Data Species | Hair density | Hair wall | Hair vestibule | Basal form |
H. arbainense | Dense | Smooth | Hollow | Oval |
H. longiflorum | Dense | Rough | Absent | Rounded |
H. petrocarpum | Low | Smooth | Hollow | Oval |
H. strigosium | Dense | Rough | Filled | Oval |
H. zeylanicum | Low | Rough | Filled | Globose |
H. jizanense | Low | Smooth | Hollow | Circular |
H. lasiocarpum | Low | Rough | Filled | Absent |