The yellow nutsedge, Cyperus esculentus L. is an herbaceous species whose tubers are the edible parts. The tubers are very popular with children, and can be eaten raw, fried or after processing into a drink (Horchata). However, it does not exist in Burkina, a centralized collection and studies on the genetic variability, the socio-cultural and economic aspects of this species. In order to identify the morphotypes and to welcome the peasant knowledge on the management of the, yellow nutsedge, a prospection followed by collection of tubers were carried out in the main areas of production of this crop. A total of 22 villages in eight districts were visited and 108 accessions of tubers were collected. It emerges from this study that the cultivation is mainly practiced by women (97% of farmers). The cultivated yellow nutsedge is adapted to drought and to several types of soil. In addition, farmers classify the tubers according to their shape and size. Thus, the spherical tubers are qualified as "small tubers the non-spherical tubers as" large tubers. The number of tubers produced per foot varies from 20 to 60. Farmers use phenotypic characters, sexual dimorphism and ethnicity to name accessions for sweet peas. Vernacular names and methods of producing yellow nutsedge vary by region and ethnicity. According to the respondents, 84.34% think that the nut is of Burkinabé origin, 9.26% Ghanaian, 1.85% from Mali and 5.35% have no answers. There is great diversity in local knowledge and accessions collected in Burkina.Keywords: Ethnobotany, tubers, accessions, morphotypes.