Fig. 1.

Pleurograms of seeds. (A–D) Closed and open (E–H) types of pleurograms in seeds. Seeds of the genera Tamarindus (A) and Senna (B, C) are examples of the closed type (left) and seeds of the genera Leucaena (F), Parkia (G) and Albizia (H) of the open type (right). Arrows indicate the pleurogram, and asterisks indicate the ‘opening’ in open-type pleurograms. (I–K) An unusual pleurogram in seeds. Due to differential compression of seeds during maturation, the wide greenish pleurogram in Senna alata seems to be located in a different position than usual. In this seed, the pleurogram is near the hilar region. ar, areola; hr, hilar region; ra, raphe. Scale bar = 1 mm.