A number of Aeschynanthus species, such as forms of A. pulcher have tube-like calyces. A. siphonanthus is distinguished by the lime green color of the calyx. Note the emerging buds, reminiscent of lipstick emerging from a tube — hence the common name of “Lipstick Plant” for some species of Aeschynanthus.
Another photo of a plant growing “in the wild” in Sabah, Malaysia, can be seen here.
