Abstract in English:

The flowering habits and the fructification of cassava M. utilissima Pohl were described. Attention was called to the small production of flowers per plant and to the attack of male flowers by the fly Teleocoma crassipes Aldrich and of the fruit by the fly Anastrepha pickeli C. Lima. The difficulties of controlled pollination were emphasized and a practical method of obtaining F² seeds were discussed.

Abstract in English:

The inheritance of two characters in Manihot utilissima Pohl were studied. It was found that the leaves with narrow lobes V (Fig. 1) are dominant over leaves with large lobes v (Fig. 2) and that the brown coloration of the roots M (Fig. 5) is dominant over white m (Fig. 6). These two characters segregate independently, according to the dates recorded in tables III and IV. The phenotypic expression of the form of the leaves is largely dependent from the environment, the leaves with narrow lobes being replaced by leaves with large lobes in plants transported to a shady place under big trees. (Figs. 3 and 4). Thus reduction of light causes a change of dominance.