Although widely scattered across eastern states, this species seems somewhat uncommon except on the Coastal Plain from Tex. to Fla. (K, PL). It is similar to albolutescens in its obovate perigynia, but clearly a distinct species; 2n = 58 or 62. It also resembles brevior and festucacea. There has been much confusion among these taxa (FNA 23). C. longii differs from albolutescens in its straight (versus laterally sinuous) style bases, the broadly triangular (versus narrow) beaks on its appressed-ascending (versus spreading) perigynia, and its obtuse (versus acute) pistillate scales. It tends to occur in more open habitats.