Maybe an Erythrina.

Thanks guys! That appears to be it and I have purchased Campanulas before and apparently my C. primulifolia that I probably purchased from Annie's Annuals/Perennials reseeded.

do NOT rototill under a tree .. EVER ... and do NOT add a blanket of good soil ... kill grass.. cover with a good mulch ... at proper depth take plant.. dig hole.. insert plant.. backfill with native soil.. [from another part of the yard if needed] never fertilize that plant individually [or the tree will come to the fert] .. and never water individually [or the tree will come take the water ... if fert is needed.. broadcast it.. same with water ... basically .. we are digging small holes.. with the least amount of root damage [a tree will respond to a severed root.. by making 100 more feeder roots, which is why no till under tree] .. and tricking the tree into not knowing you planted something under it ... or doing anything to attract its attention ... to the plant itself ... then .. all thats left .. is your attention span ... and not forgetting to take care of them.. insert finger and provide proper watering .. ALL YEAR LONG ... sharpen your shovel to aid in digging ... good luck ken

I've read that crabapple trees can be planted under, and the 20' x 25' one in our back yard has no surface roots at all after 30 yrs. The only thing I've planted under it is a Kousa 8 ft. away from its trunk and didn't run into problems digging out any underground root masses (unlike my maples, which have awful roots above & underground). There are lots of very disease-resistant varieties out now; some are dwarf like 'Camelot' (10 ft.). I understand 'Robinson' is one of the fastest growers. If you cut & paste this link, and scroll down to the chart, it gives a lot of valuable info on many of the new crabapples out there: http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/mallus_hybrids-table.html