(Trematolobelia macrostachys)
Treelets 1-4 m tall Leaves- linear to oblanceolate, blades 15-36 cm long, 0.8-3.1 cm wide. Flower- calyx lobes triangular, 3-17 mm long, 1-3 mm wide; corolla various shades of pink, subbilabiate, 43-73 mm long. Trematolobelia macrostacys is the only species in the endemic genus found on multiple islands. The genus itself is thought to be the sister clade of Lobelia sect. Galeatella.