On the Presence of Pipitzahoic Acid in the Perezias Found in the Territory of the United States,

Botanical name: 
Acourtia
Acourtia alamanii
Acourtia carpholepis
Acourtia coulteri
Acourtia dugesii
Acourtia formosa
Acourtia fruticosa
Acourtia hebeclada
Acourtia microcephala
Acourtia moschata
Acourtia nana
Acourtia nudicaulis
Acourtia oxylepis
Acourtia parryi
Acourtia patens
Acourtia platyphylla
Acourtia reticulata
Acourtia rigida
Acourtia runcinata
Acourtia seemannii
Acourtia thurberi
Acourtia thyrsoidea
Acourtia turbinata
Acourtia wislizeni
Acourtia wrightii

Classic texts: Journals: AJP 1884.

Acourtia rigida DC.
Bot. syn.: Acourtia formosa Hook & Arn., Perezia rigida (DC.) A. Gray.