Synonyms
Eupatorium punctatum Mill., Gardn. Diet. ed. 8, no. 1 1. 1768.
Kleinia jorullensis HBK, Nov. Gen. & Sp. 4:156. 1820.
Porophyllum nummularium DC, Prodr. 5:649. 1836.
Porophyllum jorullcnse Cass., Diet. Sci. Nat. 43:57. 1826.
Porophyllum ervendbergii Gray, Proc. Amer. Acad. 19:35. 1883.
Porophyllum palmeri Rose, Contr. U.S. Nat. Herb. 1 :338. 1895.
Porophyllum nelsonii Robins. & Greenm., Proc. Amer. Acad. 32:32. 1896.
Porophyllum millspaughii Robins, in Millsp., Field Columb. Mus. Publ. Bot. 2:109. 1900.
Porophyllum ohlongum Rydb., N. Amer. Fl. 34:186. 1916.
Porophyllum duaricatum Rydb., N. Amer. Fl. 34:l*d. 1916.
Porophyllum pittieri Rydb., N. Amer. Fl. 34:188. 1916.
Porophyllum guatemalense Rydb., N. Amer. Fl. 34:19(1.) 1916.

Porophyllum punctatum (Mill.) 1917. is now the accepted nomenclature for this variety of pore leaf (1)

1. See Posts Porophyllum punctatum and Tepepapaloquilitl

As you can see this variety of porophyllum has had somewhat of an identity crisis. This is often the case with this particular species. Porophyllums are often confused with each other. Even the image of P.nummularium as depicted below seems to be more indicative of P.macrocephalum than it does of P.punctatum.

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P.nummularium has also been put forward as a contender for the identity of a variety of pore leaf known as pipitzca (pipitzcaquilitl) (1). I believe this to be erroneous as pipitzca is said to be a narrow leaved variety of pore leaf. The photo of P.nummularlium as shown depicts a broad leaved variety of the herb. The name pipitzcaquilitl (2) is a prehispanic word so it seems that seekers (both botanical and culinary) have yet to discover the true identity of this particular variety.

1. various others have also mentioned that P.calcicola, P.tagetoides, P.punctatum or P.obtusifolium may be the source of this plant.
2. See Post Pipitzcaquilitl