By R. Geesink
For the id of a flowering plant step one often is to find to which relatives it belongs. With a few adventure, the households mostly encountered in one's niche are quickly identified, but if facing specimens from different locations, particularly these from the immense and wealthy subtropics and tropics, there's less sure bet. The pertinent literature is frequently no longer on hand because it is usually stumbled on purely in dear, infrequent or imprecise books, or journals, current purely in a number of really expert institutes. primarily just a couple of keys to the households of flowering vegetation of the realm have ever been produced, the simplest identified of which at the present is Hutchinson's Key to the households of flowering vegetation (1973); much less famous are Lemee's Tableau analytique des genres monocotyledones (1941) (incl. Gymnosperms) and his Tableau analytique des genres dicotyledones (1943), and Hansen and Rahn's selection of Angiosperm households by way of a punched-card method (Dansk Bot. Ark. 26, 1969, with additions and corrections in Bot. Tidsskr. sixty seven, 1972, 152-153, and Ibid. seventy four 1979, 177-178). Of notice are also Davies and Cullen's The identity of flowering plant households, second ed. (1979), which, even if, offers simply with the households local or cultivated in North Temperate areas, and Joly's Chaves de identifi iio das familias de plantas vasculares que ocorrem no Brasil, third ed. (1977), that may be necessary in different tropical parts too.