Ceanothus greggii
It was named by Asa Gray of Harvard University in 1853 in honor of its collector , Josiah Gregg , who found the plant in 1847 at the site of the Battle of Buena Vista in the Mexican state of Coahuila during the Mexican–American War . 
<triplet> Asa Gray <subj> Harvard University <obj> employer <triplet> Battle of Buena Vista <subj> 1847 <obj> point in time <subj> Mexican–American War <obj> part of