Okay, some of the seeds i got information elsewhere. Here's the new list:

Scarlet Milkweed
Nasturtiums
Pansy
Zinnia
Morning Glory
Poppy
Bachelor's Button
Cleome
Sunflower
Petunia
Impatien
Wee Willie
Marigold
Shasta Daisy
Columbine
Sage
Cilantro
Arugula
Basil
Chives

The warmer the storing temps are the quicker they will lose viability. If you can maybe store them in the fridge or even freezer. They can last years+ stored in a cool place.

All of your Curcurbit/melon plants will cross within half a mile. Cucumber, pumpkin, squash.

Here is a link that might help a little!!

Here is a link that might be useful: Seed Saving

I am torn between wanting pansyloverandgrower to get the right information and incurring the wrath of countrycarolyn again. But I'll risk it.

The comment about the cross pollination of Curcurbits is not accurate. Cucumbers are forms of Cucumis sativus. Melons are Cucumis melo.
Pumpkins and squashes are usually Curcurbita pepo, Curcurbita maxima, C mixta or C moschata. They cannot cross with Cucumis. ie squashes and pumpkins cannot cross with melons and cucumbers.

There is some complexity as to what extent the different Curcurbita and Cucumis species can cross with each other within the Genus. There is a table in the link.

As far as the fruit produced is concerned cross pollination will not affect it as regards appearance or eating quality. What might be affected is the next generation of offspring if you save the seed and sow it.

None of your other listed plants will cross with each other as they are all different species.

Here is a link that might be useful: Cross pollination in curcurbits

Flora, when saving seed that is all you are worried about is the next generation of seed. When I say cross pollinated that is exactly what it refers to as in next generation of seeds!! Cross pollination has nothing to do with the taste of course, and I do not believe that is what the op is asking.

This is a seed saving forum but I do appreciate you backing me up by saying that it would only effect the next generation. ;)

If you click on the link I provided you will find where I get my information. :)

I saw none that would cross-pollinate.