Herkogamy favours cross pollination. In Pansy there is a hood covering the stigma. So how can pollen from other plants reach this stigma?

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Solution

bumble-bees (Bombus spp.) and moths of Plusia gamma were the only efficient pollinators.

the tongues of the pollinating bumble-bees are long enough to reach the nectar in the spur

and also the stigma

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Herkogamy favours cross pollination. In Pansy there is a hood covering the stigma. So how can pollen from other plants reach this stigma?

bumble-bees (Bombus spp.) and moths of Plusia gamma were the only efficient pollinators. the tongues of the pollinating bumble-bees are long enough to reach the nectar in the spur and also the stigma

bumble-bees (Bombus spp.) and moths of Plusia gamma were the only efficient pollinators.

the tongues of the pollinating bumble-bees are long enough to reach the nectar in the spur

and also the stigma