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seeds. For an explanation of the characters of these, 

 I must refer you to the succeeding letter. 



EXPLANATION OF PLATE XXIL 



L The Grass Tribe. — 1. A piece of the inflorescence of Soft 

 Brome-grass (Bromus mollis) ; a a spikelets. — 2. A perpendicular 

 section of a portion of the stem, shewing the partition at a. — 3. A 

 spikelet ; a a glumes; b b b florets. — 4. A floret half open ; a the 

 lower palea ; b the upper palea ; c the beard ; d the angles of the 

 upper palea covered with stifi" hairs. — 5. A pistil ; a a hypogynous 

 scales; b stigmas. — 6. A ripe grain ; a the place where the embryo 

 lies ; b the piece which is cut out, and seen magnified at 7, where a 

 is the plumule ; b the radicle ; c the cotyledon, and d the albumen. 



IL The Sedge Tribe. — 1. A portion of the upper end of the 

 Hairy Sedge (Carex hirta) ; a a barren flower heads ; b fertile flower 

 head. — 2. A portion of the solid stem. — 3. A barren floret seen from 

 the inside, with its three stamens. — 4. A fertile floret.— 5. A ripe 

 fruit, as seen when enclosed in the bottle. — 6. The true fruit taken 

 out of the bottle. — 7 • A perpendicular section of the same, shewing 

 its erect seed a. — 8. An embrj'o. 



