The flower and seed pod of the Devil's Claw plant, also known as the Desert Unicorn Plant, and here on San Pedrito Beach in Baja California as Espuela del Diablo (Devil's Spur}.
Plantarum indigenarum et exoticarum icones ad vivum coloratae, oder, Sammlung nach der Natur gemalter Abbildungen inn- und ausländlischer Pflanzen, für Liebhaber und Beflissene der Botanik /.
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biodiversitylibrary.org/page/44261743
Illustrationes florae novae hollandiae, sive icones generum quae in prodromo florae novae hollandiae et insulae van diemen descripsit robertus brown.
Londini :Veneunt apud auctorem,1813.
biodiversitylibrary.org/page/50449728