Rucola vs. Arugula: What's the Difference?

Rucola and Arugula Definitions
Rucola
Rocket, arugula (plant Eruca sativa)
Arugula
A Mediterranean plant (Eruca vesicaria subsp. sativa) of the mustard family, having flowers with purple-veined, yellowish-white petals and pungent, edible leaves. Also called rocket2, roquette.
Arugula
One of three yellowish-flowered Mediterranean herbs of the mustard family with flavoured leaves, often eaten in salads. Has a distinct, peppery flavor:
Arugula
Eruca sativa, sometimes Eruca vesicaria subsp. sativa
Arugula
Eruca vesicaria
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Arugula
Diplotaxis tenuifolia
Arugula
An erect European annual (Eruca vesicaria sativa) of the mustard family, often grown as a salad crop to be harvested when young and tender.
Arugula
Erect European annual often grown as a salad crop to be harvested when young and tender