This study focuses on four yam cultivars belonging to the Folou or Flado farmer’s group in the Gourounsi and Lobiri national languages grown in Burkina Faso. Its objective is to describe the different yam cultivars belonging to this group. To this end, 27 qualitative variables, including ten (10) for the stems, nine (9) for the leaves, five (5) for the tubers and three (3) for the flowers, were selected to characterize the varietal group. The trial was conducted in a Fisher block design with three replications. The work was conducted during the 2019-2020 and 2020-2021 rainy seasons in the village of Onliassan, Sissili province. The study revealed that the Folou or Flado varietal group can be attached to the D. alata species and would consist of five (05) cultivars instead of three (03) previously described by farmers.

Yam is a tuber cultivated mainly in West Africa. Its culture faces biological and non-biological constraints of climatic types especially. The increasingly high temperatures as well as the bad spatio-temporal distribution accentuate the aridity of the grounds which considerably disturb the development even the production of yam. The objective of this study was to compare the morphophysiological adaptation responses of yam morphotypes subjected to water stress and to determine the portion of the seedling and the water regime suitable for a cultivation of yam in semi-arid zones. even arid. To do this, two morphotypes of yam «waogo» (Dioscorea alata) and «nyù» (D. cayenensis - D. rotundata complex) were grown in pots in real conditions. The tubers of each morphotype were divided into three portions and then subjected to three water regimes. Environmental and morphophysiological parameters were noted during the study.For all the parameters studied, the results show that the «nyù» is more tolerant of water deficit than the «waogo» with a larger root biomass and leaf area and lower transpiration. This study reveals that depending on the portion of the seed used and water regime, «nyù» and «waogo» have differentiated behaviors.