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Zingiberales Genera
The Zingiberales are flowering plants forming one of four order (biology), orders in the commelinids clade of Monocotyledon, monocots, together with its sister group, sister order, Commelinales. The order includes 68 Genus, genera and 2,600 species. Zingiberales are a unique though plant morphology, morphologically diverse order that has been widely recognised as such over a long period of time. They are usually large herbaceous plants with rhizome, rhizomatous root systems and lacking an aerial plant stem, stem except when flowering. Flowers are usually large and showy, and the stamens are often modified (staminodes) to also form colourful petal-like structures that attract pollinators. Zingiberales contain eight families that are informally considered as two groups, differing in the number of fertile stamens. A "Banana-families, banana group" of four families appeared first and were named on the basis of large banana-like leaves. Later, a more genetically coherent (Monophyly, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous
The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period. Climate During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. The tropics became restricted to equatorial regions and northern latitudes experienced markedly more seasonal climatic conditions. Geography Due to plate tectonics, the Americas were gradually moving westward, causing the Atlantic Ocean to expand. The Western Interior Seaway divided North America into eastern and western halves; Appalachia and Laramidia. India maintained a northward course towards Asia. In the Southern Hemisphere, Aus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
