NEW YORK—Under a skylight in her tin-ceilinged loft near Union Square in Manhattan, the abstract painter Carmen Herrera, 94, nursed a flute of Champagne last week, sitting regally in the wheelchair she resents.

After six decades of very private painting, Herrera sold her first artwork five years ago, at 89. Now, at a small ceremony in her honor, she was basking in the realization that her career had finally, undeniably, taken off. As cameras flashed, she extended long, Giacomettiesque fingers to accept an art foundation's lifetime achievement award from the director of the Walker Art Center in Minneapolis.

Her good friend, the painter Tony Bechara, raised a glass. “;We have a saying in Puerto Rico,”; he said. “;The bus—la guagua—always comes for those who wait.”;

And the Cuban-born Herrera, laughing gustily, responded, “;Well, Tony, I've been at the bus stop for 94 years!”;

Since that first sale in 2004, collectors have avidly pursued Herrera, and her radiantly ascetic paintings have entered the permanent collections of institutions like the Museum of Modern Art, the Hirshhorn Museum and the Tate Modern. Last year, MoMA included her in a pantheon of Latin American artists on exhibition. And this summer, during a retrospective show in England, The Observer of London called Herrera the discovery of the decade, asking, “;How can we have missed these beautiful compositions?”;

In a word, Herrera, a nonagenarian homebound painter with arthritis, is hot. In an era when the art world idolizes, and often richly rewards, the young and the new, she embodies a different, much rarer kind of success, that of the artist long overlooked by the market, and by history, who persevered because she had no choice.

“;I do it because I have to do it; it's a compulsion that also gives me pleasure,”; she said of painting. “;I never in my life had any idea of money and I thought fame was a very vulgar thing. So I just worked and waited. And at the end of my life, I'm getting a lot of recognition, to my amazement and my pleasure, actually.”;

Julian Zugazagoitia, the director of El Museo del Barrio in East Harlem, called Herrera “;a quiet warrior of her art.”;

“;To bloom into full glory at 94—whatever Carmen Herrera's slow rise might say about the difficulties of being a woman artist, an immigrant artist or an artist ahead of her time, it is clearly a story of personal strength,”; Zugazagoitia said.

A minimalist whose canvases are geometric distillations of form and color, Herrera has slowly come to the attention of a subset of art historians over the last decade. Now she is increasingly considered an important figure by those who study her “;remarkably monumental, iconic paintings,”; said Edward J. Sullivan, a professor of art history at New York University.

“;Those of us with a passion for either geometric art or Latin American Modernist painting now realize what a pivotal role”; Herrera has played in “;the development of geometric abstraction in the Americas,”; Sullivan said.

Painting in relative solitude since the late 1930s, with only the occasional exhibition, Herrera was sustained, she said, by the unflinching support of her husband of 61 years, Jesse Loewenthal. An English teacher at Stuyvesant High School in Manhattan, Loewenthal was portrayed by the memoirist Frank McCourt, a colleague, as an Old World scholar in an “;elegant, three-piece suit, the gold watch chain looping across his waistcoat front.”;

Recognition for Herrera came a few years after her husband's death, at 98, in 2000. “;Everybody says Jesse must have orchestrated this from above,”; Herrera said, shaking her head. “;Yeah, right, Jesse on a cloud.”; She added: “;I worked really hard. Maybe it was me.”;

In a series of interviews in her sparsely but artfully furnished apartment, Herrera always offered an afternoon cocktail—“;Oh, don't be abstemious!”;—and an outpouring of stories about prerevolutionary Cuba, postwar Paris and the many artists she has known, from Wifredo Lam to Yves Klein to Barnett Newman.

“;Ah, Wifredo,”; she said, referring to Lam, the Cuban-born French painter. “;All the girls were crazy about him. When we were in Havana, my phone would begin ringing: 'Is Wifredo in town?' I mean, come on, I wasn't his social secretary.”;

But Herrera is less expansive about her own art, discussing it with a minimalism redolent of the work. “;Paintings speak for themselves,”; she said. Geometry and color have been the head and the heart of her work, she added, describing a lifelong quest to pare down her paintings to their essence, like visual haiku.

Asked how she would describe to a student a painting like “;Blanco y Verde”; (1966)—a canvas of white interrupted by an inverted green triangle—she said, “;I wouldn't have a student.”; To a sweet, inquiring child, then? “;I'd give him some candy so he'd rot his teeth.”;

When pressed about what looks to some like a sensual female shape in the painting, she said: “;Look, to me it was white, beautiful white, and then the white was shrieking for the green, and the little triangle created a force field. People see very sexy things—dirty minds!—but to me sex is sex, and triangles are triangles.”;

Born in 1915 in Havana, where her father was the founding editor of the daily newspaper El Mundo, and her mother a reporter, Herrera took art lessons as a child, attended finishing school in Paris and embarked on a Cuban university degree in architecture. In 1939, midway through her studies, she married Loewenthal and moved to New York. (They had no children.)

Although she studied at the Art Students League of New York, Herrera did not discover her artistic identity until she and her husband settled in Paris for a few years after World War II. There she joined a group of abstract artists, based at the influential Salon of New Realities, which exhibited her work along with that of Josef Albers, Jean Arp, Sonia Delaunay and others.

“;I was looking for a pictorial vocabulary and I found it there,”; she said. “;But when we moved back to New York, this type of art”;—her less-is-more formalism—“;was not acceptable. Abstract Expressionism was in fashion. I couldn't get a gallery.”;

Herrera said that she also accepted, “;as a handicap,”; the barriers she faced as a Hispanic female artist. Beyond that, though, “;her art was not easily digestible at the time,”; Zugazagoitia said. “;She was not doing Cuban landscapes or flowers of the tropics, the art you might have expected from a Cuban emigre who spent time in Paris. She was ahead of her time.”;

Over the decades, Herrera had a solo show here and there, including a couple at museums (the Alternative Museum in 1984, El Museo del Barrio in 1998). But she never sold anything, and never needed, or aggressively sought, the affirmation of the market. “;It would have been nice, but maybe corrupting,”; she said.

Bechara, who befriended her in the early 1970s and is now chairman of El Museo del Barrio, said he regularly tried to push her into the public eye, even though she “;found a kind of solace in being alone.”;

One day in 2004, Bechara attended a dinner with Frederico Seve, the owner of the Latin Collector Gallery in Manhattan, who was dealing with the withdrawal of an artist from a much-publicized show of female geometric painters. “;Tony said to me: 'Geometry and ladies? You need Carmen Herrera,' “; Seve recounted. “;And I said, 'Who the hell is Carmen Herrera?' “;

The next morning, Seve arrived at his gallery to find several paintings, just delivered, that he took to be the work of the well-known Brazilian artist Lygia Clark but were in fact by Herrera. Turning over the canvases, he saw that they predated by a decade paintings in a similar style by Clark. “;Wow, wow, wow,”; he recalled saying. “;We got a pioneer here.”;

Seve quickly called Ella Fontanals-Cisneros, a collector who has an art foundation in Miami. She bought five of Herrera's paintings. Estrellita Brodsky, another prominent collector, bought another five. Agnes Gund, president emerita of the Museum of Modern Art, also bought several, and with Bechara, donated one of Herrera's black-and-white paintings to MoMA.

The recent exhibition in England, which is now heading to Germany, came about by happenstance after a curator stumbled across Herrera's paintings on the Internet. Last week The Observer named the exhibition one of the year's 10 best, alongside a Picasso show and one devoted to the American Pop artist Ed Ruscha.

Herrera's late-in-life success has stunned her in many ways. Her larger works now sell for $30,000, and one painting commanded $44,000—sums unimaginable when she was, say, in her 80s. “;I have more money now than I ever had in my life,”; she said.

Not that she is succumbing to a life of leisure. At a long table where she peers out over East 19th Street “;like a French concierge,”; Herrera, because she must, continues to draw and paint. “;Only my love of the straight line keeps me going,”; she said.