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| | Rosidae -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-20) |
 | | Rosidae is 1 of the 6 subclasses in the class Magnoliopsida. |
 | | Rosidae includes the largest number of families of all the subclasses, although the vast majority of species belong to only 5 large orders: Fabales (18,000), Myrtales (9,000), Euphorbiales (8,000), Rosales (6,600), and Sapindales
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 | | There are two theories on the evolutionary origin of the Rosidae; in both scenarios the Rosidae arise eventually from the Magnoliidae, but in one theory they arise from that subclass directly, while, in the other, a stage interposed between the two subclasses resembles the Hamamelidae in having reduced flowers and a loss of petals. |
| www.britannica.com /eb/article-9111099?tocId=9111099 (342 words) |
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