purple colour, render it a desirable plant for our flower 
borders. 
Descr. An erect, herbaceous, much branching plant, 
more or less downy in every part of the stem and branches. 
Leaves hairy, lanceolate or linear-lanceolate, sessile, entire 
or trifid, or sometimes, more especially below, pinnatifid. 
Flowers about the size of those of Potemonium ceruleum, 
arranged in dense, terminal, secund, circinnate racemes or 
spikes. Calyx in five, deep, linear, hairy segments. Corolla 
rotato-campanulate, veined, purple, waved at the margin. 
“a springing from the base of the corolla, Style 
ifid. 
