Purshia

(from the article `Rosales`) ...of cinquefoil have fleshy oil-containing structures called elaiosomes on the achenes, and ants pick up these achenes and carry them back to their ...
Found on http://www.britannica.com/eb/a-z/p/135

Purshia

Purshia (bitterbrush or cliff-rose) is a small genus of 5-8 species of flowering plants in the family Rosaceae, native to western North America, where they grow in dry climates from southeast British Columbia in Canada south throughout the western United States to northern Mexico. The classification of Purshia within the Rosaceae has been unclear....
Found on http://en.wikipedia.org/wiki/Purshia
No exact match found