HI Erik
These are good questions indeed! They have been lurking in my mind for some time and your post motivated me to find out,
Brassica =
.
Brassica (/ˈbræsɪkə/) is a genus of plants in the mustard family (Brassicaceae). The members of the genus are informally known as cruciferous vegetables, cabbages, or mustard plants. Crops from this genus are sometimes called cole crops—derived from the Latin caulis, denoting the stem or stalk of a plant (Wikipedia)
CABBAGE – a specific member of the brassica family,
LETTUCE/SALAD – Lettuce is a specific leafy vegetable usually used in salads. SALAD can be a generic term that includes, as well as lettuce, other leaves used in salads, including chicories, herbs, edible flowers and a whole host of other leaves. SALAD can also refer to vegetables used in salads, such as cucumber, tomatoes, etc.
CLABRESE/BROCCOLI – I too have been curious about this and apparently the two terms are generally confused. The website QUICKGROW.COM says:https://www.quickcrop.co.uk/learning/plant/brocolli-calabrese
The supermarkets have helped to confuse the issue of what is broccoli and what a calabrese by calling both by either name. The large green heads you see in the photo (and generally referred to as broccoli) is Calabrese whereas the much smaller heads which can be green, purple or white are broccoli. The flavour of calabrese is milder and much preferred by many to sprouting broccoli and it is an easier crop to grow.
Celeriac and celery are two forms of vegetable derived from the wild plant apeum graveolens. Celery is grown for its stalks and leaves; celeriac is grown for its bulbous “roots”.
Thats a start and may be a help. it was an interesting exercise for me to look into the difference.
Best wishes
Beverley