Stem 30-45cm or more in height with three to five ovate to lanceolate leaves. Flowers solitary or in pairs, the lip 2.5 to 4cm long, ovoid, deep to light yellow, sepals and petals greenish-yellow to purple-brown, the petals sometimes spirally twisted, fragrant. Europe and Asia, in woods and meadows on limestone. The smaller-flowered, more slender, C.c. var. parviflorum and the larger robust and hairier C.c. var. pubescens are both native to North America.