Robust herb. Pseudobulbs to 80 cm long. Leaves to 30 cm long, to 4 cm wide. Flowers to 2.5 cm wide; spring to summer. Sepals and petals elliptic, spreading. Labellum midlobe oblong to almost round. Syn. A. gigantea Rchb. f., A. nilotica N.E. Br.
Tropical and southern Africa.
Source: (2005). Orchidaceae. In: . Horticultural Flora of South-eastern Australia. Volume 5. Flowering plants. Monocotyledons. The identification of garden and cultivated plants. University of New South Wales Press.