the specific name honours james edward alexander, the victorian soldier and explorer, while the generic name refers to leaves and flowers arising from below the paired, decussate, opposite spines. leaves are tufted (fascicled) or opposite, and densely tomentose and grey. they are simple and elliptic to obovate, up to 4 cm long, and with coarsely dentate or scalloped margins. the white or pink flowers, produced after rain, are about 10 cm in length, fragrant, showy or specious, 5-lobed, and with a yellow throat. inside the tube there is a broad, villous band below the origin of the filaments. the calyx is tubular with linear teeth, and slit on one side. the fruit is a flattened, woody capsule, some 10 cm long, warty and splitting or dehiscing across the flat faces into two equal parts. old fruits are pendant and produce a characteristic clicking sound in light breezes, caused by the castanet-like tapping of the two hollow parts. seeds are papery and winged.