This section is from the book "British Wild Flowers - In Their Natural Haunts Vol2-4", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The flowers which grow in our fields and meadows are intermediate in character in many ways between (I) those which grow near (or in) water, and require moist conditions, that is, hydrophytes, and (2) those that need dry-soil conditions and grow on the highlands, that is, xero-phytes. Hence they are called mesophytes.
This group, as will be seen, also includes Woodland Plants (hylophytes), plants growing on cultivated soil, and waste-ground plants or ruderal plants.