Fig. 1

Distributions of the Maui representatives of the green ecomorph and other ecomorphs in the clade. The map shows the distributions of the three green ecomorph species based on previous literature and field observations. The three species have populations on different volcanoes as follows: T, macracantha (dark green), Kīpahulu Valley (East Maui) and Lanaʻi; T. waikamoi (light green), Upper Waikamoi (East Maui) and West Maui (Puʻu Kukui); T. brevignatha (capypso), Lower Waikamoi (East Maui) and the Big Island (Mauna Kea - Laupāhoehoe; Mauna Loa - Kīpuka, Kaʻu, Kona Hema, and Puʻu Makaʻala; and Hualālai – Honoaula; localities not shown on the figure). Circles show a reduced representation of previous collections of species within the green ecomorph, as well as those from the maroon (T. kamakou) and small brown (T. restricta) ecomorphs. Red diamonds correspond to the sites used on the current study; for more details see Additional file 1: Table S1. The cladogram indicates the phylogenetic position of species used in the current study relative to others within the spiny leg clade (based on [11, 22]), the colours again representing the ecomorph of each species (for details see [11]). Maps modified from http://www.hear.org/starr/maps/stock/ and Stamen terrain map