogenetic studies subsequently showed that these fell into two clades. Four species, including the type (biology), type species of ''Xylothamia'', were most closely related to the Caribbean genus ''Gundlachia (plant), Gundlachia'', and were transferred to that genus by Lowell Edward Urbatsch, Lowell E. Urbatsch and Roland P. Roberts in 2004. , Plants of the World Online accepted the transfer, and treated ''Xylothamia'' as a Synonym (taxonomy), synonym of ''Gundlachia''. Urbatsch and Roberts divided the remaining five species be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gundlachia (plant)
''Gundlachia'', commonly called goldenshrub, is a genus of flowering plants in the family Asteraceae. Taxonomy The genus ''Xylothamia'' was first described in 1990 with nine species. Molecular phylogenetic studies subsequently showed that these fell into two clades. Four species, including the type species of ''Xylothamia'', were most closely related to the then Caribbean genus ''Gundlachia'', and were transferred to that genus by Lowell E. Urbatsch and Roland P. Roberts in 2004. One of these species, ''Gundlachia riskindii'', was later transferred to the genus '' Aquilula''. , Plants of the World Online accepted these transfers, treating ''Xylothamia'' as a synonym of ''Gundlachia''. Species , Plants of the World Online accepted five species: * '' Gundlachia corymbosa'' (Urb.) Britton ex Bold. (including ''Gundlachia apiculata'', ''Gundlachia foliosa'' and ''Gundlachia cubana'') – Caribbean to Venezuela * '' Gundlachia diffusa'' (Benth.) Urbatsch & R.P.Roberts – northwest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gundlachia Triantha
''Gundlachia triantha'', the TransPecos goldenshrub or Trans-Pecos desert goldenrod, is a North American species of plants in the sunflower family. It is native to northern Mexico ( Chihuahua, Coahuila, Durango, Nuevo León), with the range extending just over the Río Grande into western Texas in and near Big Bend National Park Big Bend National Park is a List of national parks of the United States, national park of the United States located in West Texas, bordering Mexico. The park has national significance as the largest protected area of Chihuahuan Desert topograph .... ''Gundlachia triantha'' is a shrub up to tall. The plant produces flower heads in clumps of 3–5 at the ends of small branches. Each head contains 3–7 disc flowers but no ray flowers. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flowering Plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed within a fruit. The group was formerly called Magnoliophyta. Angiosperms are by far the most diverse group of Embryophyte, land plants with 64 Order (biology), orders, 416 Family (biology), families, approximately 13,000 known Genus, genera and 300,000 known species. They include all forbs (flowering plants without a woody Plant stem, stem), grasses and grass-like plants, a vast majority of broad-leaved trees, shrubs and vines, and most aquatic plants. Angiosperms are distinguished from the other major seed plant clade, the gymnosperms, by having flowers, xylem consisting of vessel elements instead of tracheids, endosperm within their seeds, and fruits that completely envelop the seeds. The ancestors of flowering plants diverged from the commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic Taxon
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of Genus, genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astereae
Astereae is a tribe of plants in the family Asteraceae that includes annuals, biennials, perennials, subshrubs, shrubs, and trees. They are found primarily in temperate regions of the world. Plants within the tribe are present nearly worldwide divided into over 250 genera and more than 3,100 species, making it the second-largest tribe in the family behind Senecioneae. The Taxonomy (biology), taxonomy of the tribe Astereae has been dramatically changed after both morphologic and molecular evidence suggested that large genera such as ''Aster (genus), Aster'', as well as many others, needed to be separated into several genera or shifted to better reflect the plants' relationships. A paper by R. D. Noyes and L. H. Rieseberg showed that most of the genera within the tribe in North America actually belong to a single clade, meaning they have a common ancestor. This is referred to as the North American clade. Guy L. Nesom and Harold E. Robinson have been involved in the recent work and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
