HOP CLOVER  
TRIFOLIUM  AUREUM  LEGUMINOSAE  (PEA)

ALSO CALLED: TRIFOLIUM CAMPESTRE, TRIFOLIUM AGRARIUM, GOLDEN CLOVER, AND LARGE YELLOW HOP CLOVER

PETERSON FIELD GUIDES PACIFIC STATES WILDFLOWERS  PP. 178-179

http://web.mit.edu/cfox/www/flowers/2002-06-29/10_trifolium-agrarium_Med.jpg.11.html
 
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=TRAU2

http://www.discoverlife.org/nh/tx/Plantae/Dicotyledoneae/Fabaceae/Trifolium/campestre/