Panama Red, known as Panamanian Red, or P.R. is a pure cultivar of Cannabis sativa, popular among cannabis aficionados of the 1960s and 1970s, and renowned for its potency. The typically high THC levels associated with the variety are thought to be dependent on the particular cultivar, rather than the Panamanian climate.
In a limited test, an Auburn University researcher reported that "seed of a sample of Panama Red, grown in the very different climates of the Canal Zone, campus and northern New Hampshire, yielded marijuana with similar THC content."
Its name comes from its cultivation in the country of Panama, and its claylike red color. Production was common in Panama's sparsely populated Pearl Islands.
Jalal Mansur Nuriddin aka Lightnin' Rod mentions "Panamanian Red" in his epic Hustlers Convention album. Track 5 "Coppin' some fronts for the set" and later just "red" in track 8 "The break was so loud, it hushed the crowd".