Crossword clue: a plant (veronica beccabunga), with flowers, usually blue, in axillary racemes. the american species is v. americana.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac f