FIGS. 21-24. Blades of Dracontium. 21. D. gigas (Zhu 1159), showing three principal divisions. 22. D. gigas (photo by Michael Grayum), middle division of leaf blade, showing trichotomously divided pattern. 23. D. gigas (photo by Michael Grayum), lateral division of leaf blade, showing dichotomously divided pattern. 24. D. grayumianum G. Zhu (Zhu 1506), blades showing fenestrations.