A. M.  Pridgeon and Chase, M. W., ?Subterranean axes in tribe Diurideae (Orchidaceae): Morphology, anatomy, and systematic significance?, American Journal of Botany, vol. 82, no. 12, pp. 1473 - 1495, 1995.

A. M.  Pridgeon and Chase, M. W., ?Subterranean axes in tribe Diurideae (Orchidaceae): Morphology, anatomy, and systematic significance?, American Journal of Botany, vol. 82, no. 12, pp. 1473 - 1495, 1995.