By R. Geesink
For the id of a flowering plant step one often is to find to which family members it belongs. With a few event, the households more often than not encountered in one's niche are quickly identified, but if facing specimens from different areas, particularly these from the titanic and wealthy subtropics and tropics, there's less sure bet. The pertinent literature is frequently now not available because it is frequently came upon purely in dear, infrequent or imprecise books, or journals, current basically in a couple of really expert institutes. essentially just a couple of keys to the households of flowering vegetation of the area have ever been produced, the simplest recognized of which at this time is Hutchinson's Key to the households of flowering crops (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 observe are also Davies and Cullen's The identity of flowering plant households, second ed. (1979), which, notwithstanding, offers basically 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 could be necessary in different tropical parts too.
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Extra info for Thonner’s analytical key to the families of flowering plants
179 Stipules absent. Ovule anatropous. Endosperm copious ......... 180 Stipules present. Ovule atropous. Endosperm scanty .... Platanaceae Flowers with an annular or flask-shaped disk (velum). Anthers dehiscing with valves. (Siparunaceae) . Monimiaceae Flowers without such a velum. Anthers with longitudinal slits. Monimiaceae Ovary 1-locular, sometimes incompletely so ................... 182 Ovary 2-4-locular, or nearly so ............................. 186 Ovules 2-more ............................................
150. 151. 152. 153. -Plants otherwise. Commelinaceae Leaves often thorny-dentate, stiff and leathery, if herbaceous in a single pair or whorl. Anthers with introrse to latrorse longitudinal slits. Stigmas 3 ............................................. 147 Leaves entire, not stiff and leathery, numerous. Anthers with 1, or 2, or 4 apical pores. -Flowers each with an involucre of several bracts, in spatheate capitules or spikes. Calyx and corolla contort ........................... Rapateaceae Leaves usually thorny-dentate, stiff, leathery, parallel-nerved, numerous, not in a single pair or whorl.
Flowe rs m panicles, actinomorphic. Anthers dehiscing apically. Ovary 3locular. Ovule 1 per locule, laterally attached. Stigma 1. Styles 3, elongated. Fruit a drupe. Endosperm mealy. Embryo small. (Flagella ria) . .............. Flagellariaceae Anthers dehiscing with 1 slit or pore. -Infto rescences spatheate .............. 88 Anthers usually dehiscing with 2 longitudinal slits, if with 1 slit or pore, then plants not aquatic or from marshes and either ericoid undershrubs or ovules atropous or hemitropous ..............