Plants are in particular an interesting one because many flowering plants rely on double fertilisation

Basically a pollen grain contains two male gametes that enter the ovule. One fuses with the egg to create the embryo, and one fuses with another cell in the ovule to produce an endosperm:

(the endosperm is a nutrient-rich tissue that the embryonic plant feeds on as it develops). It's actually quite interesting because the central cell has two nuclei so the endosperm is triploid (has three sets of chromosomes) while the embryonic plant is diploid (two sets of chromosomes).
Note that the use of "male gamete" is still unavoidable here. Some plants are diocecious - only either male or female (if your holly bush doesn't produce berries, its a male) which means they only produce either male gametes or female gametes, but many are either simultaneous or sequential hermaphrodites. The language around that is also telling - a sequential hermaphrodite can be protoandrous (starts as a male and becomes female, like rosebay willowherb - when the stamens wither, the female part of the flower opens to prevent self-fertilisation, which is why the flowers appear to die up the spike) or protogynous (starts female and becomes male, like calla lillies - the "flower" is a leaf, the actual flower is a spikey bit, and the leaf unfurls when the plant begins producing male gametes). Even simultaneous hermaphrodites are capable of having "unisexual" flowers, that is male and female flowers, like cucumbers:

although some cucumbers can produce bisexual/hermaphroditic flowers or be what is termed andromonoecious, which means it produces male flowers and bisexual flowers (so it either produces male gametes, or it produces male and female gametes, but does not have any flowers that only produce female gametes). Many daisies are the opposite (they can have female flowers and hermaphroditic flowers but no male-only flowers). Most flowers are just plain bisexual, which is what most people learn about in school:
