Which winter annual broadleaf weed is known for their early spring blooming pinkish-purple trumpet-shaped flowers clustered at the end of stems?

The identification of the winter annual broadleaf weed with early spring blooming pinkish-purple trumpet-shaped flowers pertains specifically to henbit. This plant typically emerges in the fall, continues to grow throughout the winter, and then flowers in the spring. The flowers of henbit are distinctive, appearing as small, trumpet-shaped clusters at the end of the stems. This characteristic helps to easily recognize it during its blooming period.

Gripeweed, prostate spurge, and chickweed do not exhibit these same flower structures or blooming habits. Gripeweed's flowers and growth patterns differ significantly, while prostate spurge has a distinctive growth form and different flower characteristics. Chickweed features small white flowers and a more sprawling growth habit that does not match the description of henbit. Therefore, henbit is the correct answer as it specifically matches the defining characteristics of the question regarding flowering in early spring.