Data Species | Pollen length (µm) | Pollen width (µm) | Pollen apertures (µm) | P?E ratio (µm) | Pollen form |
H. arbainense | 28 | 20 | 0.8 | 0.70 | Circular |
H. longiflorum | 20 | 11 | 0.7 | 1.81 | Circular |
H. petrocarpum | 25 | 22 | 0.5 | 1.13 | Circular |
H. strigosium | 27 | 16 | 0.3 | 1.68 | Elliptical |
H. zeylanicum | 32 | 28 | 0.4 | 1.14 | Rounded |
H. jizanense | 41 | 35 | 0.9 | 1.17 | Triangular |
H. lasiocarpum | 38 | 31 | 0.8 | 1.22 | Oval |