in soft wide-culmed forms and in the flat-culmed spreading extreme called E. xyridiformis, E. ambigous Jernold extends south to Louisiana. The primary division of the Palustris group appears to be in size (Jachene- E. calva large Small E. palustris E. ambigues E. mamillata E. smallii E. macrostachys E. macrostachys Fig. 25 (Tuesday) Continuation of E. palustris group. No definite proper mode, except that the tubercle width does not seem to be a good character for separation of E. palustris. Too often the tubercle is wider than hips. The type of E. murphyensis does not seem well settled, although an old Jernoy specimen may perhaps be a co-type. The problem must be solved from North America, the following attributes being the most conspicuous, 1) typical E. palustris, coarse plant with large shoots M.D.-[illegible] 2) E. murphyensis northern, chiefly in western states (identity doubtful) 3) E. halepita Atlantic seaboard, Md - Mass, + N.J. 4) E. ambigous Atlantic seaboard, Mass - Ga. 5) E. macrostachys Great Plains 6) E. perlonga Pacific coast. 7) E. calva widely distributed Alleghenies 8) E. smallii Atlantic Coast plain + St. Lakes. Fig. 26 (Wednesday) Most of the Great Plains material of the Palustris now classing as E. mamillata, E. xyridiformis, E. calva, and E. palustris, I believe to be E. macrostachya Britton.