1	"Corollas white; bracts indistinctly veined"	"Megalochlamys trinervia"
1	"Corollas blue; bracts distinctly reticukately veined"	2
2	"Lower pairs of bracts covering only a small part of the spike; corolla tubes shorter than or about as long as the lobes"	"Megalochlamys violacea"
2	"Lower pairs of bractes completey covering the spike; corolla tubes much longer than the lobes"	3
3	"Flowers in 4-6 pairs; inflorescence axes 5-15 mm long; seeds smooth and shiny"	"Megalochlamys ogadensis"
3	"Flowers in (1-)2-3 pairs; inflorescence axes about 1 mm long; seeds covered by glandular glochidiate hairs"	"Megalochlamys linifolia"