Fig. 3. Ovule production and flower location in an inflorescence of Sagittaria trifolia with 20 flowers. The proportion of fully developed, partly developed and undeveloped ovules is shown for each flower. Five flowers (numbers 16–20) are on the lateral branch of the inflorescence. The location of the 20 female flowers is indicated on the illustration. Male flowers are located on the upper whorls of each branch.