When the weevil punctures a square, it turns yellow and the bracts flare open.
"How to Prosper in Boll Weevil Territory"
G. H. Alford
In this species the bracts at the calyx base are small compared with those of U. europaeus, while the smaller flowers are produced during summer, and when not a bloom is to be found on its supposed parent.
"Hardy Ornamental Flowering Trees and Shrubs"
A. D. Webster