Which weed has palmately divided leaves into three leaflets and yellow funnel-form flowers?

Which weed has palmately divided leaves into three leaflets and yellow funnel-form flowers?

• A. Woodsorrel, yellow
• B. Spurge, prostrate
• C. Sandbur
• D. Violet

Answer: (A)

The main idea here is recognizing weeds by both leaf arrangement and flower form. A plant with leaves divided into three leaflets arranged palmately and yellow funnel-shaped flowers points to yellow woodsorrel (Oxalis species). Those trifoliate, heart‑shaped leaflets come together at a single point like a tiny hand, and the yellow flowers are distinctly five-petaled and somewhat funnel‑shaped, which is a classic sign of woodsorrel. This combination sets it apart from the others: spurge prostrate has small, inconspicuous flowers and milky sap with non‑trifoliate leaves; sandbur is a grass-like weed with burrs; violet has broader leaves and typically purple flowers. So the description matches yellow woodsorrel precisely.

The main idea here is recognizing weeds by both leaf arrangement and flower form. A plant with leaves divided into three leaflets arranged palmately and yellow funnel-shaped flowers points to yellow woodsorrel (Oxalis species). Those trifoliate, heart‑shaped leaflets come together at a single point like a tiny hand, and the yellow flowers are distinctly five-petaled and somewhat funnel‑shaped, which is a classic sign of woodsorrel. This combination sets it apart from the others: spurge prostrate has small, inconspicuous flowers and milky sap with non‑trifoliate leaves; sandbur is a grass-like weed with burrs; violet has broader leaves and typically purple flowers. So the description matches yellow woodsorrel precisely.