Fig. 2
From: Temporal changes in the Swiss flora: implications for flower-visiting insects
Changes in mean frequencies over the 20-year study period of (A) insect vs. wind-pollinated species, (B) open saucer-shaped vs. complex and wind-pollinated flower/pseudanthium types, (C) plant species utilized by different groups of flower visitors, and (D) self-compatible vs. self-incompatible plant species. Centroids are means of the 448 study sites, and brackets the 95% confidence intervals. Drawings by S. Kessler