Critical Reasoning (CR) | If you want to see flowers of Tragopogen pratensis in bloom, you will

If you want to see flowers of Tragopogen pratensis in bloom, you will need to look for them before lunch because it lives up to one of its common names Jack-go-to-bed-at-noon. Whatever the weather, flowers of this common member of the dandelion family close by midday. It's one of a number of species whose floral movements can be used as a primitive clock. Scarlet pimpernel opens and closes depending on temperature and humidity change, but finally closes for the day at about 3 pm, rain or shine.
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