That plant with the yellow flowers on dark green, fern-like foliage?
Sun-loving, drought-resistant Euryops. It's also called an African Yellow Daisy, which is certianly easier to spell!
They are VERY low maintenance almost like a Marguerite Daisy. The Euryops shown in the photograph have not been pruned*, but they can be pruned to a nice round (or other), shape. They grow about 24-30 inches tall and the same width. They like a well-drained soil - usually perfect for this area. In our San Antonio, Texas garden they are perennial (unless the plant is un-sheltered and we get a nasty frost), but are grown as an annual in other winter climates.
The Euryops has a long blooming season in San Antonio. This one started blooming in March and is still going strong. It's almost September now. Get some as soon as you can and start enjoying them. The Butterflies certainly will!
*I want to note that even if you are a novice gardener, you cannot prune these incorrectly.
Just try not to take off more than 20% at a time until you get the hang of it.