Abstract
In only a few perennial herbs is age determination of individual plants possible. The life cycle of Corydalis intermedia and C. solida is described. Plants have an age in years identical to the number of dead sheaths outside their underground tuber. Various ways to determine age in other species are reviewed: No. of dead layers around corm: Corydalis cava; no. of dead layers around tuber: Corydalis pumila, Drosera erythrorhiza, D. bulbosa; no. of dead remains of leaves/inflorescence stalks to the side of the corm: Philydrella pygmaea; no. of collaterals in corm: Liatris aspera; no. of nodes on rootstock: Trillium erectum; and no. of bands of high and low density of leaf scars on stems: Aeonium species.
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