Sawyer & S.W.Edwards (Greene) 2007 - Sawyer JO, Edwards SW (2007) A NEW SUBSPECIES AND NEW COMBINATION IN FRANGULA PURSHIANA (RHAMNACEAE) FROM THE SIERRA NEVADA, PLUMAS COUNTY, CALIFORNIA. Madroño 54: 172-174. doi: 10.3120/0024-9637(2007)54[172:ansanc]2.0.co;2.
There is no corrections for Frangula purshiana subsp. annonifolia yet.