Table 1.

Key to the pollen types delimited in this study.

1. Pollen tetracolporate	Blumea sinuata pollen type
–Pollen tricolporate	2
2. Pollen size small (10.51–14.86 µm × 12.01–16.37 µm), spine’s length 3.46 µm to 4.56 µm
spines number 21–28	Cythocline purpurea pollen type
–Pollen size larger (13.71–23.90 µm × 12.53–26.67 µm), spine’s length 2.31 µm to 5.75 µm, spines number 27–58	3
3. Pollen grain triangular, spines short and sparse, spine’s length 2.29–3.43 µm, spines number 20–31	Blumea densiflora pollen type
–Pollen is nearly spherical, occasionally triangular, spine length 3.0–5.2 µm	4
4. Spines number 41–49	Blumea napifolia pollen type
Spines number 23–37	5
5. Grooves of apertures are deep	Blumea virens pollen type
–Grooves of apertures are shallow	6
6. Exines with sparse interspinular microperforations	7
–Exines with dense interspinular microperforations	9
7. Spines long with an acute apex	Blumea repanda pollen type
–Spines short with a blunt apex	8. Blumea balsamifera pollen type
9. Spines long with an acute apex	Blumea clarkei pollen type
–Spines short with a blunt apex	10. Blumea aromatica pollen type