unifacial leaf

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• Unifacial cambium — The unifacial cambium produces cells to the interior of its cylinder. These cells differentiate into xylem tissue. Unlike the more common bifacial cambium found in later woody plants, the unifacial cambium does not produce phloem to its exterior …   Wikipedia

• Evolutionary history of plants — Plants have evolved through increasing levels of complexity, from the earliest algal mats, through bryophytes, lycopods, ferns and gymnosperms to the complex angiosperms of today. While the simple plants continue to thrive, especially in the… …   Wikipedia

• hand tool — any tool or implement designed for manual operation. * * * Introduction  any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …   Universalium

• Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… …   Universalium

• Solutrean industry — Short lived stone tool industry that flourished 17,000–21,000 years ago in southwestern France (e.g., at La Solutré and Laugerie Haute) and in nearby areas. The industry is of special interest because of its particularly fine workmanship. In… …   Universalium

• Calamites — Taxobox fossil range = Carboniferous early Permian image width = 280px image caption = A range of Calamites specimens, illustrating the different appearance of fossils preserved under different taphonomic modes. regnum = Plantae divisio =… …   Wikipedia

• Acorales — ▪ plant order       the sweet flag order of flowering plants and the most basal lineage among the monocotyledons (monocotyledon) (monocots), which are characterized by having a single seed leaf. This order contains the single family Acoraceae and …   Universalium