I only use my own pictures.

Common Ivy ground cover
Common Ivy (Hedera helix)

Plant names and distribution areas

GRIN-Global Species Database

Euro+Med Plantbase

World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew

Lamium purpureum
Red Deadnettle (Lamium purpureum)

Plant descriptions and habitats

If this information cannot be based on my own observations, I use these sources:

Book: Der BLV Pflanzenführer für unterwegs (Schauer/Caspari), ISBN 978-3-8354-0685-8

Claytonia perfoliata
Indian Lettuce (Claytonia perfoliata)