Astragalus is common on the borders of the fields, and in some of them Ervum, lamium and Vicia.
The dead nettle (lamium) (Fig. 120, A) is a thoroughly typical example.
Our common henbit dead-nettle (lamium amplexicaule) produces cleistogamic flowers, as do also some orchids.
A very instructive case was noticed by one of us in lamium galeobdolon, or yellow Archangel.
Tufts of lamium rhomboideum grew among the loose shingle, but no other plant seemed to vegetate in such an ungenial soil.