Title: Sunflowers (Van Gogh series)
Content:  Sunflowers (original title, in French: Tournesols) is the title of two series of still life paintings by the Dutch painter Vincent van Gogh. The first series, executed in Paris in 1887, depicts the flowers lying on the ground, while the second set, made a year later in Arles, shows a bouquet of sunflowers in a vase. In the artist's mind both sets were linked by the name of his friend Paul Gauguin, who acquired two of the Paris versions. About eight months later van Gogh hoped to welcome and to impress Gauguin again with Sunflowers, now part of the painted Décoration for the Yellow House that he prepared for the guestroom of his home in Arles, where Gauguin was supposed to stay. After Gauguin's departure, van Gogh imagined the two major versions as wings of the Berceuse Triptych, and finally he included them in his Les XX in Bruxelles exhibit.
Title: Sunflowers (Van Gogh series)
Content:  made with me, he can take back his little Martinique canvas, and his self-portrait sent me from Brittany, at the same time giving me back both my portrait and the two sunflower canvases which he has taken to Paris. So if he ever broaches this subject again, I've told you just how matters stand." The two Sunflowers in question show two buttons each; one of them was preceded by a small study, and a fourth large canvas combines both compositions. These were Van Gogh's first paintings with "nothing but sunflowers"—yet, he had already included sunflowers in still life and landscape earlier.
Title: Sunflowers (Van Gogh series)
Content:  None meets the descriptions supplied by van Gogh himself in his announcement of the series in every detail. The first version differs in size, is painted on a size 20 canvas—not on a size 15 canvas as indicated —and all the others differ in the number of flowers depicted from van Gogh's announcement. The second was evidently enlarged and the initial composition altered by insertion of the two flowers lying in the foreground, center and right. Neither the third nor the fourth shows the dozen or 14 flowers indicated by the artist, but more—fifteen or sixteen. These alterations are executed wet-in-wet and therefore considered genuine rework—even the more so as they are copied to the repetitions of January 1889; there is no longer a trace of later alterations, at least in this aspect.
Title: Sunflowers (Van Gogh series)
Content:  Van Gogh began painting in late summer 1888 and continued into the following year. One went to decorate his friend Paul Gauguin's bedroom. The paintings show sunflowers in all stages of life, from full bloom to withering. The paintings were considered innovative for their use of the yellow spectrum, partly because newly invented pigments made new colours possible. In a letter to Theo, Vincent wrote: "It's a type of painting that changes its aspect a little, which grows in richness the more you look at it. Besides, you know that Gauguin likes them extraordinarily. He said to me about them, among other things:‘that — ... that's... the flower’. You know that Jeannin has the peony, Quost has the hollyhock, but I have the sunflower, in a way."
Title: The Painter of Sunflowers
Content:  The Painter of Sunflowers (in French: Le Peintre de Tournesols) is a portrait of Vincent van Gogh by Paul Gauguin in December 1888. The painting is exhibited at the Van Gogh Museum in Amsterdam.
Title: Vincent van Gogh
Content:  Van Gogh painted several landscapes with flowers, including roses, lilacs, irises, and sunflowers. Some reflect his interests in the language of colour, and also in Japanese ukiyo-e. There are two series of dying sunflowers. The first was painted in Paris in 1887 and shows flowers lying on the ground. The second set was completed a year later in Arles and is of bouquets in a vase positioned in early morning light. Both are built from thickly layered paintwork, which, according to the London National Gallery, evoke the "texture of the seed-heads". In these series, Van Gogh was not preoccupied by his usual interest in filling his paintings with subjectivity and emotion; rather, 
Title: Still life paintings by Vincent van Gogh (Paris)
Content:  Two Cut Sunflowers (F375) is one of a sequence of four paintings that Van Gogh made in the summer of 1887. The first (Van Gogh Museum, F377) was a preparatory sketch. Paul Gauguin had the second and third Two Cut Sunflower paintings (F375, F376) and hung them proudly in his Paris apartment above his bed. In the mid-1890s he sold them to fund his trip to the South Seas. The image of the four sunflowers was made on a large canvas.
Title: Sunflowers (Van Gogh series)
Content:  In a letter to Theo, dating from 21 or 22 August 1888, Vincent wrote: "I'm painting with the gusto of a Marseillais eating bouillabaisse, which won’t surprise you when it's a question of painting large sunflowers." At this time he had three paintings on the go, and intended to do more; as he explained to his brother: "in the hope of living in a studio of our own with Gauguin, I'd like to do a decoration for the studio. Nothing but large sunflowers". Leaving aside the first two versions, all Arlesian Sunflowers are painted on size 30 canvases.
Title: Vase with Poppies
Content:  Flowers were the subject of many of van Gogh's paintings in Paris, and one of his many interests due in great part to his regard for flowers. As he said to his brothers Theo Van Gogh and Cor Van Gogh, "You will see that by making a habit of looking at Japanese pictures you will come to love to make up bouquets and do things with flowers all the more." To his sister, Wil, van Gogh advised her to cultivate her own garden, like Voltaire's Candide, to find joy and meaning in life. After he left Paris and settled in Arles, van Gogh painted his second group of Sunflowers in 1888 and 1889. His paintings of sunflowers in vases are among his most well known paintings.
Title: Sunflowers (Van Gogh series)
Content:  In January 1889, when Vincent had just finished the first repetitions of the Berceuse and the Sunflowers pendants, he told Theo: "I picture to myself these same canvases between those of the sunflowers, which would thus form torches or candelabra beside them, the same size, and so the whole would be composed of seven or nine canvases." A definite hint for the arrangement of the triptych is supplied by Van Gogh's sketch in a letter of July 1889. Later that year, Vincent selected both versions for his display at Les XX, 1890.

Question: how many paintings of sunflowers did van gogh paint?
Answer: two.