White Campion

Another plant I can't believe didn't get blogged before. The campions, Silene, are a familiar genus. Red Campion is probably best known, but White Campion, Silene latifolia, is also widespread. It can be confused with Bladder Campion and, by the sea, Sea Campion, which both have white flowers. White Campion is usually very hairy. It is also dioecious - having separate male and female plants.

Shepherd's Purse

Another annual ruderal species which is common round us in Sussex. It is appropriate to find it on the Downs, whose landscape and habitats are a direct result of sheep grazing over millennia, for it is known as Shepherd's purse, Capsella bursa-pastoris. It is a member of the mustard family, Brassiaceae and not a native but an archeophyte. 
An archeophyte is a naturalised plant introduced before 1492 (yes, Columbus and all that) whereas after that date such plants are known as neophytes. 
The reason for its common name (a direct translation of the Latin specific) is the shape of the seed pods apparently resembling the purse carried by shepherds. Which shepherds and when is hard to discover.