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Cotyledon orbiculata is an extremely variable species, one that grows to approximately 1.3 m (4.3 ft) in height. [1] It has gray-green leaves (up to 13 by 7 cm (5.1 by 2.8 in)), which naturally develop a white, powdery substance (known as farina) on their surfaces; this farina helps reflect sunlight and conserve water.
Together with Tylecodon, Kalanchoe and Adromischus, it forms a sister clade to the family's basal Crassula clade. [1] Until the 1960s, some 150 species were included in the genus Cotyledon, [4] but subsequently it was split into at least Adromischus, Dudleya, Rosularia, and Tylecodon, leaving probably less than two dozen species in Cotyledon. [5]
Cotyledon undulata, also known as silver crown or silver ruffles, is a small succulent shrub up to 50 cm tall. It has unusual grey undulating leaves that give it a very sculptural shape. Cotyledon undulata is perhaps the most widely grown Cotyledon. The stems are covered with a thick, white, coating.
Cotyledon from a Judas-tree (Cercis siliquastrum, a dicot) seedling Comparison of a monocot and dicot sprouting. The visible part of the monocot plant (left) is actually the first true leaf produced from the meristem; the cotyledon itself remains within the seed Schematic of epigeal vs hypogeal germination Peanut seeds split in half, showing the embryos with cotyledons and primordial root Two ...
As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root, and then penetrates down into the soil.After emergence of the radicle, the hypocotyl emerges and lifts the growing tip (usually including the seed coat) above the ground, bearing the embryonic leaves (called cotyledons), and the plumule that gives rise to the first true leaves.
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Because the cotyledon is positioned above the ground it is much more vulnerable to damage like night-frost [2] or grazing. Plants that show epigeal germination need external nutrients rather quickly in order to develop, so they are more frequent on nutrient-rich soils. The plants also need relatively more sunlight for photosynthesis to take place.
The Crassulaceae (/ ˈ k r æ s j uː l eɪ s iː ˌ iː,-s i ˌ aɪ /, from Latin crassus, thick), also known as the crassulas, the stonecrops or the orpine family, are a diverse family of dicotyledon angiosperms primarily characterized by succulent leaves and a form of photosynthesis known as crassulacean acid metabolism (CAM), in which plants photosynthesize in the daytime and exchange ...
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