PORTLAND, Ore. — Most states don't recognize gay marriage — but now Hallmark does.

The nation's largest greeting card company is rolling out same-sex wedding cards — featuring two tuxedos, overlapping hearts or intertwined flowers, with best wishes inside. "Two hearts. One promise," one says.

Hallmark added the cards after California joined Massachusetts as the only U.S. states with legal gay marriage. A handful of other states have recognized same-sex civil unions.

The language inside the cards is neutral, with no mention of wedding or marriage, making them also suitable for a commitment ceremony. Hallmark says the move is a response to consumer demand, not any political pressure.

"It's our goal to be as relevant as possible to as many people as we can," Hallmark spokeswoman Sarah Gronberg Kolell said.

Hallmark's largest competitor, American Greetings Corp., has no plans to enter the market, saying its current offerings are general enough to speak to a lot of different relationships.

Hallmark started offering "coming out" cards last year, and the four designs of same-sex marriage cards are being gradually released this summer and will be widely available by next year. No sales figures were available yet.

"When I have shopped for situations like babies or weddings for gay friends I have good luck in quirky stores," said Kathryn Hamm, president of the Web site www.gayweddings.com.

"But if you are just in a generic store ... the bride and groom symbol or words are in most cards," she said. "It becomes difficult to find some that are neutral but have some style."

The Williams Institute at the UCLA School of Law estimates that more than 85,000 same-sex couples in the United States have entered into a legal relationship since 1997, when Hawai'i started offering some legal benefits to same-sex partners.

It estimates nearly 120,000 more couples will marry in California during the next three years — and that means millions of potential dollars for all sorts of wedding-industry businesses.

The Greeting Card Association, a trade group, says it does not track how many companies provide same-sex cards but believes the number is expanding.

"The fact that you have someone like Hallmark going into that niche shows it's growing and signals a trend," said Barbara Miller, a spokeswoman for the association.

Hallmark says all of its stores can choose whether they want to add the latest offerings.