Interestingly enough, one of the more unusual seeds I am saving this year comes from a very common vegetable...the carrot. Your average carrot, being a biennial plant, has to be overwintered before it will produce viable seed, unless it bolts like some of my Lunar White ones did...a little too hot this summer. I held over and replanted my best carrots so they could finish their life cycle and provide us with seeds for the next generation of carrots in our garden.
After the carrot flower is pollinated by insects, it forms into a rounded umbel.
Carrot seeds, and many seeds for that matter, from one's own garden are slightly different then the ones cleaned and shipped out by the seed companies. Having flowered, the carrots spiny little seeds form atop an umbel that eventually dries at which point the seed is ready to be harvested.
The dried umbels eventually break off and blow away in the wind as a tumbleweed, dispersing seeds as they roll along.
Each individual flower produces a pair of seeds, the below carrot seeds are really two seeds slightly attached.