Not to be semantically confused with : Violets or Dog-Violets such as Common Dog-Violet (Viola riviniana) [plants with similar names but belonging to a totally different family (Violaceae)] - which have bi-lateral (zygomorphic) symmetry rather than radial symmetry. Nor with Dame's-Violet
(Hesperis matronalis), a Cabbage Family plant.
Slight resemblance to : Water Lobelia (Lobelia dortmanna) which also grows in shallow fresh water with similar colour flowers and the same number (five) of petals, but which grows mainly north of Lancaster rather than south) and belongs to the Bellflower Family (Campanulaceae),
Superficial resemblance to :
Narrow-leaved Water-plantain (Alisma lanceolata) and to Flowering-Rush (Butomus umbellatus), aquatic plants which have similar coloured flowers but only three petals.
Uniquely identifiable characteristics
Distinguishing Feature :
The leaves resemblance those of another aquatic plant, Parrot's Feather (Myriophyllum aquaticum), but there the leaflets are not as wide.
No relation to :
Violets such as Common Dog-Violet (Viola riviniana) [plants with similar names but are in a differing family, the Violet Family Violaceae].
Genus name not to be semantically confused with that of: Houttuynia which are Chameleons.
Grows in shallow, clear and calm fresh-water such as ponds and ditches often in-accessible to close photography. Most aquatic plants have but three petals, not so Water Violet with five. Distribution mainly south of Lancaster. The only plant in the Hottonia Genus (at least in the UK). All leaves are submerged, pinnate and in whorls. The plant is up to a metre in length, or more, half under-water, rooting at the nodes, hence is able to colonize large areas, but slowly rather than rampantly. It is native to the UK.
It is Heterostylous, where the flowers, although bisexual, come in two types, thrum and pin. The pin form has a long style and short stamens, the thrum form is the reverse of that.