The name capsella signifies a little box, in allusion to the seed pods.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie
Magnus has shown that Peronospora parasitica can only infect meristematic tissues, and that when it co-exists with Cystopus on capsella, as is usually the case, it enters the latter plant by infecting the gall-like pustules of hypertrophied tissue induced by that parasite.
"Disease in Plants"
H. Marshall Ward