96 POPULAR FIELD BOTANY. 
not be forgotten; they all arise from the root, and are 
divided into three perfect, heart-shaped leaflets, which close 
one upon the other, and are extremely beautiful, of a bright 
green, and beneath rather purple. They fold up on the 
approach of night and before rain, and it may, therefore, be 
ranked as a sensitive plant, though not equalling those of 
foreign countries. ‘The flowers are very delicate, and fade 
almost as soon as gathered. ‘The petals are white, streaked 
with purple, and are handsome and large for the size of 
the plant. In Lapland it is plentiful, and makes its ap- 
pearance very early. Formerly it was used as a sauce, and 
in small quantities it is not unwholesome. The leaves have 
an agreeable acid, and I believe oxalic acid 1s produced 
from them. Salts of lemons, for removing stains in linen, 
are the crystallized juices of this little plant. The seed- 
vessel has the power of projecting its seeds, when ripe, to a 
considerable distance. It is angular, and splits down one 
side, and then pressing on the seeds sends them to a distance 
of several feet. 
Oxatis cornicuLaTa. Yellow procumbent Wood-Sorrel. 
Is found in shady waste ground, in the south of Enlgand, 
but rare. The stem is branched and lying on the ground. 
The flowers are in small umbels, and the petals yellow, so 
