Their cones are composed of thin, rounded, closely imbricated scales, each with a more or less conspicuous bract springing from the base.
The cones, about the size of a small walnut, bear spirally arranged imbricated scales which subtend the three-angled winged seeds.
- Diagram to illustrate imbricated aestivation, in which the parts are arranged in a spiral cycle, following the order indicated by the figures I, 2, 3, 4, 5.
This involucre is frequently composed of several rows of leaflets, which are either of the same or of different forms and lengths, and often lie over each other in an imbricated manner.
In the artichoke the outer imbricated scales or bracts are in this condition, and it is from the membranous white scales or bracts (paleae) forming the choke attached to the edible receptacle that the flowers are produced.