Prominent vegetation of various birch forests include meadowsweet, common wood sorrel, bilberry and graminoids Calamagrostis arundinacea and C. canescens.
From the en.wikipedia.org
Common or garden sorrel has arrow-shaped leaves and a more acidic flavor than French sorrel, which has broader, fleshier leaves.
From the post-gazette.com
The herb garden was designed by Martha Stewart, and here common aromatics such as lavender and thyme rub shoulders with the lesser-known Thai basil, French sorrel, and Greek oregano.