Fig. 1.

Floral development closely associated with the transition of thermogenic stage in skunk cabbage. (A) Variations in ambient air (Ta) and spadix (Ts) temperatures. At the immature stage (white bar), heat production has not occurred. During the female stage (red bar), spadices produce extensive heat, and maintain their internal temperature around 20 °C. At the bisexual stage (yellow bar), the spadix can produce heat, but not enough to keep a constant body temperature. At the male stage (light blue bar), spadices are no longer able to produce heat. (B) Photographs of spadices from each stage (immature (a), female (b), bisexual (c), male (d)).