Ref1

https://books.google.com.my/books?id=qFdB3GSLMcEC&pg=PA525&lpg=PA525&dq=Vigna+unguiculata+subsp.+sesquipedalis+harvest+days&source#v=onepage&q=Vigna%20unguiculata%20subsp.%20sesquipedalis%20harvest%20days&f=false