Mentions of rare plants in this PDF:
...Santa Cruz tarplant (Holocarpha macradenia; FE, CNPS List 1B.2) is known from seven (7) occurrences in...
...Santa Cruz Tarplant (Holocarpha macradenia)...
...Santa Cruz tarplant (Holocarpha macradenia) is listed as a Federal Threatened (FT), State Endangered (SE),...
...Congdon’s Tarplant (Centromadia parryi ssp. congdonii)...
...similar-appearing common tarweed (Centromadia pungens ssp. pungens) by the presence of disk pappus...
...Designation of Critical Habitat for Holocarpha macradenia. Federal Register Vol. 67, No. 200, November...

Mentions of rare plants in this PDF:
...tarplant ( Holocarpha macradenia) and Congdon’s tarplant ( Centromadia parryi ssp. congdonii ),...