Rzedowski, Jerzy
November 1994
Acta Botanica Mexicana;1994, Issue 29, p101
Academic Journal
Cirsium bicentenariale is described from northeastern Querétaro and probably from adjacent San Luis Potosí; the species is similar to C. anartiolepis Petrak and to C. conspicuum (Don) Sch. Bip. Another new species, C. zamoranense, a very peculiar plant, somewhat resembling C. jorullense (H.B.K.) Spreng., is described on the basis of materials collected on the higher part of Mt. Zamorano.


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