Fig. 1

Effects of altitude gradient on the phenotype of the seeds (a, bar = 2 mm), leaf shape (b, bar = 5 cm), stomatal size (c, bar = 4 μm), stomatal density (d, bar = 10 μm) and trichomes density (e, bar = 100 μm) in leaf epidermis of Herpetospermum pedunculosum (Ser.) Baill. The plant samples were selected from different altitude (2800 m, 3000 m, 3100 m and 3300 m), respectively. The seeds (n = 50 for each site), the leaves size (n = 20 for each site), the stomatal size (n = 50 for each site), the stomatal density (n = 50 for each site) and trichomes density (n = 50 for each site)