Abstract
24 trees, grown from self-pollinated seed of a carpellate individual showing sex-reversal to maleness, were studied. Of these 24 trees, 20 showed the following sex conditions at their first blooming period: 5 were pure staminate; 8 were pure carpellate; 4 were decidedly staminate but each one had some carpellate flowers; 1 was decidedly carpellate but had several catkins with some staminate flowers; and 2 were of decidedly mixed sex expression. Four trees had not bloomed when the experiment was finished. These results correspond with those previously obtained from a reversed staminate tree, whose self-pollinated seed also produced pure [male][male], pure [female][female], and individuals of mixed sex expression. The experiments show that the dioeciousness or unisexuality of M. alba is not caused by hereditary differentials but by a physico-chemical or physiological condition, since both [male] and [female] individuals are potentially bisexual.

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