Operculina, Silva Manso, 1836

Simões, A. R., Silva, H. & Silveira, P., 2011, The Convolvulaceae of Timor with special reference to East Timor, Blumea 56 (1), pp. 49-72 : 66

Key to the species of Operculina

1. Stems terete. Corolla with midpetaline bands densely sericeous-pilose outside; pale yellow or rarely white. Seeds with 2 pilose-papillose edges.............. 1. O. riedeliana

1. Stems narrowly 3 – 5-winged, sulcate or angular. Corolla glabrous or with minute yellowish glands outside; entirely white or white with yellowish base. Seeds glabrous...................................... 2. O. turpethum