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EXPLANATION OF PLATE XVII. 



I. Composite Flowers. — 1. Half a flower-head of jFrewcAMan- 

 gold (Tagetes patula) ; a florets of the ray ; h florets of the chsk ; c 

 section of mvolu ere ; r/ receptacle; e flower-staDc. — 2. A floret of the 

 ray; a ovarj'; b pappus ; ctube, and «? blade of the corolla. — 3. Floret 

 of the disk ; a ovary; h pappus; c corolla. — 4. Cyhnder of stamens. 

 — 5. The same sht open and unrolled. — 6. Half an involucre ; a 

 the receptacle. — /. The two stigmas. — 8. A grain, ripe and crowned 

 by the pappus b. — 9. A section of a seed, shewing the embryo. 



II. The RiBGRASS Tribe. — 1. A spike of flowers oi Broad-leaved 

 Ribgrass (Plantago major). — 2. A separate flower; a the calyx; b a 

 bract; c the corolla. — 3. A section of the calyx to shew the relative 

 position of the sepals to each other; b the bract. — 4. A sepal. — .5. 

 An anther with a part of a filament. — 6. A pistil. — 7. An ovary cut 

 perpendicularly. — 8. The same divided horizontally. — 9. A ripe fruit 

 invested by its calyx. — 10. A cluster of seeds upon the receptacle, as 

 they are left when the shell of the fruit falls off'. — 11. A seed. — 12. 

 The same cut through to shew tlie embryo. 



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