While studying the collections of Cryptangieae (Cyperaceae) at the New York Botanical Garden, we found specimens of two undescribed species, which based on their achene morphology are assigned to the genus Cephalocarpus. We name and describe these two new species, C. insolitus and C. neblinensis, from the Guayana Highland of northern South America. Both species have three fimbriate hipoginium scales on opposite sides of the fruit and a constriction zone between the main body and the beak of the achene, as in other species of Cephalocarpus. We also provide illustrations, distribution maps and comments about the taxonomy and distribution for each species.

在研究纽约植物园的莎草科（莎草科）的收藏时，我们发现了两个未描述物种的标本，根据它们的瘦果形态将其分配给头足类。我们命名并描述了来自南美北部瓜亚纳高地的这两个新物种C. insolitus和C. neblinensis。与其他头足类一样，这两个物种在果实的相对侧都有三个纤毛的鳞状鳞茎鳞片，并且在主体和瘦果的喙之间有一个收缩区。我们还提供插图，分布图以及有关每个物种的分类和分布的注释。