Don't panic. The flowers of members of this family are aggregated within a composite grouping known as an inflorescence, which in this family is known as a head. Knows how to play every single sport and instrument. In some species, the head is entirely composed of disk florets, and is known as a discoid head. Vernoniaceae Burmeist. Some other species in the aster family are important weeds of pastures because they are very spiny, and livestock cannot eat them. The Jerusalem artichoke (Helianthus tuberosus )is a perennial sunflower, native to the prairies of North America. The ray florets of these latter relatively complex inflorescences are commonly sterile, and are only designed to aid in attracting pollinating insects. These occur, for example, in the tansies (Tanacetum spp.). Clearly, the judging a plant as an aesthetic weed is a matter of perspective and context. //. Presl. 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