The name lace-caps is a little vague, but it may be hydrangeas:
Hydrangeas
(Hydrangea macrophylla)
are large shrubs from three to six feet tall
and three to five feet wide. They produce clusters of white, pink or blue
flowers, their color depending on the acidic level of the soil.
Hydrangea macrophylla fall into two groups: mop
heads with big round, dense balls of showy, sterile flowers and flat lace caps
with an outer circle of showy, sterile flowers surrounding a center of tight,
bud-like flowers. Lace caps are more subtle than blatant mop heads, but both
have their uses. One delivers an explosion of color and the other elegance,
particularly those lace caps with variegated foliage which work wonders in a
dark area.