Aspects of floral biology and ratios of the 2 gender forms in A dracontium, the green dragon, from 2 populations in southwestern Ontario [Canada], were studied. Annual ramets, when sexual, are either male or moneocious. Monoecious plants bore on average 110 carpellate flowers, in addition to some 80 staminate flowers. Male plants produced .apprx. 133 staminate flowers. The number of anthers per male flower ranged 1-5, with a mean of 2.2. The mean number of ovules per carpellate flower was 3.7. In both populations there were 3 times as many male plants as monoecious plants. Monoecious plants were approximately twice the size of male plants. Reproductive effort (R.E.) was about 10% in both male and monoecious plants at flowering; in monoecious plants, at the time of mature fruit, R.E. was almost 20%. Within the inflorescence of monoecious plants, the organs of attraction (spathe and appendix) accounted for 39% of floral dry matter, while gynoecial-androecial dry matter at flowering accounted for 61%. In male plants the comparable values were 58% and 42%. Organs of attraction in male plants were of comparable size to those of monoecious plants. Results are discussed in terms of androdioecious and sequential andromonoecious breeding systems.