Lewis Short
culmus (noun M) : kindr. with culmen
* A stalk, stem, esp. of grain, straw, Varr. R. R. 1, 48, 3 (Cod. Vindob. culmen); Cic. Sen. 15, 51; Verg. G. 1, 111; 1, 317 al.—Of other plants: milii, panici,Plin. 18, 7, 10, § 52: holci,id. 27, 10, 63, § 90: lilii,Stat. S. 3, 3, 128.
Charlton T. Lewis, Charles Short, A Latin Dictionary