Aeschynanthus lobbianus is the classic “lipstick plant”, with the red tube emerging from the dark calyx like lipstick from a tube. Recent research, however, has suggested that most of the Aeschynanthus with the characteristic tubular calyx are best thought of as a single species, and A. pulcher is the first published name for this group. Other members of the group have similar calyces, but in a variety of colors — red, green, tan, etc. All are now A. pulcher.
Image courtesy of www.plantillustrations.org.