I have the pink Justicia - it is a low shrub that thrives in my garden in a shaded area between two large camelias but with strong side light. About a metre or so high. I know of a relative"s Megaskepasma (Brazillian Red Cloak) that is 2-3 metres high and more in diameter. Large red "blossoms" cover it in season. Can be hacked hard after flowering. Based on looking, these two are not related - but I am just an amateur.