Flower Clock.

From the Proceedings of the Athanasius Kircher Society:

Linnaeus noted in his Philosophia Botanica that if one
possessed a sufficiently large variety of aequinoctal species, it would
be possible to tell time simply by observing the daily opening and
closing of flowers. Though Linneaus seems never actually to have
planted an horologium florae, or flower clock, his plan was
taken up with great passion by many 19th-century gardeners, who often
arranged a dozen or more species in the manner of a circular clock
face. Below, the approximate opening and closing times of aequinoctal flowers that can be used in an horologium florae:

0200 – Night blooming cereus closes

0500 – Morning glories, wild roses

0600 – Spotted cat’s ear, catmint

0700 – African marigold, orange hawkweed, dandelions

0800 – Mouse-ear hawkweed, African daisies

0900 – Field marigold, gentians, prickly sowthistle closes

1000 – Helichrysum, Californium poppy, common nipplewort closes

1100 – Star of Bethlehem

1200 – Passion flower, goatsbeard, morning glory closes

1300 – Chiding pink closes

1400 – Scarlet pimpernel closes

1500 – Hawkbit closes

1600 – ‘Four o’clock’ plant opens, small bindweed closes, Californian poppy closes

1700 – White waterlily closes

1800 – Evening primrose, moonflower


2000 – Daylilies and dandelions close

2100 – Flowering tobacco

2200 – Night blooming cereus

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