Could you post a photo of the entire plant? ( separate post unless you use Photobucket.com which is free) How tall is it?

Oh, Carol, thank you so much! That was so fast, can I tell you how much I love the GardenWeb?

I grow Penstemon pinifolius 'Mersea Yellow' which stays well below a foot for me. There are delosperma which bloom yellow. Both these will do well with less water than many perennials. There are a bunch of columbine in yellow shades, and though many will be a bit taller, they are airy enough so that this may not be a problem since the foliage stays under a foot. There are several kinds of Sedum with yellow blossoms or you could try Sedum rupestre âÂÂAngelinaâ which has bright yellow green foliage in warm weather and picks up shades of orange in cold weather. Doronicum orientale Little Leo is about 1'x1' and has bright yellow daisies. A couple of other plants with daisy-like flowers include some of the shorter coreopsis such as some of the cultivars of lance leaf coreopsis (they don't all spread like the threadleaf coreopsis) and yellow gaillardias such as golden goblin. There are some shorter daylily cultivars that might fit the bill. I have one that is a yellow repeat bloomer that I don't think gets over 12 inches. It hasn't spread much either. There are several types of shorter bulbs with yellow flowers if you want the yellow season to start earlier, including crocus, danford iris, some of the shorter daffodils, and Eranthis aka winter aconite.

It's a Hoya, but which one, I don't know.