Isochilus R.Br.

Caespitose, epiphytic herbs with slender stems and distichous. leaves. Inflorescence a terminal, often unilateral raceme. Sepals sub-equal, free or, connate into a short tube at the base, sometimes more or less subsaccate at the base. Petals about as long as the sepals. Lip subequal to the petals, simple, adnate to the base of the column or column-foot, often semi-terete, wingless; column-foot very short and inconspicuous; pollinia 4, ceraceous, elongated and laterally compressed.