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