If the red hue is combined with a yellow ground-color in the
species, the variety will be yellow and the hybrid will have the red and
yellow mixture of the species as for instance, in the genus _Geum_. The
toad-flax has an orange-colored palate, and a variety occurs in which
the palate is of the same yellow tinge as the remaining parts of the
corolla. The hybrid between them is in all respects like the
parent-species.
Other instances could be given. In berries the same rule prevails. The
black nightshade has a variety with yellow berries, and the black color
returns in the hybrid. Even the foliage of some garden-plants may afford
instances, as for instance, the purplish amaranth (_Amaranthus
caudatus_). It has a green variety, but the hybrid between the two has
the red foliage of the species.
Special marks in leaves and in flowers follow the same rule. Some
varieties of the opium poppy have large black patches at the basal end
of the petals, while in others this pattern is entirely white. In
crossing two such varieties, [283] for instance, the dark "Mephisto"
with the white-hearted "Danebrog," the hybrid shows the active character
of the dark pattern.
Hairy species crossed with their smooth varieties produce hairy hybrids,
as in some wheats, in the campion (_Lychnis_), in _Biscutella_ and
others.
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