#9: Lettuce
In regards to beta-carotene, the kind of lettuce does matter. Dark colorful lettuces provide the most beta-carotene with Red-Leaf Lettuce providing 4495μg per 100g, Green-Leaf providing 4443μg per 100g, and Iceberg only providing 299μg per 100g.
The lettuce plant has a short stem initially (a rosette growth habit), but when it gradually blooms, the stem and branches lengthens; and produces many flower heads that look like those of dandelions, but smaller. This is referred to as bolting. When grown to eat, lettuce is harvested before it bolts. Lettuce is used as a food plant by the larvae of some Lepidoptera.
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