|Oxalis corniculata, a
10-30cm tall perennial herb that does sleep movements, closes its
leaves during nighttime. Stems crawl on the ground or underground to
expand and set 3 heart-shaped leaflets at the tips of long petioles.
The leaflets measure 1cm long. Flowers are yellow, approximately 8mm
in diameter. After flowers, peduncles face down and set cylindrical
capsules at the tips facing upward. The capsules split themselves
open and blow off many seeds as the capsules ripen. Bloom time: