What you are asking is which plants are we actually eating the ovary of the plant, rather than the stems, roots, or leaves. Many plants (such as lettuce) still require bees in order to swap pollen so that we can collect SEEDS.

But, some of the typical garden plants that bear edible ovaries and that need a pollinator to get the job done are peppers, eggplant, cukes, squash, pumpkin, cantaloupe, strawberries, blueberries, most of the tree fruits, I think lima beans.

On a larger level, if we lose our insect pollinators for lettuce and broccoli (of which we just eat the leaves, stems, and flower buds), the seed bank will run out. You'll stop seeing little seed packs for sale.

Thanks for the reply rhizo_1. Yes this is along the lines that I am thinking too.

The bumblebees and other bugs (some wasp looking thing I've seen on the tomato flowers) seem to pick up a lot of the slack. I haven't had my usual huge crop of honeybees in my garden this year. I saw my first honeybee last weekend, and it was only the one bee, so I was concerned for plants that I don't usually see bumblebees on, thinking the honeybees would have been most necessary for those, but I've already got tomatoes, peppers and blueberries. I've seen mostly bumblebees in my squash and cucumber flowers, so I know those will be okay as well.

We still have bees here (we're out in the country a bit) but it doesn't seem like last year. I've been happy though to see some smaller native bees working alongside their bigger honeybee relatives.

Didn't do much good though. We've got a plum that was loaded with just beginning fruit, then a freak frost came along and destroyed them. :-(