
ALT Study population, bract colour morphs, natural frequency, and spectral reflectance of Curcuma caulina. (a) Mass flowering of C. caulina at Kaas plateau, showing the sympatric occurrence of bract colour morphs in the species’ native lateritic plateau habitat. The inset map shows the geographical location of the study site in peninsular India; the Western Ghats boundary is shown. (b–d) Representative inflorescences of the three bract colour morphs: (b) green–white morph (GW; 0% red on the first lateral bract), (c) green–red morph (GR; 60% red), and (d) red–white morph (RW; 100% red). Scale bars = 2 cm. (e) Natural frequency of occurrence of the three bract colour morphs recorded from field plots. Different letters above boxplots indicate statistically significant differences among morphs. (f) Spectral reflectance profiles of the three bract colour morphs measured from the first lateral bract.

























