Fennel similar spices – anise, star anise, and coriander. In 2014, India produced 60% of the world total of fennel, with China and Bulgaria as leading secondary producers (table). Many species in the family Apiaceae or Umbelliferae are superficially similar to fennel, and some, such as poison hemlock, are toxic, so it is unwise, and potentially extremely dangerous, to use any part of any of these plants as an herb or vegetable unless it can be positively identified as being edible. Dill, coriander, and caraway are similar-looking herbs, but shorter-growing than fennel, reaching only . Dill has thread-like, feathery leaves and
Flavour (particle physics) topness) can characterize the quantum state of quarks, by the degree to which it exhibits six distinct flavours (u, d, s, c, b, t). Composite particles can be created from multiple quarks, forming hadrons, such as mesons and baryons, each possessing unique aggregate characteristics, such as different masses, electric charges, and decay modes. A hadron's overall flavour quantum numbers depend on the numbers of constituent quarks of each particular flavour. All of the various charges discussed above are conserved by the fact that the corresponding charge operators can be understood as "generators of symmetries" that commute with the Hamiltonian. Thus,