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2. Very small polar area (< 0.25 μm) |
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3. Endoaperture with a median constriction; continuous muri tending towards the lophate pattern; walls distributed uniformly in the apocolpus .................................................... V. crassa
3. Endoaperture without a median constriction; discontinuous wall not tending towards the lophate pattern; muri in the apocolpus only delimiting the apertures ................ V. oligolepis
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2. Small polar area (0.25-0.50 μm) |
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4. Pollen grains with IC 95% ≥ 53.9 μm, colpus > 25.0 μm long; muri very sinuous; continuous ................................................................................................................................... V. lucida
4. Pollen grains with IC 95% < 53.6 μm; colpus ≤ 24.0 μm; muri slightly sinuous; discontinuous
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5. Pollen grains with IC 95% DP = 52.7-53.6 μm; endoapertures lightly lolongate (11.8 × 11.2 μm); without a median constriction; walls in the apocolpium only delimiting the aperture ....................................................................................................... V. ignobilis
5. Pollen grains with IC 95% DP = 50.1-51.9 μm; endoaperture clearly lalongate (6.1 × 10.6 μm); with a median constriction; muri distributed uniformly in the apocolpium ......................................................................................................................... V. viscidula
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| 1. Medium sized pollen grains (25.0-50.0 μm) |
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6. Very small polar area (≤ 0,25 μm) |
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7. Endoapertures with a median constriction; colpus ca. 27.6 μm long; interspinal distance ca. 10.6 μm .......................................................................................................... V. mucronulata
7. Endoaperture without a median constriction; colpus < 26,7 μm long; interspinal distance ≤ 10,0 μm
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8. Pollen grains with IC 95% DP = 48.8-50.0 μm; muri tending towards the lophate pattern; spine > 8.0 μm long .................................................................................. V. puberula
8. Pollen grains with IC 95% DP ≤ 47.1 μm; muri not tending towards the lophate pattern; spine ≤ 6.4 μm long
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9. Pollen grains with IC 95% DP = 41.4-42.2 μm; endoapertures > 14.0 μm wide; spine < 5.5 μm long .......................................................................................... V. ferruginea
9. Pollen grains with IC 95% DP ≥ 43.8 μm; endoapertures ≤ 9.0 μm wide; spine > 6.0 μm long ................................................................................. V. paludosa, V. petiolaris
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6. Small polar area (> 0.25 μm) |
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10. Pollen grains with muri tending towards the lophate pattern |
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11. Muri slightly sinuous |
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12. DP = 40.7-41.8 μm ...................................................................... V. divaricata, V. membranacea
12. DP > 45.0 μm or < 39.7 μm
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13. Endoapertures with a median constriction; spines ≤ 5.0 μm long ..................... V. cuneifolia
13. Endoapertures without a median constriction; spines ≥ 7.5 μm long .................. V. mariana
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11. Muri very sinuous |
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14. Muri continuous; DP = 45.3-46.1 μm ............................................................... V. montevidensis
14. Muri discontinuous; DP > 47.5 μm or < 42.7 μm
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15. DP = 47.5-48.5 μm; endoapertures with a median constriction ...................... V. rigiophylla
15. DP = 41.8-42.7 μm; endoapertures without a median constriction .................. V. westiniana
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10. Pollen grains with muri slightly or very sinuous and not tending towards the lophate pattern |
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16. Muri very sinuous, continuous |
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17. DP = 43.5-44.2 μm ................................................................................................... V. brasiliana
17. DP = 48.2-49.4 μm ................................................................................................ V. chamaedrys
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16. Muri slightly sinuous discontinuous |
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18. DP = 37.3-38.2 μm; colpus ca. 20.8 μm long; spine ca. 3.8 μm long ........................ V. discolor
18. DP ≥ 44.5 μm; colpus > 24.3 μm long; spine > 7.3 μm long
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19. DP = 44.5-45.0 μm ............................................................................................. V. lindbergii
19. DP = 46.1-46.9 μm ......................................................................................... V. phosphorica
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