After his retirement, C. Raunkiær made numerical studies of plants and flora in the literature ("The flora and the heathland poets", "The dandelion in Danish poetry", "Plants in the psalms").
Sau khi nghỉ hưu, C. Raunkiær viết một số tác phẩm văn học về thực vật ("The flora and the heathland poets", "The dandelion in Danish poetry", "Plants in the psalms").