“The rose that all are praising
Is not the rose for me.”

To The Rose Upon The Rood Of Time http://poetry.poetryx.com/poems/1736/
The Rose (1893)
Context: Red Rose, proud Rose, sad Rose of all my days!
Come near me, while I sing the ancient ways:
Cuchulain battling with the bitter tide;
The Druid, grey, wood-nurtured, quiet-eyed,
Who cast round Fergus dreams, and ruin untold;

The "Camelot" interview (29 November 1963)

"Sacred Emily"
This statement, written in 1913 and first published in Geography and Plays, is thought to have originally been inspired by the work of the artist Sir Francis Rose; a painting of his was in her Paris drawing-room.
See also the Wikipedia article: Rose is a rose is a rose is a rose
Nigel Rees explains the phrase thus: "The poem 'Sacred Emily' by Gertrude Stein (1874-1946) is well-nigh impenetrable to the average reader but somehow it has managed to give a format phrase to the language. If something is incapable of explanation, one says, for example, 'a cloud is a cloud is a cloud.' What Stein wrote, however, is frequently misunderstood. She did not say 'A rose is a rose is a rose,' as she might well have done, but 'Rose is a rose is a rose is a rose' (i.e. no indefinite article at the start and three not two repetitions.) The Rose in question was not a flower but an allusion to the English painter, Sir Francis Rose, 'whom she and I regarded' wrote Constantine Fitzgibbon, 'as the peer of Matisse and Picasso, and whose paintings — or at least painting — hung in her Paris drawing-room while a Gauguin was relegated to the lavatory.'" - Sayings of the Century, page 91
Geography and Plays (1922)

The Little White Rose

"The Nightingale and the Rose"
The Happy Prince and Other Tales (1888)

Source: Frostbite

A White Rose, lines 1-4, in In Bohemia (1886), p. 24.

To The Rose Upon The Rood Of Time
The Rose (1893)
Context: Come near, come near, come near — Ah, leave me still
A little space for the rose-breath to fill!
Lest I no more hear common things that crave;
The weak worm hiding down in its small cave,
The field-mouse running by me in the grass,
And heavy mortal hopes that toil and pass;
But seek alone to hear the strange things said
By God to the bright hearts of those long dead,
And learn to chaunt a tongue men do not know.
Come near; I would, before my time to go,
Sing of old Eire and the ancient ways:
Red Rose, proud Rose, sad Rose of all my days.

Song Roses of Picardy http://www.firstworldwar.com/audio/rosesofpicardy.htm