EXPLANATION OF THE PLATES. 
165 
Plate XI. APHANTOCHiETA EXILIS.— Page 100. 
A PLANT OF THE NATURAL SIZE. 
Fig. 1 ■ A head of flowers, moderately enlarged. 
2. Involucre and receptacle, from which the flowers have fallen, more enlarged. 
3 and 4. Scales of the involucre, equally magnified. 
5. A pistillate flower. 
6. A perfect flower. 
7. A stamen, highly magnified. 
8. Summit of the style of a pistillate flower, equally magnified. 
9. Style of a perfect flower, equally magnified. 
10. An achenium, enlarged. 
Plate XI. EVAX CAULESCENS. —Page 101. 
Fig. 1. A plant of the natural size. 
2. A head of flowers ; vertical section, enlarged. 
3. Involucre and receptacle ; more enlarged. 
4. Inside view of one of the paleae from the summit of the receptacle. 
5. A male flower. 
6. A stamen, from the same. 
7. One of the palea3 subtending the female flowers. 
8. A female flower. 
9. An achenium ; the details all magnified. 
Plate XII. LINOSYRI3 BIGELOVIL— Page 98. 
A branch of the natural size. 
Fig. 1. A flower ; enlarged. 
2. A stamen ; magnified. 
3. The style ; more magnified. 
4. An achenium, with its pappus ; enlarged. 
5. Receptacle; enlarged. 
Plate XIII. STYLOCLINE GRAPHALOIDES. —Pag e 101. 
A PLANT OF THE NATURAL SIZE. 
Involucre and receptacle. 
Receptacle, with a male flower on its summit, and its subtending palea. 
A stamen. 
One of the fertile flowers enclosed in its large palea. 
Dorsal view of a fertile palea. 
Vertical view of the same. 
Transverse section of the same ; to show the way in which the achenium is enclosed in a dorsal fold of the palea. 
A fertile flower. 
An achenium ; the details variously magnified. 
Plate XIV. QUERCUS ECHINACEA.— Page 137. 
A BRANCH OF THE NATURAL SIZE. 
Fig. 1. A leaf without serratures. 
2. An acorn ; both figures of the natural size. 
Plate XV. SYNTRICHOPAPPUS FREMONTII.— Page 106. 
AN ENTIRE PLANT OF THE NATURAL SIZE. 
Fig. 1. Involucre and receptacle. 
2. A ray flower. 
3. A disk flower. 
4. A separate stamen. 
5. Style and its branches. 
6. Portion of the syntrichous pappus. 
7. One of the leaves of the same ; highly magnified. 
Fig. 1. 
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