How many purple vegetables are there?

There are a few ways to answer that question. There are vegetables in the culinary sense and vegetables in the biological genus sense.

Here's a list generated by the Q&A community:

# potatoes

# cabbage # spinach # onion

# carrot

# celery

# squash

# collards

# radish

# pumpkin

# pepper # corn # broccoli

# peas

# cauliflower

# lettuce # beets # Brussels sprouts # eggplant # zucchini

# cucumber # Okra # asparagus # leek # artichoke # parsnip # turnip # yam # rhubarb