_V. tricolor ammotropha_ is native near
Ystad in Sweden, and the other two forms on Gotland. All three have
narrowly limited habitats.
The typical tricolored heartsease has remained annual in all its other
subspecies. It may be divided into two types in the first place, _V.
tricolor genuina_ and _V. tricolor versicolor_. Both of them have a wide
distribution and seem to be the prototypes from which the rarer forms
must have been derived. Among these latter Wittrock describes seven
local types, which [43] proved to be constant in his pedigree-cultures.
Some of them have produced other forms, related to them in the way of
varieties. They all have nearly the same general habit and do not
exhibit any marked differences in their growth, in the structure and
branching of the stems, or in the character of their foliage.
Differentiating points are to be found mainly in the colors and patterns
of the flowers. The veins, which radiate from the centre of the corolla
are branched in some and undivided in others; in one elementary species
they are wholly lacking. The purple color may be absent, leaving the
flowers of a pale or a deep yellow. Or the purple may be reddish or
bluish. Of the petals all five may have the purple hue on their tips, or
this attribute may be limited to the two upper ones.
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