28 October 2002.
Michoacán de Ocampo, Mexico
Locality: El Bosque, 8.36 Km SW of Benito Juarez, 900 m from the intersection to Minas de Tiamarano on the road Zitacuaro-CD Altamirano
Coordinates: 19.2597, -100.4706
(Map it)
Elevation: 1240m.
Environment description: Farmer's field, maize field; Benito Juarez municipality.
Comment: P. ampla was growing next to P. philadelphica. Calix shape was variable in the population
Collector(s):