What botanical structure are the crisp, red stalks of Rhubarb recognized as being, despite culinary preparations?
Petioles.
Rhubarb presents an interesting case in botanical versus culinary classification, particularly concerning stems. While commonly prepared in sweet dishes like pies, which might suggest fruit categorization, the crisp, red, edible stalks of rhubarb are botanically defined as petioles. Petioles are specifically the shafts or stalks that connect the leaf blade to the main stem of the plant. This contrasts with true stems, which are generally responsible for vertical support and transportation of water and nutrients between the root system and photosynthetic structures. Celery is another widely consumed plant where the edible portion, often broadly called the stalk or stem in culinary terms, is technically composed of these petioles.

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