Here is another image of this species I've posted in the Garden Gallery.

Here is a link that might be useful: Lobelia niihauensis (Limahuli NTBG)

I've seen Clermontia(?) (haven't studied the subject in years) and Trematolobelia flowering on the ridges between Honolulu and the north side, but not this one. With the dangerous topography and large federal holdings, closed/restricted watersheds on the older islands I wonder if all the surviving populations of lobeliads etc. are actually known and assessed.

My family dates back to the 19th century in Hawaii but the last of us moved to the mainland recently so I may never be back, unless sometime I decide I need to talk to same burial markers before I die myself. The last one to end in Hawaii was laid to rest in Punchbowl cemetary, 98 years after she was born over there.