C. radice valide fibrosa, culmo basi rudimentis foliorum emortuormn dense obsito, tenerrimo, triquetro; foliis radicalibus subsetaceis, culmum subaequantibus, margine scabris, involucro diphyllo, superante spiculas 5-6 distichas, 8-10 floras, ovatas; squamis ovatis, obtusis, glabris, fusco-nigris; carina tenui, albescente-viridi, achenio oblongo.