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EXPLANATION OF PLATE XI. 



L The Nettle Tribe. — 1. A piece of Co/wmow Pellitory (Pa- 

 rietaria officiualis). — 2. The calyx of a sterile flower, with the sta- 

 mens projecting. — 3. The same cut open. — 4. An anther. — 5. A 

 fertile flower. — 6. A pistil. — 7. An ovary cut through perpendicu- 

 larly, shewing the position of the ovule. — 8. A ripe fruit. — 9. The 

 same cut through perpendicularly, shewing the position of the 

 embryo within the albumen. — 10. An embiyo. 



n. The Willow Tribe. — 1. A catkin of sterile flowers of the 

 Monandrous Willow. — 2. A single sterile flower of the Tellmu Osier 

 (Salix vitellina), with the gland, a, at its base. — 3. The same with 

 the bract that belongs to it. — 4. A catkin of the fertile flowers of the 

 Telloio Osier. — 5. The pistil with its gland, a, and its bract, b. — 

 6. A seed-vessel ejecting the seeds. — 7. A seed with its down. — 

 8. A seed without the down. — 9. An embrj'o with the cotyledons 

 separated. 



