When the corona of red sandwort contracts, expect rain.
Sensitive Brier.
The sensitive brier closes up its leaves on the approach of rain.
Sycamore.
Sycamore tree peeling off white in the fall, indicates a cold winter.
Sunflower.
Sunflower raising its head indicates rain.
Scotch Pimpernel.
When the corona, the Scotch pimpernel, contracts, expect rain.
Speedwell.