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) the eigenvalues of the various charge operators are conserved. Absolutely conserved flavour quantum numbers are: In some theories, the individual baryon and lepton number conservation can be violated, if the difference between them () is conserved (see chiral anomaly). All other flavour quantum numbers are violated by the electroweak interactions. Strong interactions conserve all flavours. If there are two or more particles which have identical interactions, then they may be interchanged without affecting the physics. Any (complex) linear combination of these two particles give the same physics, as long as the combinations are orthogonal, or perpendicular, to each other. In