Rubus palmeri

Rubus palmeri is a rare Mexican species of brambles in the rose family. It has been found only in the Sierra Madre Occidental in Chihuahua, Durango, Jalisco, Nayarit, and Sonora in western Mexico.
"Rubus palmeri" is a reclining perennial with stems up to 4 meters (13.3 feet) long, reclining on walls, rocks, or other vegetation. Stems are covered with wool and armed with curved prickles. Leaves are pinnately compound with 3 or 5 leaflets. Flowers are white. Fruits are dark purple.