The world’s smallest herbaceous plant is Wolffia microscopy. Its length is 0.1 mm or 300-600 micrometers and weight is 150 micrograms. The tallest herbaceous plant is Eucalyptus marginata. Its height is 500 feet. It is found in Tasmania, Australia. The smallest herbaceous plant of Bangladesh is Wolffia arrhiza (duckweed). There are 2,87,000 species of plants in the world. However, the number of species in Bangladesh is about 5000.
Herbaceous plants are believed to have originated in the Cretaceous period 13 million years ago. The first herbaceous plants originated in tropical regions, particularly Southeast Asia. Spread in different directions within 4-5 crore years. No fossils of herbaceous plants have been found till date.