If you look closely at a head of broccoli you will find smaller stems that resemble the full sized broccoli head.
http://www.istockphoto.com/file_thumbview_approve/4265787/2/istockphoto_4265787-two-broccoli-florets.jpg
5 broccoli florets is equal to 1/2 a cup. So that means that 20 broccoli florets is equal to 2 cups.
florets
Florets are small flowers on the stems of certain vegetables. Broccoli and cauliflower for example, have florets at the top of their stems.
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Broccoli
The entire plant is broccoli. The part you like to eat is 'florets'
You could say that the florets are healthier than the stems. Broccoli is high in minerals and vitamins such as beta carotene, calcium, iron, thiamin, riboflavin, niacin, and vitamin C. But there is more beta carotene in the florets than there is in the rest of the plant. And the darker the green color of the florets, the higher the beta carotene and vitamin C content. Although raw broccoli is healthy, cooking releases more of the nutrients.
BROCCOLI : a green vegetable with edible leaves and "flower" heads (florets).
Chinese broccoli is a more leafy vegetable with less (or none) of the florets that we generally consider characteristic of "regular" broccoli.
To freeze broccoli and cauliflower effectively, start by washing and cutting them into small florets. Blanch the florets in boiling water for a few minutes, then quickly cool them in ice water. Drain the florets thoroughly and place them in airtight containers or freezer bags. Label the containers with the date and store them in the freezer for up to 12 months.
Broccoli is fine for Passover. However, some groups do not allow broccoli year round because of the difficulty of making sure there are no bugs in the florets. There are brands of hechshered frozen broccoli on the market though.
The florets are genrally eaten, but i also use the stalks pureed in soup.