Explain the various keys used in description of floral formula.
Answers
Explanation:
The writing of floral formula one should start from bract and bracteole then symmetry and sex of flower, calyx, corolla, androecium and gynoecium. The number of parts of each organ is indicated in figures (1, …… 4, 5) after the relevant symbol (K, C, A, G).
If the parts are free, the figure numeral is placed as such but if they are united, the numeral figure is placed inside bracket (see numerology of symbols). In bilabiate structure, the number of parts broken into two figures depending upon the number of parts in the upper and lower lip.
Adnation of members of different whorls is shown by joining the top of their symbols by a curved line image
A break in the alternation of parts of any two successive floral cycles is indicated by inserting a vertical line between the symbols of the two floral cycles. The position of ovary whether, it is superior, half inferior or inferior is shown by placing a horizontal line below in front and above the symbol of gynoecium respectively.