Dendromecon harfordii, known by the common names Channel Islands tree poppy and Harford's tree poppy, is a species of flowering plant in the poppy family.
It was formerly treated as subspecies of the related species Dendromecon rigida, and had the botanical nameDendromecon rigida subsp. harfordii.
Dendromecon harfordii is a shrub or small tree reaching heights between 2–6 metres (6.6–19.7 ft). It has thin branching stems covered sparsely in smooth-edged, oval-shaped leaves 3 to 8 centimeters long.
It bears showy flowers with four bright yellow petals each 2 or 3 centimeters long.
The fruit is a curved, cylindrical capsule over 7 centimeters in length.
