"Plant Morphology in the Supermarket," by Peter Lesica and Annie Garde.
"As the temperature drops and the leaves turn brown and drop as well, it gets hard for a botanist in Montana to find anything interesting to study outside. At this time of year I go on field trips to the supermarket. In the produce section the leaves are still green, and you can always find some germinating alfalfa and mung beans.There's a lot to be learned among the aisles, but there's a distressing amount of misinformation as well. Consider this: In most stores the produce area is divided into two sections: fruits and vegetables. Right here they're leading you astray. The glossary of my botany text defines fruit as a ripened ovary containing the seeds. A vegetable is the vegetative part of the plant, not involved in reproduction. These definitions are simple and straightforward, but most supermarkets have it all screwed up."