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