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Asteraceae - Endemic to El Hierro Island (Canary Islands, Spain)
Shown: Detail of flower
"Sonchus is a genus of flowering plants in the daisy family Asteraceae. Most of the species are annual herbs, a few are perennial, and some (restricted to the Canary Islands) are even woody (subgenus Dendrosonchus)
"Annual herbs in the genus are known as sow thistles (less commonly hare thistles or hare lettuces). The genus is named after the Ancient Greek for such plants. All are characterized by soft, somewhat irregularly lobed leaves that clasp the stem and, at least initially, form a basal rosette. The stem contains a milky sap. Flower heads are yellow and range in size from half to one inch in diameter; the florets are all of ray type. Sow thistles are common roadside plants, and while native to Eurasia and tropical Africa, they are found almost worldwide in temperate regions. Like the true thistles, sow thistles are in the family Asteraceae.
"El Hierro, nicknamed Isla del Meridiano (the "Meridian Island"), is the smallest and farthest south and west of the Canary Islands (an Autonomous Community of Spain), in the Atlantic Ocean off the coast of Africa, with a population of 10,162 (2003)." (Wikipedia) en.wikipedia.org/wiki/El_Hierro
My additional images of S. hierrensis:
Photographed in U.C. Botanical Garden at Berkeley - Berkeley, California