Answer: There is a plant commonly called Yesterday Today and Tomorrow (Scientific Name: Brunfelsia pauciflora var. calycina) that may be what you have.
With flowers opening purple, then turning pale lavender and finally white, yesterday-today-and-tomorrow is an aptly named little shrub. The pansy-like flowers have white throats, are about 2 in (5 cm) across and borne in profuse clusters (cymes, actually) of up to 10 blossoms, displayed all over the plant. Flowers of all three colors are present from spring through the end of summer. Yesterday-today-and-tomorrow gets 3-8 ft (0.9-2.4 m) tall with several stems, an open, airy habit, and a spread of 2-5 ft (0.6-1.5 m). The leaves are leathery and semi-evergreen, 3-6 in (8-16 cm) long, dark green above and pale beneath.
Yesterday-today-and-tomorrow does best in full sun but needs some shady protection during the heat of the day to look its best. Also does well in filtered shade.
Moisture: Water regularly and don't allow to dry out completely.
Hardiness: USDA Zones 9 - 12.
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