Pterostylis caulescens L.O.Williams, habit, photo N.E.G. Cruttwell (10/76, PNG, Mt. Michael)
Pterostylis papuana Rolfe, plant habit, photo E.F. de Vogel, based on Stocker cult.
Pterostylis papuana Rolfe, flower, lateral view, slightly from below, photo E.F. de Vogel, based on Stocker cult.
Pterostylis papuana Rolfe, flower, view from below, photo E.F. de Vogel, based on Stocker cult.
Pterostylis papuana Rolfe, flower detail (flower cut open), photo A. Schuiteman
Pterostylis caulescens L.O.Williams, habit and floral analysis, drawing N.H.S. Howcroft 64, based on Johns coll., from Mt. Giluwe