A flower changes hands twice before the first stanza is over. Nature gives it to the speaker, and the speaker passes it on: "I send you a decrepit flower / That nature sent to me." The word "decrepit" is the first surprise. We use it for old men and tumbledown houses, not for presents, and its bluntness makes the gesture both comic and touching. The speaker doesn't dress the flower up or pretend it is fresh. It is worn out, and she or he says so, as if honesty were part of the gift.
The scene around the flower is sketched in very few strokes. Autumn is never named, yet we know it is arriving, because nature, personified as a "she," "was going south," like a bird or a traveller with a timetable. The speaker, by contrast, "designed to stay." That verb is a good choice. It means "intended," but it also hints at planning and deliberate decision, so staying behind sounds like a stance rather than a misfortune. Even so, the flower is a "souvenir" of "parting," and the poem carries a quiet sense of being left behind as the warm world leaves. Everything is implied, and not one colour or scent is described. The only image is the withered flower, and it does all the work.
The second stanza turns from the object to the giver's mind, and the mood changes. Why did nature hand over this flower? Was it "sentiment for me," real affection, or "circumstances prudential," a sensible decision that a failing bloom wasn't worth carrying south? The second reading is a small sting. A souvenir is meant to be a keepsake, but it may just be what was left over. The poem's final word on the matter is that the motive is "withheld invincibly," so it cannot be uncovered.
That last phrase shows how carefully the diction is handled. The first stanza is plain and mostly one-syllable: "send," "south," "stay." The second moves into Latinate, almost legal language. "Circumstances prudential" puts the adjective after the noun, like a clause in a contract, and "invincibly" is a word you would expect in a battle report. Applying such ceremony to the question of why a dying flower was given makes the poem gently mock-solemn. The speaker is amused by the fuss, yet the fuss is also real, because everyone wants to know whether a gift means love or mere convenience.
The form supports this. The lines run eight syllables, then six, then eight, then six, the pattern of a hymn stanza, with a steady beat you can hear in "At PARTing — SHE was GOing SOUTH." Hymns usually promise certainty, so the pattern sits in nice tension with a poem about not knowing. The rhyme is also loose. In the first stanza "me" and "stay" don't rhyme at all. The second stanza finally gets an echo, since "me" returns at the end of line six and meets "invincibly," but only softly, because the final unstressed "-bly" barely lands. The poem finds a chime at exactly the moment it admits it cannot find an answer. The repeated "me" also matters. It ends two lines, one in each stanza, and the speaker's worry throughout is what the gift says about "me."
The dashes are small marks of Dickinson's style, and here they work as pauses. One after "parting" holds the moment of leaving, as if the sentence needed a breath. The poem then ends on a dash instead of a full stop, so the question is left hanging in the air.
Dickinson is famous for short poems built on hymn stanzas, slant rhyme and dashes, and all three appear here in miniature. What makes this poem worth reading is the way it turns a trivial object into an uncomfortable question. The speaker is passing on a gift whose meaning is uncertain, and the poem suggests, though it never says, that the new recipient is in the same position as the speaker. Is the flower sent out of sentiment or out of convenience? By leaving that open, the poem makes us wonder how well we ever know why someone gives us anything.