Try to make your search as simple as possible:
Nicotiana will find all items including that sequence of letters.
Search results for "Nicotiana":
"Nicotiana affinis L G" - Nicotiana alata Lime Green
"Nicotiana affinis S W" - Nicotiana alata Sweet Scented White
"Nicotiana affinis Sens. M." - Nicotiana alata Sensation Mixed - Daylight Sensati
"Nicotiana arborea" - Nicotiana glauca