216 POPULAR FIELD BOTANY. 
acid, and is the true Sorrel. It is frequent in meadows and 
pastures, one or two feet high, leaves oblong, and arrow- 
shaped. The flower is similar to the last species, but larger, 
and the enlarged petal (for there is one much larger than 
the rest in all the species) is heart-shaped, purplish, obtuse, 
and veined. ‘The acidity is less than in the pretty Wood 
Sorrel. Ovwalis Acetosella, mentioned in April; but young 
people like the taste, and I believe the French use it in salads. 
HEPTANDRIA. MONOGYNIA. 
COROLLIFLORZ. PRIMULACE. 
TRIENTALIS. (Cuickweep WintTER GREEN.) 
Generic Character. Calyx divided into seven. Corolla rotate, 
also in seven. Fruit fleshy, opening with five valves. 
I will mention this plant on account of its singularity, 
in being the only one in the seventh class of the Lin- 
nean System ; but it is rare, and only found in woods in the 
north of England, though abundant in Scotland. 
Trrentatis Kuropama.  Huropean Chickweed Winter 
Green. Its stems are about five or six inches high, with 
