What is the meaning of 'Monham P.P. #10128' in the plant name 'Parthenocissus quinquefolia 'Monham' P.P.# 10128'? I imagine Monham is the name of the plant breeder, but what does the number designate?

Thank you, RPV

'Monham' is the cultivar name. P.P. I believe stands for patent pending, followed by the application number.

Jay is correct that 'Monham' is the cultivar name. These are correctly indicated by the single quotes. The PP means the plant is patented and the number 10128 is the patent number. If it had only been applied for it would say PPAF (Plant Patent Applied For). According to the US Patent Office online database, this plant was patented in 1997 by Monrovia. The patent can be viewed here if the link will work:

http://patft.uspto.gov/netacgi...

Thank you Horntoad and Sooby. This answers my question precisely and completely. I am grateful to you. – RPV