well alrighty now . . . i think it is high time this little cutie gets identified, don't you?
it is Lotus corniculatus . . . huh? . . . more commonly known by these names : Bird's Foot Trefoil, Baby's Slippers, and even more wonderfully - Bacon and Eggs !!
it is a short perennial that grows 6"-12" high. plantings are best spaced 10"-12" apart in full sun garden beds. it is winter hardy in USDA zones 3B - 9A . . . and considered an invasive plant in several states.
This plant produces it's own nitrogen, fixing the surplus into the surrounding soil. Bees and other beneficial insects love it, too. Flowers April - September.
The name Birdsfoot Trefoil for this plant is because the group of seed pods can resemble a birds foot. Although the flowers occur in groups of about 7, not all develop seed pods and there are frequently three slender pods joined at their base, resembling a bird's foot, with three long toes.
It has lance shaped, hairy or hairless, mid-dark green leaflets borne in 5s, the upper 3 leaflets are separated from the lower 2 by short stems. Bears small, pea shaped, yellow to reddish yellow flowers which become darker with age. The seed pods are shiny, lance shaped and black when ripe.
Basically, it is cute and lovely but it has a downside if you let it grow in the wrong places. Though its nitrogen-fixing is a soil-building benefit, it can totally take over your garden bed. This European species was introduced to the U.S. and Canada for livestock forage and erosion control along roadsides - - forms dense mats choking and shading out most vegetation.
There are photos here >>> http://davesgarden.com/guides/pf/showimage/19722/ which show this beauty at work . . . Caveat emptor, people.
In addition to previously posted info - I had heard the common name "meadow vetchling," which makes sense because it is very much like the purple-flowered "crown vetch." And I say, go easy on the, well, over eager, let's say, plant species. I can't tell you how often I used them for fillers when I couldn't afford to run out and buy enough plants to fill a new garden. I had a lovely little clump of these guys coming out of a wide crack in an old patio. Believe it or not, it was darling. I also like they way they remind me of snap dragons. I love that bubbly flower shape, but I don't to annuals.