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The wreath is probably an oversized crown and thus a symbol of saintliness and glory. Bertram S. Puckle had this to say about them:
Were we to ask the "mourner" why he purchased those wire-tortured exotics almost identical with a dozen others, which would arrive at the house of mourning at the same time, his first surprise overcome that anyone should question so universal a custom, he would probably say that he did it as a "mark of respect." Pressed a little further if his patience stood the strain (for people who are asked why they do things which they have never thought about, often seek refuge in righteous anger), he might admit that he was not sure if he had intended to please the living or honour the dead; on the whole -- since you question it -- he would be inclined to think that his intention had been to show sympathy with the relatives, since the black-bordered card supplied by the florist contained an expression of his "deep sympathy and condolences." If quite candid, he would be forced to admit it was nothing more to him than the fulfillment of a social obligation, and that the half sovereign he paid for it saved him from the mental exercise of composing a suitable letter of condolence, which would have presented many problems, ranging from a struggle with the unaccustomed use of the third person singular, to the scratching up of suitable scriptural quotations from a rusted mind."