Three gifts are listed here, and every one of them is dead or ugly: withered flowers, butterflies trapped in a jar, and letters the speaker calls "unsightly." Nothing about them is romantic in the usual sense. Yet the speaker answers with a shrug and a surprising confession: "Who am I to reject such gifts? I love it all."
The tone is hard to pin down. It could be sincere, a person tender enough to find love in clumsy, even morbid gestures. It could also be quietly bitter, the voice of someone who accepts whatever scraps they're given. The title, "Dead Courtship," pushes toward the darker reading, suggesting a relationship that is lifeless before it properly begins. The butterflies in a jar are especially telling, since they show a love that captures and keeps things still rather than letting them live.
The mood is eerie and sad, with a flat, resigned calm. The short last line makes the speaker's devotion feel either touching or a little unsettling, and the poem leaves us to decide which.