This virus is ‘closely related’ to the vegetable celery by virtue of the clinical picture it produces. On X-ray images of the long bones (e.g. thigh bone and shin bone) – in virus affected individuals – the bone has alternating strips which resemble a celery stalk in appearance.
This resemblance, perhaps with an eye of faith can be seen in: Eisenberg RL, Clinical Imaging: An Atlas of Differential Diagnosis, Lippincott Williams & Wilkins, 2009 page 1080.
BONUS. More information about the devastating effects of rubella can be found here.