OK, I have now attended my first flower-pressing group - or actually it is a crafts group that makes greeting cards (two-dimensional art work) using pressed flowers. (Everyone gathers and presses their own flowers at home, and then brings them to the group meeting.)
Originally I had thought that such a crafts-person would simply place one pressed flower, complete with its foliage, in the center of the blank card, and then do the final touches by affixing it to the card with the provided clear contact paper. "Voila."
But no, these artisans often separate the petals and then press them, so that many more varieties of artwork are possible: many more slants on composition, color combination, and contrast are presented, as was evident to me today by their cards. They also press varieties of foliage from weeds, shrubs, flowers, bouquets in-a-vase, ferns, leaves, etc.
They even gave me a huge gazania flower-head from which to remove the petals and press in my very own telephone book at home, plus a likewise dissected chrysanthemum ! Here goes!