The Collaborative International Dictionary
Veronica hederifolia
Winterweed \Win"ter*weed`\, n. (Bot.)
A kind of speedwell ( Veronica hederifolia) which spreads
chiefly in winter.
--Dr. Prior.
Wikipedia
Veronica hederifolia
Veronica hederifolia (Ivy-leaved Speedwell) is a flowering plant belonging to the family Plantaginaceae. It is native to Eurasia and it is present in other places as an introduced species and a common weed. It is an annual herb growing from a taproot and producing a hairy, spreading stem up to about long. The stem is lined with rounded leaves with blades which are divided shallowly into three to five lobes and borne on petioles. Solitary blue flowers occur in leaf axils, each with a corolla up to wide. The fruit is a dehiscent capsule.