This family contains buckwheat, sorrel (but not wood sorrel[?]), rhubarb, and knotgrass[?]. It is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section.
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According to EADS, the maximum speed possible without reheat is Mach 1.5 (although this drops to Mach 1.2 with an air-to-air weapons load). ...