" When added in front of a noun, the past participle functions as an adjective: broken window , adopted child , etc. The having in having been quickly adopted is a present participle and functions as an adjective. As for the main verb, I think you forgot to include the is that comes before a popular..
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hktrader"Native to South America, peanuts, introduced to Africa by Portuguese explorers early in the sixteenth century and having been quickly adopted into Africa's agriculture, probably because they were so similar to the Bambarra groundnut, is a popular indigenous plant."When added in front of a noun, the past part