1. Pectin and hemicellulose are the dominant constituents of collenchyma cell walls of dicotyledon angiosperms, which may contain as little as 20% of cellulose in Petasites.

2. 24 Of monocotyledon there are 270 species of graminaceous plants and 115 species of sedge plants, and of dicotyledon there are 212 legume plants and 54 composite plants.