Figure 8.9 Semelparous and iteroparous yuccas. In the species Yucca whipplei, some varieties are semelparous and other varieties are iteroparous. Over its lifetime, the semelparous variety produces (a) more flowers, (b) more fruits, and (c) a higher percentage of seeds that germinate. Error bars are means ± 1 standard error.

Data from T. E. Huxman and M. E. Loik, Reproductive patterns of two varieties of Yucca whipplei (Liliaceae) with different life histories, International Journal of Plant Sciences 158 (1997): 778–784.